MP_DamperLinearActuator

MP_DamperLinearActuator 1:

This function block is used to control and monitor a drive 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 second. bError is used to indicate an error in communication with the drive. The type of the error can be read with iErrorID.

A rising edge at bReset clears any pending error messages from the drive. This resets errors that affect the output variables bErr_MecOcld, bErr_ActHunt and bErrMecTrv. If the error itself is still present, the drive will set these error bits again.

SetPoint is used to adjust the position of the damper from 0…100%. The current position of the drive can be read through ActValue.

If a sensor is connected to the drive, iSensorTyp should be used to specify the sensor type. If no sensor is connected, the value "0" should be entered, or the variable should be left blank. A digital sensor should be parameterized with "1". The state of the sensor can be interrogated through bMP_Sensor_Digi. Analog sensors "2...6" are output in variable iMP_Sensor_Analog.

MP_DamperLinearActuator 2: Inputs

VAR_INPUT
  MP_Address    : USINT := 1;
  bStart        : BOOL := TRUE;
  bReset        : BOOL;
  iSensorTyp    : INT;
  SetPoint      : USINT;
  strDataKL6771 : DataKL6771;
  TMpolling     : TIME := t#10s;
END_VAR

Name

Type

Description

MP_Address

USINT

MP-Bus address of the slave.

bStart

BOOL

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

BOOL

A positive edge resets the actuator's error messages.

iSensorTyp

INT

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

USINT

0..100 % set damper position of the actuator.

strDataKL6771

DataKL6771

The data structure with which the KL6771() function block must be linked.

TMpolling

TIME

The time for which the function block should address the actuator. Default 10 s, minimum time 1 s.

MP_DamperLinearActuator 3: Outputs

VAR_OUTPUT
  bBusy             : BOOL;
  ActValue          : WORD;
  bMP_Sensor_Digi   : BOOL;
  iMP_Sensor_Analog : INT;
  iErrorID          : MP_Error;
  bError            : BOOL;
  bErr_MecOvld      : BOOL;
  bErr_ActHunt      : BOOL;
  bErr_MecTrv       : BOOL;
END_VAR

Name

Type

Description

bBusy

BOOL

This bit is set for as long as the function block is active.

ActValue

WORD

Contains the current position of the actuator (0...100 %).

bMP_Sensor_Digi

BOOL

If a digital sensor is connected, its state is indicated through this variable. iSensorTyp must be "1".

iMP_Sensor_Analog

INT

If an analog sensor is connected, its value is indicated through this variable. iSensorTyp must be "2...6".

iErrorId

MP_ERROR

This output outputs an error code in the event of an error. bError goes TRUE at the same time.

bError

BOOL

This output goes TRUE as soon as an error occurs. This error is described via the iErrorId variable.

bErr_MecOvld

BOOL

Actuator error, "Overload"; the set position could not be reached.

bErr_ActHunt

BOOL

Actuator error, "Regulating oscillation"; the actuator is swinging backwards and forwards.

bErr_MecTrv

BOOL

Actuator error, "Positioning angle exceeded"; the actuator has passed more than 10° beyond the adaptation position.

Requirements

Development environment

required TC3 PLC library

TwinCAT from v3.1.4020.14

Tc2_MPBus from 3.3.5.0