Beckhoff TwinCAT 3 Manual page 22

PLC libraries
Interface
Table 1: Inputs
Name Unit
eControlMode 1
bSelSetpoint 1
fW1 °C
fW2 °C
fX °C
fYManual -100% -
+100%
bOpenThermoc 1
ouple
bReverseTherm 1
ocouple
bBackVoltage 1
bLeakage 1
bShortCircuit 1
bOpenCircuit 1
sControllerPara none
meter
sParaController none
External
Table 2: Outputs
Name Unit
fYAnalog none
bYPWMPos none
bYPWMNeg none
bYDigPos none
bYDigNeg none
dwAlarm none
fMaxOverShoot °C
tStartUpTime TIME
eCtrlState none
sParaControllerI none
nternal
bError none
iErrorId none
22
Range Description
E_CTRL_MODE Switches modes.
[TRUE,FALSE] Selects one of two possible set values. FALSE selects
the normal set value, while TRUE selects the standby set
value.
LREAL Setpoint
LREAL Standby set value, generally smaller than fW1.
fSelSetpoint can be used to switch between fW1 and
fW2.
LREAL Actual value. This value must be converted to LREAL.
LREAL Control value in manual mode.
[TRUE,FALSE] The thermocouple is open if TRUE. Must be indicated by
the hardware (e.g. KLxxxx).
[TRUE,FALSE] TRUE indicates that the thermocouple has been
connected with the wrong polarity. Must be indicated by
the hardware.
[TRUE,FALSE] TRUE indicates that the input voltage at the
thermocouple is too high. Must be indicated by the
hardware.
[TRUE,FALSE] TRUE indicates that leakage current has been detected
at the heating element. Must be indicated by the
hardware.
[TRUE,FALSE] TRUE indicates that a short circuit has been detected at
the heating element. Must be indicated by the hardware.
[TRUE,FALSE] TRUE indicates that an open circuit has been detected at
the heating element. Must be indicated by the hardware.
Structure General parameters (sampling rate etc.) are passed to
the block in this structure.
Structure An external controller parameter set is passed to the
block in this structure.
Range Description
LREAL Analogue control value.
[TRUE,FALSE] Boolean output, pulse width modulated (positive, heating)
[TRUE,FALSE] Boolean output, pulse width modulated (negative,
cooling)
[TRUE,FALSE] Boolean output of a three-point controller (TRUE control
value 100%, FALSE control value off)
[TRUE,FALSE] Boolean output of a three-point controller (TRUE control
value -100%, FALSE control value off)
DWORD Alarm signals (see ENUM ...)
LREAL max. overshoot in °C under/over setpoint
- rising time until the first time reaching the setpoint.
E_CTRL_STATE actuel state of the controller (s. ENUM ...)
Structure PID controller parameter from tuning.
[TRUE,FALSE] If an error is present, then bError is TRUE.
INT If bError is TRUE, then iErrorId provides an error code
(see ENUM ...)
Version: 1.1 TC3 Temperature Controller