Auto-select power plugs for RAMPS derivatives

Marlin/Conditionals_LCD.h

     #define BOOTSCREEN_TIMEOUT 2500
   #endif
 
+  /**
+   * Extruders have some combination of stepper motors and hotends
+   * so we separate these concepts into the defines:
+   *
+   *  EXTRUDERS    - Number of Selectable Tools
+   *  HOTENDS      - Number of hotends, whether connected or separate
+   *  E_STEPPERS   - Number of actual E stepper motors
+   *  TOOL_E_INDEX - Index to use when getting/setting the tool state
+   *  
+   */
+  #if ENABLED(SINGLENOZZLE)             // One hotend, multi-extruder
+    #define HOTENDS      1
+    #define E_STEPPERS   EXTRUDERS
+    #define E_MANUAL     EXTRUDERS
+    #define TOOL_E_INDEX current_block->active_extruder
+    #undef TEMP_SENSOR_1_AS_REDUNDANT
+    #undef HOTEND_OFFSET_X
+    #undef HOTEND_OFFSET_Y
+  #elif ENABLED(SWITCHING_EXTRUDER)     // One E stepper, unified E axis, two hotends
+    #define HOTENDS      EXTRUDERS
+    #define E_STEPPERS   1
+    #define E_MANUAL     1
+    #define TOOL_E_INDEX 0
+    #ifndef HOTEND_OFFSET_Z
+      #define HOTEND_OFFSET_Z { 0 }
+    #endif
+  #elif ENABLED(MIXING_EXTRUDER)        // Multi-stepper, unified E axis, one hotend
+    #define HOTENDS      1
+    #define E_STEPPERS   MIXING_STEPPERS
+    #define E_MANUAL     1
+    #define TOOL_E_INDEX 0
+  #else                                 // One stepper, E axis, and hotend per tool
+    #define HOTENDS      EXTRUDERS
+    #define E_STEPPERS   EXTRUDERS
+    #define E_MANUAL     EXTRUDERS
+    #define TOOL_E_INDEX current_block->active_extruder
+  #endif
+
 #endif //CONDITIONALS_LCD_H

Marlin/Conditionals_post.h

   #define HAS_PID_FOR_BOTH (ENABLED(PIDTEMP) && ENABLED(PIDTEMPBED))
 
   /**
-   * Extruders have some combination of stepper motors and hotends
-   * so we separate these concepts into the defines:
-   *
-   *  EXTRUDERS    - Number of Selectable Tools
-   *  HOTENDS      - Number of hotends, whether connected or separate
-   *  E_STEPPERS   - Number of actual E stepper motors
-   *  TOOL_E_INDEX - Index to use when getting/setting the tool state
-   *  
-   */
-  #if ENABLED(SINGLENOZZLE)             // One hotend, multi-extruder
-    #define HOTENDS      1
-    #define E_STEPPERS   EXTRUDERS
-    #define E_MANUAL     EXTRUDERS
-    #define TOOL_E_INDEX current_block->active_extruder
-    #undef TEMP_SENSOR_1_AS_REDUNDANT
-    #undef HOTEND_OFFSET_X
-    #undef HOTEND_OFFSET_Y
-  #elif ENABLED(SWITCHING_EXTRUDER)     // One E stepper, unified E axis, two hotends
-    #define HOTENDS      EXTRUDERS
-    #define E_STEPPERS   1
-    #define E_MANUAL     1
-    #define TOOL_E_INDEX 0
-    #ifndef HOTEND_OFFSET_Z
-      #define HOTEND_OFFSET_Z { 0 }
-    #endif
-  #elif ENABLED(MIXING_EXTRUDER)        // Multi-stepper, unified E axis, one hotend
-    #define HOTENDS      1
-    #define E_STEPPERS   MIXING_STEPPERS
-    #define E_MANUAL     1
-    #define TOOL_E_INDEX 0
-  #else                                 // One stepper, E axis, and hotend per tool
-    #define HOTENDS      EXTRUDERS
-    #define E_STEPPERS   EXTRUDERS
-    #define E_MANUAL     EXTRUDERS
-    #define TOOL_E_INDEX current_block->active_extruder
-  #endif
-
-  /**
    * Default hotend offsets, if not defined
    */
   #if HOTENDS > 1

Marlin/pins_RAMPS.h

   #define SLED_PIN           -1
 #endif
 
-/*
-
 // Augmentation for auto-assigning RAMPS plugs
-
 #if DISABLED(IS_RAMPS_EEB) && DISABLED(IS_RAMPS_EEF) && DISABLED(IS_RAMPS_EFB) && DISABLED(IS_RAMPS_EFF) && DISABLED(IS_RAMPS_SF)
   #if HOTENDS > 1
     #if TEMP_SENSOR_BED
   #endif
 #endif
 
-*/
-
 /**
  * Hi Voltage PWM Pin Assignments
  */