Redundant Power control with EDM - First Pass

Marlin/Configuration.h

@@ -392,7 +392,7 @@
  * Enable and connect the power supply to the PS_ON_PIN.
  * Specify whether the power supply is active HIGH or active LOW.
  */
-//#define PSU_CONTROL
+#define PSU_CONTROL
 //#define PSU_NAME "Power Supply"
 
 #if ENABLED(PSU_CONTROL)
@@ -405,6 +405,15 @@
   //#define PSU_POWERUP_DELAY      250    // (ms) Delay for the PSU to warm up to full power
   //#define LED_POWEROFF_TIMEOUT 10000    // (ms) Turn off LEDs after power-off, with this amount of delay
 
+  #define PSU_OFF_REDUNDANT             // Second pin for redundant power control
+  //#define PSU_OFF_REDUNDANT_OPPOSING    // Redundant pin works opposite standard pin
+
+  #define PS_ON1_PIN                  6  // Redundant Pin
+
+  #define PS_ON_EDM_PIN             8    // EDM Pins to monitor feedback on external power control relay. Fault on mismatch.
+  #define PS_ON1_EDM_PIN            8
+  #define PS_EDM_RESPONSE       250     // Time in MS to allow for relay action
+
   //#define POWER_OFF_TIMER               // Enable M81 D<seconds> to power off after a delay
   //#define POWER_OFF_WAIT_FOR_COOLDOWN   // Enable M81 S to power off only after cooldown
 

Marlin/src/MarlinCore.cpp

@@ -671,6 +671,25 @@ inline void manage_inactivity(const bool no_stepper_sleep=false) {
 
   TERN_(HOTEND_IDLE_TIMEOUT, hotend_idle.check());
 
+  #if ANY(PSU_CONTROL, AUTO_POWER_CONTROL)
+    #if defined(PS_ON_EDM_PIN)
+      if(ELAPSED(ms, powerManager.last_state_change_ms + PS_EDM_RESPONSE))
+      {
+        if(READ(PS_ON_PIN)!=READ(PS_ON_EDM_PIN))
+          kill(GET_TEXT_F(PS_ON_EDM_FAIL));
+      }
+    #endif
+
+    #if defined(PS_ON_EDM_PIN) && ENABLED(PSU_OFF_REDUNDANT)
+      if(ELAPSED(ms, powerManager.last_state_change_ms + PS_EDM_RESPONSE))
+      {
+        if(READ(PS_ON1_PIN)!=READ(PS_ON1_EDM_PIN))
+          kill(GET_TEXT_F(PS_ON1_EDM_FAIL));
+      }
+
+    #endif
+  #endif
+
   #if ENABLED(EXTRUDER_RUNOUT_PREVENT)
     if (thermalManager.degHotend(active_extruder) > (EXTRUDER_RUNOUT_MINTEMP)
       && ELAPSED(ms, gcode.previous_move_ms + SEC_TO_MS(EXTRUDER_RUNOUT_SECONDS))

Marlin/src/feature/power.cpp

@@ -60,6 +60,10 @@ bool Power::psu_on;
   millis_t Power::lastPowerOn;
 #endif
 
+#if defined(PS_ON_EDM_PIN) || (defined(PS_ON_EDM_PIN) && ENABLED(PSU_OFF_REDUNDANT))
+  static millis_t Power::last_state_change_ms = 0;
+#endif
+
 /**
  * Initialize pins & state for the power manager.
  *
@@ -87,6 +91,16 @@ void Power::power_on() {
   #endif
 
   OUT_WRITE(PS_ON_PIN, PSU_ACTIVE_STATE);
+  #if ENABLED(PSU_OFF_REDUNDANT)
+    #if (ENABLED(PSU_OFF_REDUNDANT_OPPOSING))
+      OUT_WRITE(PS_ON1_PIN, !PSU_ACTIVE_STATE);
+    #else
+      OUT_WRITE(PS_ON1_PIN, PSU_ACTIVE_STATE);
+    #endif
+  #endif
+  #if defined(PS_ON_EDM_PIN) || (defined(PS_ON_EDM_PIN) && ENABLED(PSU_OFF_REDUNDANT))
+    last_state_change_ms = millis();
+  #endif
   psu_on = true;
   safe_delay(PSU_POWERUP_DELAY);
   restore_stepper_drivers();
@@ -117,6 +131,17 @@ void Power::power_off() {
   #endif
 
   OUT_WRITE(PS_ON_PIN, !PSU_ACTIVE_STATE);
+  #if ENABLED(PSU_OFF_REDUNDANT)
+    #if (ENABLED(PSU_OFF_REDUNDANT_OPPOSING))
+      OUT_WRITE(PS_ON1_PIN, PSU_ACTIVE_STATE);
+    #else
+      OUT_WRITE(PS_ON1_PIN, !PSU_ACTIVE_STATE);
+    #endif
+  #endif
+  #if defined(PS_ON_EDM_PIN) || (defined(PS_ON_EDM_PIN) && ENABLED(PSU_OFF_REDUNDANT))
+    last_state_change_ms = millis();
+  #endif
+
   psu_on = false;
 
   #if ANY(POWER_OFF_TIMER, POWER_OFF_WAIT_FOR_COOLDOWN)

Marlin/src/feature/power.h

@@ -25,7 +25,7 @@
  * power.h - power control
  */
 
-#if ANY(AUTO_POWER_CONTROL, POWER_OFF_TIMER)
+#if ANY(AUTO_POWER_CONTROL, POWER_OFF_TIMER) || defined(PS_ON_EDM_PIN) || (defined(PS_ON_EDM_PIN) && ENABLED(PSU_OFF_REDUNDANT))
   #include "../core/millis_t.h"
 #endif
 
@@ -37,6 +37,10 @@ class Power {
     static void power_on();
     static void power_off();
 
+    #if defined(PS_ON_EDM_PIN) || (defined(PS_ON_EDM_PIN) && ENABLED(PSU_OFF_REDUNDANT))
+      static millis_t last_state_change_ms;
+    #endif
+
     #if ANY(POWER_OFF_TIMER, POWER_OFF_WAIT_FOR_COOLDOWN)
       #if ENABLED(POWER_OFF_TIMER)
         static millis_t power_off_time;

Marlin/src/inc/SanityCheck.h

@@ -3641,6 +3641,8 @@ static_assert(_PLUS_TEST(3), "DEFAULT_MAX_ACCELERATION values must be positive."
     #error "POWER_OFF_DELAY must be a positive value."
   #elif ENABLED(POWER_OFF_WAIT_FOR_COOLDOWN) && !(defined(AUTO_POWER_E_TEMP) || defined(AUTO_POWER_CHAMBER_TEMP) || defined(AUTO_POWER_COOLER_TEMP))
     #error "POWER_OFF_WAIT_FOR_COOLDOWN requires AUTO_POWER_E_TEMP, AUTO_POWER_CHAMBER_TEMP, and/or AUTO_POWER_COOLER_TEMP."
+  #elif ENABLED(PSU_OFF_REDUNDANT) && !PIN_EXISTS(PS_ON1)
+    #error "PSU_OFF_REDUNDANT requires PS_ON1_PIN."
   #endif
 #endif
 

Marlin/src/lcd/language/language_en.h

@@ -155,6 +155,8 @@ namespace LanguageNarrow_en {
   LSTR MSG_SPINDLE_REVERSE                = _UxGT("Spindle Reverse");
   LSTR MSG_SWITCH_PS_ON                   = _UxGT("Switch Power On");
   LSTR MSG_SWITCH_PS_OFF                  = _UxGT("Switch Power Off");
+  LSTR PS_ON_EDM_FAIL                     = _UxGT("PS_ON EDM Fault");
+  LSTR PS_ON1_EDM_FAIL                    = _UxGT("PS_ON1 EDM Fault");
   LSTR MSG_EXTRUDE                        = _UxGT("Extrude");
   LSTR MSG_RETRACT                        = _UxGT("Retract");
   LSTR MSG_MOVE_AXIS                      = _UxGT("Move Axis");

Marlin/src/pins/pinsDebug_list.h

@@ -901,6 +901,9 @@
 #if PIN_EXISTS(PS_ON)
   REPORT_NAME_DIGITAL(__LINE__, PS_ON_PIN)
 #endif
+#if PIN_EXISTS(PS_ON1)
+  REPORT_NAME_DIGITAL(__LINE__, PS_ON1_PIN)
+#endif
 
 //
 // LCD

Marlin/src/pins/pins_postprocess.h

@@ -477,6 +477,10 @@
   #undef PS_ON_PIN
   #define PS_ON_PIN -1
 #endif
+#if DISABLED(PSU_OFF_REDUNDANT) || DISABLED(PSU_CONTROL) || !defined(PS_ON1_PIN)
+  #undef PS_ON1_PIN
+  #define PS_ON1_PIN -1
+#endif
 #ifndef KILL_PIN
   #define KILL_PIN -1
 #endif