SPLUSS_714X_MOD

SPLUSS_714X_MOD (FB)

FUNCTION_BLOCK SPLUSS_714X_MOD

General

This is a single-channel differential pressure transmitter (including calculation of the volume flow rate).

7148: measuring range: +/- 500 Pa (with automatic zero-point calibration) 7147: measuring range: +/- 7000 Pa (optionally with automatic zero-point calibration)

The transmitter can optionally be equipped with a display.

The Modbus interface is configured via DIP switches in the transmitter Modbus RTU Modbus address: 1 - 247 (0 = broadcast) 9600 - 38400 baud For data backup, the options 1-8-E-1, 1-8-O-1, 1-8-N-2 and 1-8-N-1 (deviating from the standard specifications) can be set.

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

The calculation coefficients for the volume flow display are not stored fail-safe without power supply. They must therefore be written again when error-free communication is resumed.

The adjustment of the differential pressure transmitter must be carried out in the device using hardware, because further derived measured variables (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 = enable)
Input	byUnitId	BYTE	0	Device address (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	Configuration update (write access) ( with every rising edge)
Input	xResError	BOOL	FALSE	Reinitialization of the output eErrorCodeCom (with every rising edge)
Inout	ModbusClient	ModbusClientBase		Client of the device
Output	rDifPressure	REAL		Differential pressure unfiltered in XXXX Pa (7147) or XXX.X Pa (7148) (selection via parameter eDeviceType)
Output	rDifPressure_1s	REAL		Differential pressure filtered 1s in XXXX Pa (7147) or XXX.X Pa (7148) (selection via parameter eDeviceType)
Output	rDifPressure_10s	REAL		Differential pressure filtered 10s in XXXX Pa (7147) or XXX.X Pa (7148) (selection via parameter eDeviceType)
Output	rVolumeFlow	REAL		Volume flow in m3/h (0.0 - 999999.0 m3/h)
Output	xSensorOffsetInDevice	BOOL		Display of whether the sensor adjustment must be performed in the device (TRUE = adjustment in the device required, FALSE = adjustment in the 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	Any text with 7 characters (fixed length) in the bottom display line (characters H - N)
Input Const	eDisplayValue	SPLUSS_714X_MOD_DISPLAY_VALUE	SPLUSS_714X_MOD_DISPLAY_VALUE.Standard_Display	Specification of the value to be displayed (static) (0 = standard display = differential pressure)
Input Const	xDisplayAvailable	BOOL	FALSE	Specification of whether a display is present (TRUE = display is present)
Input Const	rVolFlowHeightAboveSeaLevel	REAL	450.0	Height above sea level for calculating the volume flow in meters (-500.0 - +5000.0)
Input Const	eVolFlowEquationType	SPLUSS_714X_MOD_VOL_FLOW_EQUATION_TYPE	SPLUSS_714X_MOD_VOL_FLOW_EQUATION_TYPE.Rosenberg_Comefri_Gebhardt_Nicotra	Selection of the fan manufacturer to determine the formula for calculating the volume flow
Input Const	rVolFlowConstant	REAL	100.0	K factor for calculating the current volume flow (1.0 - 2000.0)
Input Const	tTimeAutoZeroIntervall	TIME	TIME#720m0s0ms	Cycle time duration for automatic zero-point adjustment in minutes (15.0 - 1440.0)
Input Const	xEnAutoZero	BOOL	TRUE	Enable / disable the automatic, cyclical zero-point adjustment (TRUE = enable)
Input Const	eDeviceType	SPLUSS_714X_MOD_DEVICE_TYPE	SPLUSS_714X_MOD_DEVICE_TYPE.Type_7148	Selection of the device type (1 = 7148 = +/- 500Pa)
Input Const	tTimeUpdateConfigWrite	TIME	TIME#0ms	Update interval for the processes influenced by the input xUpdateConfigWrite influenced
Input Const	tTimeUpdateSetp	TIME	TIME#0ms	Update interval for the processes influenced by the input xUpdateSetp influenced
Input Const	tTimeUpdateActual	TIME	TIME#3s0ms	Update interval for the processes influenced by the input xUpdateActual influenced