SPLUSS_724X_MOD

SPLUSS_724X_MOD (FB)

FUNCTION_BLOCK SPLUSS_724X_MOD

General

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

7245: Measurement range: +/- 500 Pa (with manual zero-point calibration) (channels 1 + 2) 7247: Measurement range: +/- 7000 Pa (with manual zero-point calibration) (channels 1 + 2) 7249: Measurement range: +/- 500 Pa (with manual zero-point calibration) (channel 1)

Measurement range: +/- 7000 Pa (with manual zero-point calibration) (channel 2)

The transmitter can optionally be equipped with a display.

The actual volumetric flow is calculated based on the differential pressure actual value of channel 1

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

A termination resistor (120 ohm) can be enabled/disabled 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 resumed correctly.

The calibration of the differential pressure transmitter must be performed on the device by hardware, since further derived measured variables (volumetric flow actual value) are calculated from this actual value.

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL	TRUE	Enable / disable of communication ( TRUE = enabled )
Input	byUnitId	BYTE	0	Device address ( 1 .. 247 )
Input	xUpdateActual	BOOL	FALSE	Update of actual values ( on each rising edge )
Input	xUpdateSetp	BOOL	FALSE	Update of setpoints ( on each rising edge )
Input	xUpdateConfigWrite	BOOL	FALSE	Update of the configuration (write access) ( on every rising edge)
Input	xResError	BOOL	FALSE	Reinitialization of the output ‘eErrorCodeCom’ (on each 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		Volumetric 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 device, FALSE = calibration in FB required)
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’	Arbitrary 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	Selection of the value to be displayed (static) (0 = standard display)
Input Const	xDisplayAvailable	BOOL	FALSE	Definition 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 calculating the volumetric flow
Input Const	rVolFlowConstant	REAL	100.0	K-factor for calculating the current volumetric 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 processes influenced by the input ‘xUpdateConfigWrite’
Input Const	tTimeUpdateSetp	TIME	TIME#0ms	Update interval for the processes affected by the input ‘xUpdateSetp’
Input Const	tTimeUpdateActual	TIME	TIME#3s0ms	Update interval for the processes affected by the input ‘xUpdateActual’