如何用Gemini 3.0开发自动编写PLC程序的App！

FUNCTION_BLOCK "FB_Conveyor_Control"
{ S7_Optimized_Access := 'TRUE' }
VERSION : 0.1
   VAR_INPUT 
      I_StartBtn : Bool;   // Start Button (Normally Open - Active High)
      I_StopBtn : Bool;   // Stop Button (Normally Closed - Active Low/Wire Break Safe)
      I_EStop : Bool;   // Emergency Stop Status (True = Healthy/Reset, False = Activated)
      I_ProductSensor : Bool;   // Photo eye/Sensor input (True when product detected)
      I_FaultReset : Bool;   // Optional: Reset button for timeout fault
   END_VAR

   VAR_OUTPUT 
      Q_ConveyorMotor : Bool;   // Motor Contactor Output
      Q_TimeoutFault : Bool;   // Fault indicator if sensor not triggered in time
   END_VAR

   VAR 
      Stat_IsRunning : Bool;   // Internal latch for motor running state
      Stat_TimeoutError : Bool;   // Internal latch for error state
      Inst_WatchdogTimer {InstructionName := 'TON_TIME'; LibVersion := '1.0'} : TON_TIME;   // IEC Timer Instance
   END_VAR

   VAR CONSTANT 
      C_TIMEOUT_DURATION : Time := T#10s;   // Constant for timeout limit
   END_VAR


BEGIN
// =============================================================
// REGION: Safety & Interlocks
// Logic to ensure machine is safe to operate. 
// E-Stop must be True (Healthy) and no active faults present.
// =============================================================

// Immediate shutdown if E-Stop is pressed (Input goes Low)
	IF NOT #I_EStop THEN
	    #Stat_IsRunning := FALSE;
	    #Q_ConveyorMotor := FALSE;
	    // Note: In a real SIL/PL rated system, E-Stop cuts power via hardware relay.
	    // This software logic is for status feedback and state cleanup.
	    RETURN; 
	END_IF;

// Fault Reset Logic
	IF #I_FaultReset AND #Stat_TimeoutError THEN
	    #Stat_TimeoutError := FALSE;
	END_IF;

// =============================================================
// REGION: Run Logic (Start/Stop Circuit)
// Standard 3-Wire Control Logic (Latch)
// =============================================================

// Start Conditions: Start Button Pressed, Stop Button NOT active (High), No Faults
	IF #I_StartBtn AND #I_StopBtn AND NOT #Stat_TimeoutError THEN
	    #Stat_IsRunning := TRUE;
	END_IF;

// Stop Conditions: Stop Button Pressed (Low) OR Fault occurred
	IF NOT #I_StopBtn OR #Stat_TimeoutError THEN
	    #Stat_IsRunning := FALSE;
	END_IF;

// =============================================================
// REGION: Watchdog Timer Logic
// Logic: If motor is running AND sensor is NOT seeing product, count up.
// If sensor sees product, the timer input goes false and resets current time.
// =============================================================

#Inst_WatchdogTimer(IN := #Stat_IsRunning AND NOT #I_ProductSensor,
	                    PT := #C_TIMEOUT_DURATION);

// If Timer finishes (Q goes high), trigger fault
	IF #Inst_WatchdogTimer.Q THEN
	    #Stat_TimeoutError := TRUE;
	    #Stat_IsRunning := FALSE; // Stop the motor immediately
	END_IF;

// =============================================================
// REGION: Output Assignment
// =============================================================

#Q_ConveyorMotor := #Stat_IsRunning;
#Q_TimeoutFault := #Stat_TimeoutError;

END_FUNCTION_BLOCK