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
      fTd             : LREAL := 1.0;   // Derivative damping time
  END_VAR
  
  // Main control logic
  fbPID(
      fSetpointValue  := fSetpoint,
      fActualValue    := fCurrentTemp,
      bReset          := NOT bEnable,
      fKp             := fKp,
      fTn             := fTn,
      fTv             := fTv,
      fTd             := fTd
  );
  
  // Set heater output and limit to 0-100%
  fHeaterOutput := LIMIT(0.0, fbPID.fOut, 100.0);
  
  // Error handling
  IF fbPID.bARWactive THEN
      bError := TRUE;
      nErrorID := 16#1000;  // Anti-reset windup active
  ELSIF ABS(fSetpoint - fCurrentTemp) > 10.0 AND bEnable THEN
      bError := TRUE;
      nErrorID := 16#2000;  // Large temperature deviation
  ELSE
      bError := FALSE;
      nErrorID := 0;
  END_IF
  
  (* 
  This function block implements a temperature control system using a PID controller.
  It takes a setpoint and current temperature as inputs, and outputs a heater control signal.
  The PID parameters can be tuned for optimal performance.
  Error handling includes detecting anti-reset windup and large temperature deviations.
  *)
  
  // Related TwinCAT 3 features and techniques:
  // 1. Use TC3 Temperature Controller to implement more advanced temperature control algorithms.
  // 2. Implement data logging using TwinCAT Scope View for temperature trend analysis.
  // 3. Consider using TwinCAT HMI for creating a user interface to monitor and control the temperature system.<|endoftext|>
  