MP_VRU_Process

This function block is suitable for VAV actuators VRU-D3-BAC, VRU-M1-BAC and VRU-M1R-BAC (max. 8 slaves). For more information please visit www.belimo.com.

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.

Inputs

VAR_INPUT
  MP_Address       : USINT := 1;
  bStart           : BOOL;
  strDataKL6771    : DataKL6771;
  TMpolling        : TIME := t#10s;
  rSetpoint        : LREAL;
  nOverrideControl : E_MP_VRU_OverrideControl;
  nCommand         : E_MP_VRU_Command;
  nDataRead        : BYTE;
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.
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.
rSetpoint	LREAL	Value in % (0.. 100 %).
nOverrideControl	E_MP_VRU_OverrideControl	Setpoint override
nCommand	E_MP_VRU_Command	Command for service and test functions of the actuator.
nDataRead	BYTE	0xFF - read all data; bit 0 - read relative position; bit 1 - read absolute position; bit 2 - read relative volume flow rate; bit 3 - read absolute volume flow rate; bit 4 - read value sensor 1; bit 5 - read analog setpoint; bit 6 - read relative differential pressure; bit 7 - read absolute differential pressure

Outputs

VAR_OUTPUT
  bBusy                  : BOOL;
  bError                 : BOOL;
  iErrorId               : MP_Error;
  strMP_Serial_Number    : MP_Serial_Number;
  st_MP_VRU_ServiceInfo  : St_MP_VRU_ServiceInfo;
  rSetpoint_Read         : LREAL;
  nOverrideControl_Read  : E_MP_VRU_OverrideControl;
  nCommand_Read          : E_MP_VRU_Command;
  rRelativePosition      : LREAL;
  rAbsolutePosition      : LREAL;
  rRelativeVolumeticFlow : LREAL;
  rAbslouteVolumeticFlow : LREAL;
  rSensor1Value          : LREAL;
  rSetpointAnalog        : LREAL;
  rRelativeDeltaPressure : LREAL;
  rAbsoluteDeltaPressure : LREAL;
END_VAR

Name	Type	Description
bBusy	BOOL	This bit is set for as long as the function block is active.
bError	BOOL	This output goes TRUE as soon as an error occurs. This error is described via the iErrorId variable.
iErrorId	MP_ERROR	This output outputs an error code in the event of an error. bError goes TRUE at the same time.
strMP_Serial_Number	MP_Serial_Number	Structure for the serial number
st_MP_VRU_ServiceInfo	St_MP_VRU_ServiceInfo	Malfunction and service information
rSetpoint_Read	LREAL	Setpoint
nOverrideControl_Read	E_MP_VRU_OverrideControl	Override
nCommand_Read	E_MP_VRU_Command	Command
rRelativePosition	LREAL	Relative position in %. Value -1 means data disabled (see VAR_INPUT nDataRead).
rAbsolutePosition	LREAL	Absolute position in °. Value -1 means data disabled (see VAR_INPUT nDataRead).
rRelativeVolumeticFlow	LREAL	Relative volume flow rate in %. Value -1 means data disabled (see VAR_INPUT nDataRead).
rAbslouteVolumeticFlow	LREAL	Absolute volume flow rate in m³/h. Value of -1 means data disabled (see VAR_INPUT nDataRead).
rSensor1Value	LREAL	Value of sensor 1 in mV/Ohm. Value -1 means data disabled (see VAR_INPUT nDataRead).
rSetpointAnalog	LREAL	Analog setpoint in %. Value -1 means data disabled (see VAR_INPUT nDataRead).
rRelativeDeltaPressure	LREAL	Relative differential pressure %. Value -1 means data disabled (see VAR_INPUT nDataRead).
rAbsoluteDeltaPressure	LREAL	Absolute differential pressure in Pa. Value -1 means data disabled (see VAR_INPUT nDataRead).

Requirements

Development environment	required TC3 PLC library
TwinCAT from v3.1.4024.22	Tc2_MPBus from 3.4.13.0