# SPLUSS\_724X\_MOD ## `SPLUSS_724X_MOD` (FB) `FUNCTION_BLOCK` SPLUSS\_724X\_MOD ### General > This is a two-channel differential pressure transmitter (incl. calculation of the volume flow, incl. 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 transmitter can optionally be equipped with a display. > The actual volume flow is calculated based on the actual differential pressure value of channel 1 > 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 | `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` | |

Indication of whether the sensors must be calibrated in the device
(TRUE = calibration in the device required, FALSE = calibration 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\_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 of 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 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 the automatic, cyclical zero-point
adjustment (TRUE = enable)

| | 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 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

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