FB_TempController

FB_TempController 1:

The temperature controller function block FB_TempController has a variety of inputs and outputs that are described below. All the controller's parameters are passed to it via structures. The definition of the structures and enums can be found here.

Note

This version of the function block is obsolete.

You should no longer use this function block.

Interface

VAR_INPUT

VAR_INPUT
  bOn                       : BOOL;
  bInit                     : BOOL;
  bTune                     : BOOL;
  bManual                   : BOOL;
  bSelSetpoint              : BOOL;
  bSelCtrlParameterSe       : BOOL;
  bEnableSoftStart          : BOOL;
  bEnableRamping            : BOOL;
  fW1                       : LREAL;
  fW2                       : LREAL;
  fX                        : LREAL;
  bOpenThermocouple         : BOOL;
  bReverseThermocouple      : BOOL;
  bBackVoltage              : BOOL;
  bLeakage                  : BOOL;
  bShortCircuit             : BOOL;
  bOpenCircuit              : BOOL;
  sParaControllerExternal   : ST_ParaController;
  sLogData                  : ST_LogData := (bLog := FALSE, strLogFileName :='', strLogString := '' );
END_VAR

Name	Unit	Value range	Description
bOn	1	[TRUE,FALSE]	TRUE switches the controller on.
bInit	1	[TRUE,FALSE]	Initialization flag, which must be active (TRUE) for precisely the first cycle in which the controller is called.
bTune	1	[TRUE,FALSE]	A rising edge switches the self-tuning on. If it is switched to FALSE during the self-tuning process then the self-tuning is aborted and the controller continues operation using the old parameters (if they are still present).
bManual	1	[TRUE,FALSE]	TRUE switches manual operation on. If the signal goes FALSE again, the controller returns to automatic mode.
bSelSetpoint	1	[TRUE,FALSE]	Selects one of two possible setpoints. FALSE selects the normal setpoint, while TRUE selects the standby setpoint.
bSelCtrlParameterSet	1	[TRUE,FALSE]	Selects one of two parameter sets. FALSE causes the internal (determined) parameter set to be used, while TRUE switches to one provided externally.
bEnableSoftStart	1	[TRUE,FALSE]	The soft start-up process is used if TRUE.
bEnableRamping	1	[TRUE,FALSE]	TRUE causes each setpoint step-change to be converted to a ramp.
fW1	°C	LREAL	Setpoint
fW2	°C	LREAL	Standby setpoint, generally smaller than fW1. fSelSetpoint can be used to switch between fW1 and fW2.
fX	°C	LREAL	Actual value - this value must be converted to LREAL.
bOpenThermocouple	1	[TRUE,FALSE]	The thermocouple is open if TRUE. Must be indicated by the hardware (e.g. KLxxxx).
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.
sLogData	none	Structure	This structure passes parameters for logging to the function block (filenames etc.).

VAR_OUTPUT

VAR_OUTPUT
  fYAnalog                  : LREAL;
  bYPWM                     : BOOL;
  bYDig                     : BOOL;
  bYDigPos                  : BOOL;
  bYDigNeg                  : BOOL;
  dwAlarm                   : DWORD;
  iState                    : States        := TC_STATE_IDLE;
  sParaControllerInternal   : ST_ParaController;
  bError                    : BOOL;
  iErrorId                  : ErrorCodes;
END_VAR

Name	Unit	Value range	Description
fYAnalog	none	LREAL	Analog control value
bYPWM	none	[TRUE,FALSE]	Boolean output, pulse width modulated
bYDig	none	[TRUE,FALSE]	Boolean output of an on-off controller (TRUE control value 100%, FALSE control value off)
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 ...)
iState	none	INT	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_ControllerParameter;
END_VAR

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

Requirements

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