MPL_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.
SetPoint is used to adjust the position of the damper from 0...100 %. The current position of the actuator can be read through ActValue.
VAR_INPUT
MP_Address : USINT := 1;
bStart : BOOL;
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.
SetPoint: 0...100 % the set damper position specified for the actuator.
strDataKL6771: the data structure with which the KL6771 function block must be linked (see DataKL6771).
TMpolling: the time for which the function block should address the actuator. Default 10 s, minimum time 1 s.
VAR_OUTPUT
bBusy : BOOL;
ActValue : WORD;
iErrorID : MP_Error;
bError : BOOL;
bBusy: this bit is set for as long as the function block is active.
ActValue: contains the current position of the actuator (0...100 %).
iErrorID: this output outputs an error code in the event of an error (see MP_Error). bError goes TRUE at the same time.
bError: the output becomes TRUE as soon as an error occurs. This error is described via the iErrorID variable.