Combine thermal runaway and watch-period

- Make thermal protection for all hotends and/or bed into simple
switches
- Now enable `WATCH_TEMP_PERIOD` when `THERMAL_PROTECTION_HOTENDS` is
enabled
- Move detailed thermal parameters to `Configuration_adv.h`
- Add sanity checks to warn about old configurations
- Change `WATCH_TEMP_PERIOD` to seconds instead of milliseconds

Marlin/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
-
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   #endif
 #endif
 
-
-//automatic temperature: The hot end target temperature is calculated by all the buffered lines of gcode.
-//The maximum buffered steps/sec of the extruder motor are called "se".
-//You enter the autotemp mode by a M109 S<mintemp> B<maxtemp> F<factor>
-// the target temperature is set to mintemp+factor*se[steps/sec] and limited by mintemp and maxtemp
-// you exit the value by any M109 without F*
-// Also, if the temperature is set to a value <mintemp, it is not changed by autotemp.
-// on an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #define AUTOTEMP
 #ifdef AUTOTEMP
   #define AUTOTEMP_OLDWEIGHT 0.98

Marlin/Marlin_main.cpp

         setTargetHotend1(temp == 0.0 ? 0.0 : temp + duplicate_extruder_temp_offset);
     #endif
 
-    #ifdef WATCH_TEMP_PERIOD
+    #ifdef THERMAL_PROTECTION_HOTENDS
       start_watching_heater(target_extruder);
     #endif
   }
     if (code_seen('B')) autotemp_max = code_value();
   #endif
 
-  #ifdef WATCH_TEMP_PERIOD
+  #ifdef THERMAL_PROTECTION_HOTENDS
     start_watching_heater(target_extruder);
   #endif
 

Marlin/SanityCheck.h

     #error [XYZ]_HOME_RETRACT_MM settings have been renamed [XYZ]_HOME_BUMP_MM
   #endif
 
+  #if WATCH_TEMP_PERIOD > 500
+    #error WATCH_TEMP_PERIOD now uses seconds instead of milliseconds
+  #endif
+
+  #if !defined(THERMAL_PROTECTION_HOTENDS) && (defined(WATCH_TEMP_PERIOD) || defined(THERMAL_PROTECTION_PERIOD))
+    #error Thermal Runaway Protection for hotends must now be enabled with THERMAL_PROTECTION_HOTENDS
+  #endif
+
+  #if !defined(THERMAL_PROTECTION_BED) && defined(THERMAL_PROTECTION_BED_PERIOD)
+    #error Thermal Runaway Protection for the bed must now be enabled with THERMAL_PROTECTION_BED
+  #error
+
 #endif //SANITYCHECK_H

Marlin/configurator/config/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/configurator/config/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/Felix/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/Felix/Configuration_DUAL.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/Felix/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/Hephestos/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/Hephestos/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/K8200/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/K8200/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

                                   // is more then PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term
   #define K1 0.95 //smoothing factor within the PID
-  #define PID_dT ((16.0 * 8.0)/(F_CPU / 64.0 / 256.0)) //sampling period of the temperature routine
-  
+
 // If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it
 // Ultimaker
     #define  DEFAULT_Kp 22.2
 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
 //===========================================================================
-//============================= Thermal Runaway Protection ==================
+//======================== Thermal Runaway Protection =======================
 //===========================================================================
-/*
-This is a feature to protect your printer from burn up in flames if it has
-a thermistor coming off place (this happened to a friend of mine recently and
-motivated me writing this feature).
-
-The issue: If a thermistor come off, it will read a lower temperature than actual.
-The system will turn the heater on forever, burning up the filament and anything
-else around.
-
-After the temperature reaches the target for the first time, this feature will
-start measuring for how long the current temperature stays below the target
-minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
-
-If it stays longer than _PERIOD, it means the thermistor temperature
-cannot catch up with the target, so something *may be* wrong. Then, to be on the
-safe side, the system will he halt.
-
-Bear in mind the count down will just start AFTER the first time the
-thermistor temperature is over the target, so you will have no problem if
-your extruder heater takes 2 minutes to hit the target on heating.
-
-*/
-// If you want to enable this feature for all your extruder heaters,
-// uncomment the 2 defines below:
-
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
 
-// If you want to enable this feature for your bed heater,
-// uncomment the 2 defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+/**
+ * Thermal Runaway Protection protects your printer from damage and fire if a
+ * thermistor falls out or temperature sensors fail in any way.
+ *
+ * The issue: If a thermistor falls out or a temperature sensor fails,
+ * Marlin can no longer sense the actual temperature. Since a disconnected
+ * thermistor reads as a low temperature, the firmware will keep the heater on.
+ *
+ * The solution: Once the temperature reaches the target, start observing.
+ * If the temperature stays too far below the target (hysteresis) for too long,
+ * the firmware will halt as a safety precaution.
+ */
 
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================
 #define Z_MAX_POS 200
 
 //===========================================================================
-//============================= Filament Runout Sensor ======================
+//========================= Filament Runout Sensor ==========================
 //===========================================================================
 //#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
                                  // In RAMPS uses servo pin 2. Can be changed in pins file. For other boards pin definition should be made.
                                  // It is assumed that when logic high = filament available
                                  //                    when logic  low = filament ran out
-//const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
-//#define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
+#ifdef FILAMENT_RUNOUT_SENSOR
+  const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
+  #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
+  #define FILAMENT_RUNOUT_SCRIPT "M600"
+#endif 
 
 //===========================================================================
-//============================ Mesh Bed Leveling ============================
+//=========================== Manual Bed Leveling ===========================
 //===========================================================================
 
 // #define MANUAL_BED_LEVELING  // Add display menu option for bed leveling
 #endif  // MESH_BED_LEVELING
 
 //===========================================================================
-//============================= Bed Auto Leveling ===========================
+//============================ Bed Auto Leveling ============================
 //===========================================================================
 
 // @section bedlevel

Marlin/example_configurations/SCARA/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/SCARA/Configuration_adv.h

 #define BED_CHECK_INTERVAL 3000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/WITBOX/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/WITBOX/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/delta/biv2.5/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 120 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 4 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 120   // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 4 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/delta/generic/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/delta/generic/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/delta/kossel_mini/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/makibox/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/makibox/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/example_configurations/tvrrug/Round2/Configuration.h

  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
-// Parameters for all extruder heaters
-#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
-
-// To enable for the bed heater, uncomment the two defines below:
-
-// Parameters for the bed heater
-#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 // in seconds
-#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+#define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
+#define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

 #define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
 
 /**
- * Heating Sanity Check
- *
- * Whenever an M104 or M109 increases the target temperature this will wait for WATCH_TEMP_PERIOD milliseconds,
- * and if the temperature hasn't increased by WATCH_TEMP_INCREASE degrees, the machine is halted, requiring a
- * hard reset. This test restarts with any M104/M109, but only if the current temperature is below the target
- * by at least 2 * WATCH_TEMP_INCREASE degrees celsius.
+ * Thermal Protection parameters
  */
-#define WATCH_TEMP_PERIOD 16000 // 16 seconds
-#define WATCH_TEMP_INCREASE 4  // Heat up at least 4 degrees in 16 seconds
+#ifdef THERMAL_PROTECTION_HOTENDS
+  #define THERMAL_PROTECTION_PERIOD 40        // Seconds
+  #define THERMAL_PROTECTION_HYSTERESIS 4     // Degrees Celsius
+
+  /**
+   * Whenever an M104 or M109 increases the target temperature the firmware will wait for the
+   * WATCH_TEMP_PERIOD to transpire, and if the temperature hasn't increased by WATCH_TEMP_INCREASE
+   * degrees, the machine is halted, requiring a hard reset. This test restarts with any M104/M109,
+   * but only if the current temperature is below the target by at least 2 * WATCH_TEMP_INCREASE degrees.
+   */
+  #define WATCH_TEMP_PERIOD 16                        // Seconds
+  #define WATCH_TEMP_INCREASE 4                       // Degrees Celsius
+#endif
+
+#ifdef THERMAL_PROTECTION_BED
+  #define THERMAL_PROTECTION_BED_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_BED_HYSTERESIS 2 // Degrees Celsius
+#endif
 
+/**
+ * Automatic Temperature:
+ * The hotend target temperature is calculated by all the buffered lines of gcode.
+ * The maximum buffered steps/sec of the extruder motor is called "se".
+ * Start autotemp mode with M109 S<mintemp> B<maxtemp> F<factor>
+ * The target temperature is set to mintemp+factor*se[steps/sec] and is limited by
+ * mintemp and maxtemp. Turn this off by excuting M109 without F*
+ * Also, if the temperature is set to a value below mintemp, it will not be changed by autotemp.
+ * On an Ultimaker, some initial testing worked with M109 S215 B260 F1 in the start.gcode
+ */
 #ifdef PIDTEMP
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/temperature.cpp

   int current_raw_filwidth = 0;  //Holds measured filament diameter - one extruder only
 #endif  
 
-#define HAS_HEATER_THERMAL_PROTECTION (defined(THERMAL_RUNAWAY_PROTECTION_PERIOD) && THERMAL_RUNAWAY_PROTECTION_PERIOD > 0)
-#define HAS_BED_THERMAL_PROTECTION (defined(THERMAL_RUNAWAY_PROTECTION_BED_PERIOD) && THERMAL_RUNAWAY_PROTECTION_BED_PERIOD > 0 && TEMP_SENSOR_BED != 0)
-#if HAS_HEATER_THERMAL_PROTECTION || HAS_BED_THERMAL_PROTECTION
+#if THERMAL_PROTECTION_HOTENDS || THERMAL_PROTECTION_BED
   enum TRState { TRReset, TRInactive, TRFirstHeating, TRStable, TRRunaway };
   void thermal_runaway_protection(TRState *state, millis_t *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc);
-  #if HAS_HEATER_THERMAL_PROTECTION
+  #if THERMAL_PROTECTION_HOTENDS
     static TRState thermal_runaway_state_machine[4] = { TRReset, TRReset, TRReset, TRReset };
     static millis_t thermal_runaway_timer[4]; // = {0,0,0,0};
   #endif
-  #if HAS_BED_THERMAL_PROTECTION
+  #if THERMAL_PROTECTION_BED
     static TRState thermal_runaway_bed_state_machine = TRReset;
     static millis_t thermal_runaway_bed_timer;
   #endif
 static float analog2tempBed(int raw);
 static void updateTemperaturesFromRawValues();
 
-#ifdef WATCH_TEMP_PERIOD
+#ifdef THERMAL_PROTECTION_HOTENDS
   int watch_target_temp[EXTRUDERS] = { 0 };
   millis_t watch_heater_next_ms[EXTRUDERS] = { 0 };
 #endif
     if (ct < max(HEATER_0_MINTEMP, 0.01)) min_temp_error(0);
   #endif
 
-  #if defined(WATCH_TEMP_PERIOD) || !defined(PIDTEMPBED) || HAS_AUTO_FAN
+  #if defined(THERMAL_PROTECTION_HOTENDS) || !defined(PIDTEMPBED) || HAS_AUTO_FAN
     millis_t ms = millis();
   #endif
 
   // Loop through all extruders
   for (int e = 0; e < EXTRUDERS; e++) {
 
-    #if HAS_HEATER_THERMAL_PROTECTION
-      thermal_runaway_protection(&thermal_runaway_state_machine[e], &thermal_runaway_timer[e], current_temperature[e], target_temperature[e], e, THERMAL_RUNAWAY_PROTECTION_PERIOD, THERMAL_RUNAWAY_PROTECTION_HYSTERESIS);
+    #if THERMAL_PROTECTION_HOTENDS
+      thermal_runaway_protection(&thermal_runaway_state_machine[e], &thermal_runaway_timer[e], current_temperature[e], target_temperature[e], e, THERMAL_PROTECTION_PERIOD, THERMAL_PROTECTION_HYSTERESIS);
     #endif
 
     float pid_output = get_pid_output(e);
     soft_pwm[e] = current_temperature[e] > minttemp[e] && current_temperature[e] < maxttemp[e] ? (int)pid_output >> 1 : 0;
 
     // Check if the temperature is failing to increase
-    #ifdef WATCH_TEMP_PERIOD
+    #ifdef THERMAL_PROTECTION_HOTENDS
       // Is it time to check this extruder's heater?
       if (watch_heater_next_ms[e] && ms > watch_heater_next_ms[e]) {
         // Has it failed to increase enough?
           watch_heater_next_ms[e] = 0;
         }
       }
-    #endif // WATCH_TEMP_PERIOD
+    #endif // THERMAL_PROTECTION_HOTENDS
 
     #ifdef TEMP_SENSOR_1_AS_REDUNDANT
       if (fabs(current_temperature[0] - redundant_temperature) > MAX_REDUNDANT_TEMP_SENSOR_DIFF) {
 
   #if TEMP_SENSOR_BED != 0
   
-    #if HAS_BED_THERMAL_PROTECTION
-      thermal_runaway_protection(&thermal_runaway_bed_state_machine, &thermal_runaway_bed_timer, current_temperature_bed, target_temperature_bed, -1, THERMAL_RUNAWAY_PROTECTION_BED_PERIOD, THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS);
+    #if THERMAL_PROTECTION_BED
+      thermal_runaway_protection(&thermal_runaway_bed_state_machine, &thermal_runaway_bed_timer, current_temperature_bed, target_temperature_bed, -1, THERMAL_PROTECTION_BED_PERIOD, THERMAL_PROTECTION_BED_HYSTERESIS);
     #endif
 
     #ifdef PIDTEMPBED
   #endif //BED_MAXTEMP
 }
 
-#ifdef WATCH_TEMP_PERIOD
+#ifdef THERMAL_PROTECTION_HOTENDS
   /**
    * Start Heating Sanity Check for hotends that are below
    * their target temperature by a configurable margin.
    * This is called when the temperature is set. (M104, M109)
    */
   void start_watching_heater(int e) {
-    millis_t ms = millis() + WATCH_TEMP_PERIOD;
+    millis_t ms = millis() + WATCH_TEMP_PERIOD * 1000;
     if (degHotend(e) < degTargetHotend(e) - (WATCH_TEMP_INCREASE * 2)) {
       watch_target_temp[e] = degHotend(e) + WATCH_TEMP_INCREASE;
       watch_heater_next_ms[e] = ms;
   }
 #endif
 
-#if HAS_HEATER_THERMAL_PROTECTION || HAS_BED_THERMAL_PROTECTION
+#if THERMAL_PROTECTION_HOTENDS || THERMAL_PROTECTION_BED
 
   void thermal_runaway_protection(TRState *state, millis_t *timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc) {
 
     }
   }
 
-#endif // HAS_HEATER_THERMAL_PROTECTION || HAS_BED_THERMAL_PROTECTION
+#endif // THERMAL_PROTECTION_HOTENDS || THERMAL_PROTECTION_BED
 
 void disable_all_heaters() {
   for (int i=0; i<EXTRUDERS; i++) setTargetHotend(0, i);

Marlin/temperature.h

 void setExtruderAutoFanState(int pin, bool state);
 void checkExtruderAutoFans();
 
-#ifdef WATCH_TEMP_PERIOD
+#ifdef THERMAL_PROTECTION_HOTENDS
   void start_watching_heater(int e=0);
 #endif