SPLUSS_714X_MOD

SPLUSS_714X_MOD (FB)

FUNCTION_BLOCK SPLUSS_714X_MOD

General

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

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

The transducer can optionally be equipped with a display.

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 enabled/disabled via DIP switch.

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

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

InOut:

Scope	Name	Type	Initial	Comment
Input	xEn	BOOL	TRUE	Enable / disable communication ( TRUE = enabled )
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 setpoint values (on every rising edge )
Input	xUpdateConfigWrite	BOOL	FALSE	Update of the configuration (write access) ( on each rising edge)
Input	xResError	BOOL	FALSE	Reinitialization of the output 'eErrorCodeCom' (on each 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		Indicator whether the calibration of the sensors must be performed in the device (TRUE = calibration in device required, FALSE = calibration in FB required)
Output	xAlarm	BOOL		General fault ( TRUE = fault )
Output	xAlarmCom	BOOL		General 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_714X_MOD_DISPLAY_VALUE	SPLUSS_714X_MOD_DISPLAY_VALUE.Standard_Display	Definition of the value to be displayed (static) (0 = standard display = differential pressure)
Input Const	xDisplayAvailable	BOOL	FALSE	Specification whether a display is present (TRUE = display is present)
Input Const	rVolFlowHeightAboveSeaLevel	REAL	450.0	Height above sea level for calculation of 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 calibration in minutes (15.0 - 1440.0)
Input Const	xEnAutoZero	BOOL	TRUE	Enable/disable of the automatic, cyclic zero-point calibration (TRUE = enabled)
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 affected by the input 'xUpdateConfigWrite'
Input Const	tTimeUpdateSetp	TIME	TIME#0ms	Update interval for operations influenced by the input 'xUpdateSetp'
Input Const	tTimeUpdateActual	TIME	TIME#3s0ms	Update interval for operations influenced by the input 'xUpdateActual'