Beckhoff TwinCAT 2 TX1200, Manual

Page: 30 / 80

Programming
TX1200 30 Version: 1.1
6.2.4 MP_DamperLinearActuator
This function block is used to control and monitor an actuator of a damper and of a globe valve.
MP_Address is used to specify the MP-Bus device with which the function block is to communicate. bStart
activates communication with the MP-Bus device. bBusy indicates that the function block is active. If bStart
remains TRUE, the device is addressed cyclically with a period specified by the time in TMPolling . The time
should be set longer than 1 s. bError is used to indicate an error in communication with the actuator. The
type of the error can be read with iErrorID .
A positive edge at bReset clears any pending error messages from the actuator. This resets errors that
affect the output variables bErr_MecOcld , bErr_ActHunt and bErrMecTrv . If the error itself is still present,
the actuator will set these error bits again.
SetPoint is used to adjust the position of the damper from 0...100 %. The current position of the actuator can
be read through ActValue .
If a sensor is connected to the actuator, its type is to be indicated in iSensorTyp . If no sensor is connected,
the value "0" should be entered, or the variable left open. A digital sensor should be parameterized with "1".
The state of the sensor can be queried through
bMP_Sensor_Digi . Analog sensors "2...6" are output in
variable iMP_Sensor_Analog .
VAR_INPUT
MP_Address : USINT := 1;
bStart : BOOL;
bReset : BOOL;
iSensorTyp : INT;
SetPoint : USINT;
strDataKL6771 : DataKL6771;
TMpolling : TIME := t#10s;
MP_Address: MP-Bus address of the slave.
bStart: a positive edge starts the function block. If this remains continuously TRUE, the function block will be
activated cyclically with a period specified by the time in TMPolling .
bReset: a positive edge resets the actuator's error messages.
iSensorTyp: 0: no sensor connected, 1: digital sensor connected, 2: analog sensor connected (0...35 V),
3...6: output of a resistance in ohms (3...5 applies to PT1000, NI1000 and NI1000LuS; 6 applies to NTC). To
convert to a temperature, use the corresponding conversion functions.
SetPoint: 0...100 % the set damper position specified for the actuator.
strDataKL6771: the data structure with which the KL6771 [
}
25] function block must be linked (see
DataKL6771 [
}
72] ).
TMpolling: the time for which the function block should address the actuator. Default 10 s, minimum time
1 s.