MP_CMV

This function block is used to control and monitor a volume flow regulator.

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.

Inputs

VAR_INPUT
  MP_Address    : USINT := 1;
  bStart        : BOOL;
  bSet          : BOOL;
  bOpen         : BOOL;
  bClose        : BOOL;
  bReset        : BOOL;
  iSensorTyp    : INT;
  SetPoint      : USINT;
  MaxVol        : WORD;
  MinVol        : WORD;
  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.
bSet	BOOL	A positive edge writes the data MaxVol and MinVol to the actuator.
bOpen	BOOL	A positive edge opens the dampers of the actuator, while a negative edge cancels the forced ventilation.
bClose	BOOL	A positive edge closes the dampers of the actuator, while a negative edge cancels the forced closure.
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 volume flow rate
MaxVol	WORD	30...100 % Maximum volume flow rate
MinVol	WORD	0…100 % Minimum volume flow rate
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.

Outputs

VAR_OUTPUT
  bBusy             : BOOL;
  bError            : BOOL;
  iErrorId          : MP_Error;
  ActValue          : WORD;
  bMP_Sensor_Digi   : BOOL;
  iMP_Sensor_Analog : INT;
  AirVolume_m3h     : WORD;
  iVnom_m3h         : INT;
  act_MaxVol        : INT;
  act_MinVol        : INT;
  bErr_ActHunt      : BOOL;
  bErr_MecTrv       : BOOL;
  bErr_MecOvld      : BOOL;
  rTemperature      : 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.
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".
AirVolume_m3h	WORD	Output of the volume flow rate in m³/h.
iVnom_m3h	INT	Nominal air volume flow in m³/h. This output is available from version 1.12.0. VAV is read and must be > 0. If 0, then the calculation of AirVolume_m3h is not correct.
act_MaxVol	INT	Maximum set volume flow rate in %.
act_MinVol	INT	Minimum set volume flow rate in %.
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.
bErr_MecOvld	BOOL	Actuator error, "Overload"; the set position could not be reached.
rTemperature	LREAL	Temperature in the duct in °C.

Requirements

Development environment	required TC3 PLC library
TwinCAT from v3.1.4022.14	Tc2_MPBus from 3.4.8.0