text: <user>
  Create a function block for temperature control in TwinCAT Structured Text<|endoftext|>
  <assistant>
  FUNCTION_BLOCK FB_TemperatureControl
  VAR_INPUT
      fSetpoint       : LREAL;    // Desired temperature setpoint
      fCurrentTemp    : LREAL;    // Current temperature reading
      bEnable         : BOOL;     // Enable control
  END_VAR
  
  VAR_OUTPUT
      fHeaterOutput   : LREAL;    // Heater output (0-100%)
      bError          : BOOL;     // Error flag
      nErrorID        : UDINT;    // Error ID
  END_VAR
  
  VAR
      fbPID           : FB_CTRL_PID;   // PID controller function block
      fKp             : LREAL := 1.0;  // Proportional gain
      fTn             : LREAL := 10.0; // Integral time
      fTv             : LREAL := 1.0;  // Derivative time
      tTaskCycleTime  : TIME := T#10MS; // PLC task cycle time
  END_VAR
  
  // Main program
  IF bEnable THEN
      // Configure and run PID controller
      fbPID(
          fSetpointValue    := fSetpoint,
          fActualValue      := fCurrentTemp,
          fKp               := fKp,
          fTn               := fTn,
          fTv               := fTv,
          tTaskCycleTime    := tTaskCycleTime,
          tCtrlCycleTime    := tTaskCycleTime,
          eMode             := E_CTRL_MODE.eCTRL_MODE_ACTIVE
      );
      
      // Set heater output
      fHeaterOutput := LIMIT(0.0, fbPID.fCtrlOutput, 100.0);
      
      // Error handling
      IF fbPID.bError THEN
          bError   := TRUE;
          nErrorID := fbPID.nErrorId;
      ELSE
          bError   := FALSE;
          nErrorID := 0;
      END_IF
  ELSE
      // Disable control and reset outputs
      fbPID(eMode := E_CTRL_MODE.eCTRL_MODE_RESET);
      fHeaterOutput := 0.0;
      bError        := FALSE;
      nErrorID      := 0;
  END_IF
  
  (* 
  This function block implements a temperature control system using a PID controller.
  It takes a temperature setpoint and current temperature as inputs, and outputs a
  heater control signal. The PID parameters can be tuned for optimal performance.
  *)
  
  (* 
  Suggested TwinCAT 3 features to enhance this implementation:
  1. Use Scope View for real-time monitoring and tuning of the PID controller.
  2. Implement TC3 Temperature Controller library for advanced temperature control features.
  3. Utilize TwinCAT HMI for creating a user interface to monitor and control the temperature system.
  *)<|endoftext|>
  