FB_CTRL_TempController

The temperature controller function block FB_CTRL_TempController has various inputs and outputs, which are described below. All the controller's parameters are passed to it via structures.

Interface

VAR_INPUT

VAR_INPUT
  eCtrlMode               : E_CTRL_MODE;
  bSelSetpoint            : BOOL;
  fW1                     : LREAL;
  fW2                     : LREAL;
  fX                      : LREAL;
  fYManual                : LREAL;
  bOpenThermocouple       : BOOL; (* thermocouple *)
  bReverseThermocouple    : BOOL;
  bBackVoltage            : BOOL;
  bLeakage                : BOOL; (* heating system *)
  bShortCircuit           : BOOL;
  bOpenCircuit            : BOOL;
  sParaControllerExternal : ST_CTRL_ParaController
END_VAR

Name	Unit	Value range	Description
eControlMode	1	E_CTRL_MODE	Mode switching
bSelSetpoint	1	[TRUE,FALSE]	Selects one of two possible setpoints. FALSE selects the normal setpoint, while TRUE selects the standby setpoint.
fW1	°C	LREAL	Setpoint
fW2	°C	LREAL	Standby setpoint is usually smaller than fW1. fSelSetpoint can be used to switch between fW1 and fW2.
fX	°C	LREAL	Actual value
fYManual	-100% - +100%	LREAL	Control value in manual operation
bOpenThermocouple	1	[TRUE,FALSE]	The thermocouple is open if TRUE. Must be indicated by the hardware.
bReverseThermocouple	1	[TRUE,FALSE]	TRUE indicates that the thermocouple has been connected with the wrong polarity. Must be indicated by the hardware.
bBackVoltage	1	[TRUE,FALSE]	TRUE indicates that the input voltage at the thermocouple is too high. Must be indicated by the hardware.
bLeakage	1	[TRUE,FALSE]	TRUE indicates that leakage current has been detected at the heating element. Must be indicated by the hardware.
bShortCircuit	1	[TRUE,FALSE]	TRUE indicates that a short circuit has been detected at the heating element. Must be indicated by the hardware.
bOpenCircuit	1	[TRUE,FALSE]	TRUE indicates that an open circuit has been detected at the heating element. Must be indicated by the hardware.
sControllerParameter	none	Structure	General parameters (sampling time etc.) are passed to the function block in this structure.
sParaControllerExternal	none	Structure	An external controller parameter set is passed to the function block in this structure.

VAR_OUTPUT

VAR_OUTPUT
  fYAnalog                : LREAL;
  bYPWMPos                : BOOL;
  bYPWMNeg                : BOOL;
  bYDigPos                : BOOL;
  bYDigNeg                : BOOL;
  dwAlarm                 : DWORD;
  fMaxOverShoot           : LREAL;
  tStartUpTime            : TIME;
  eCtrlState              : E_CTRL_STATE := eCTRL_STATE_IDLE;
  sParaControllerInternal : ST_CTRL_ParaController;
  bError                  : BOOL;
  eErrorId                : E_CTRL_ErrorCodes;
END_VAR

Name	Unit	Value range	Description
fYAnalog	none	LREAL	Analog control value
bYPWMPos	none	[TRUE,FALSE]	Boolean output, pulse width modulated. Positive/heating mode
bYPWMNeg	none	[TRUE,FALSE]	Boolean output, pulse width modulated. Negative/cooling mode
bYDigPos	none	[TRUE,FALSE]	Boolean output of a three-step controller (TRUE control value 100%, FALSE control value off)
bYDigNeg	none	[TRUE,FALSE]	Boolean output of a three-step controller (TRUE control value -100%, FALSE control value off)
dwAlarm	none	DWORD	Alarm messages (see ENUM ...)
fMaxOverShoot	°C	LREAL	Max. overshoot in °C above/below setpoint.
tStartUpTime	TIME	-	Startup time until the setpoint is reached for the first time
eCtrlState	none	E_CTRL_STATE	current controller status (see ENUM ...)
sParaControllerInternal	none	Structure	In this structure the internal controller parameter set (determined by the tuning) is made available.
bError	none	[TRUE,FALSE]	If an error is present, then `bError` is TRUE.
iErrorId	none	INT	If `bError` is TRUE, then `iErrorId` provides an error code (see ENUM ...)

VAR_IN_OUT

VAR_IN_OUT
  sControllerParameter    : ST_CTRL_TempCtrlParameter; (* controller parameter set *)
END_VAR

Name	Type	Description
sController parameter	ST_CTRL_TempCtrl Parameter	Parameter structure of the function block

Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT 3.1.4016	PC or CX	Tc2_TempController