SPLUSS_724X_MOD

SPLUSS_724X_MOD (FB)

FUNCTION_BLOCK SPLUSS_724X_MOD

General

This is a two-channel differential pressure transmitter (including calculation of volume flow, including PT-1000 temperature sensor input).

7245: Measuring range: +/- 500 Pa (with manual zero point calibration) (Channels 1 + 2) 7247: Measuring range: +/- 7000 Pa (with manual zero point calibration) (Channels 1 + 2) 7249: Measuring range: +/- 500 Pa (with manual zero point calibration) (Channel 1)

Measuring range: +/- 7000 Pa (with manual zero point calibration) (Channel 2)

The transducer can optionally be equipped with a display.

The actual volume flow is calculated based on the differential pressure actual value of Channel 1

The configuration of the Modbus interface is done via DIP switches in the transducer Modbus - RTU Modbus address: 1 - 247 (0 = broadcast) 9600 - 38400 baud For data retention the options 1-8-E-1, 1-8-O-1, 1-8-N-2 and 1-8-N-1 (contrary to the specifications of the standard) can be set.

A terminating resistor (120 ohm) can be activated / deactivated via DIP switch.

The calculation coefficients for the volumetric flow display are not stored fail-safe against power loss. Therefore they must be written again when communication is restored.

The calibration of the differential pressure transducer must be performed in the device by hardware, since further derived measured values (volume flow - actual value) are calculated from this actual value.

Representation

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL	TRUE	Enable / disable communication (TRUE = enabled)
Input	byUnitId	BYTE	0	Address of the device (1 .. 247)
Input	xUpdateActual	BOOL	FALSE	Update of actual values (on every rising edge )
Input	xUpdateSetp	BOOL	FALSE	Update of setpoints (on every rising edge )
Input	xUpdateConfigWrite	BOOL	FALSE	Update of configuration (write access) ( on every rising edge)
Input	xResError	BOOL	FALSE	Reinitialization of the output ‘eErrorCodeCom’ ( on every rising edge )
Inout	ModbusClient	ModbusClientBase		Client of the device
Output	rDifPressureCH1	REAL		Differential pressure - Channel 1 unfiltered
Output	rDifPressureCH1_1s	REAL		Differential pressure - Channel 1 filtered 1s
Output	rDifPressureCH1_10s	REAL		Differential pressure - Channel 1 filtered 10s
Output	rVolumeFlowCH1	REAL		Volume flow - Channel 1
Output	rDifPressureCH2	REAL		Differential pressure - Channel 2 unfiltered
Output	rDifPressureCH2_1s	REAL		Differential pressure - Channel 2 filtered 1s
Output	rDifPressureCH2_10s	REAL		Differential pressure - Channel 2 filtered 10s
Output	rTemperature	REAL		Temperature unfiltered
Output	rTemperature_10s	REAL		Temperature filtered 10s
Output	xSensorOffsetInDevice	BOOL		Indicates whether sensor calibration must be performed in the device ( TRUE = calibration required in the device, FALSE = calibration required in the FB )
Output	xAlarm	BOOL		Collective fault (TRUE = fault)
Output	xAlarmCom	BOOL		Collective fault - communication (TRUE = fault)
Output	eErrorCodeCom	ModbusErrorCode		Error code - communication (0 = no error)
Output	xBusy	BOOL		Communication indicator (TRUE = communication)
Input Const	stDisplayText	STRING(7)	'powerIO'	Any text with 7 characters (fixed length) in the lowest display line (characters H - N)
Input Const	eDisplayValue	SPLUSS_724X_MOD_DISPLAY_VALUE	SPLUSS_724X_MOD_DISPLAY_VALUE.Standard_Display	Definition of the value to be displayed (static) (0 = Standard display)
Input Const	xDisplayAvailable	BOOL	FALSE	Specification whether a display is present (TRUE = display is present)
Input Const	eVolFlowEquationType	SPLUSS_724X_MOD_VOL_FLOW_EQUATION_TYPE	SPLUSS_724X_MOD_VOL_FLOW_EQUATION_TYPE.Rosenberg_Comefri_Gebhardt_Nicotra	Selection of the fan manufacturer to determine the formula for the calculation of the volume flow
Input Const	rVolFlowConstant	REAL	100.0	K-factor for calculating the current volume flow (1.0 - 2000.0)
Input Const	xEnAutoZero	BOOL	TRUE	Enable / disable of the automatic, cyclic zero point calibration (TRUE = enabled)
Input Const	eUnitType	SPLUSS_724X_MOD_UNIT_TYPE	SPLUSS_724X_MOD_UNIT_TYPE.Type_SI	Central selection of the unit system (0 = SI)
Input Const	eDeviceType	SPLUSS_724X_MOD_DEVICE_TYPE	SPLUSS_724X_MOD_DEVICE_TYPE.Type_7245	Selection of the device type (1 = 7148 = +/- 500Pa)
Input Const	tTimeUpdateConfigWrite	TIME	TIME#0ms	Update interval for the operations affected by the input 'xUpdateConfigWrite'
Input Const	tTimeUpdateSetp	TIME	TIME#0ms	Update interval for the operations affected by the input 'xUpdateSetp'
Input Const	tTimeUpdateActual	TIME	TIME#3s0ms	Update interval for the operations affected by the input 'xUpdateActual'