> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/codesys-hvac/en/hvac-modbus-library/functionblocks/grundfos/grundfos_magna_3_mono.md). # GRUNDFOS\_MAGNA\_3\_MONO ## `GRUNDFOS_MAGNA_3_MONO` (FB) `FUNCTION_BLOCK` GRUNDFOS\_MAGNA\_3\_MONO ### 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 | `xEnPump` | `BOOL` | FALSE | Enable / disable the pump (FALSE = Off, TRUE = On) | | Input | `xOverride_Max` | `BOOL` | FALSE |

Enable / disable override - Maximum mode (
FALSE = Off, TRUE = On)

| | Input | `xOverride_Min` | `BOOL` | FALSE |

Enable / disable override - Minimum mode (
FALSE = Off, TRUE = On)

| | Input | `xResErrorWarn` | `BOOL` | FALSE |

Signal for resetting alarms / warnings (rising
edge)

| | Input | `rSetp` | `REAL` | 0.0 |

Setpoint - Pump (unit/value range depending on operating mode
)

| | Inout | `ModbusClient` | `ModbusClientBase` | | Client of the device | | Output | `eForceModeFb` | Grundfos\_OperationMode | | Current pump operating mode (forced control) | | Output | `eOperationModeFb` | Grundfos\_ControlStatFb | | Current pump operating mode (control / regulation) | | Output | `wOperationStatFb` | `WORD` | | Current operating status | | Output | `xOperation` | `BOOL` | | Current operating message of the pump (FALSE = Off) | | Output | `rSetpFb` | `REAL` | | Feedback of the current setpoint in XXX.XX percent | | Output | `rProcessFb` | `REAL` | | Actual value of the controlled variable in percent | | Output | `rRelativePerfor` | `REAL` | | Current relative utilization in XXX.XX percent | | Output | `rSpeed` | `REAL` | | Current pump speed in XXX rpm | | Output | `xMaxSpeed` | `BOOL` | | Operation of the pump at maximum speed (TRUE = On) | | Output | `xMinSpeed` | `BOOL` | | Operation of the pump at minimum speed (TRUE = On) | | Output | `rFrequency` | `REAL` | | Current frequency of the FU in XX.X Hz | | Output | `rPressure` | `REAL` | | Current actual pressure value in XX.XXX bar | | Output | `rDiffPressure` | `REAL` | |

Current differential pressure actual value (inlet, outlet) in
XX.XXX bar

| | Output | `rRemotePressure1` | `REAL` | | Current external actual pressure value 1 in XX.XXX bar | | Output | `rFlow` | `REAL` | | Current flow rate in XX.X m3/h | | Output | `rFluidTemp` | `REAL` | | Current temperature in the medium in XXX.XX degrees Celsius | | Output | `rRemoteTemp2` | `REAL` | | Current external temperature 2 in XXX.XX degrees Celsius | | Output | `xSensorOffsetInDevice` | `BOOL` | |

Indication whether the sensors must be calibrated in the device
(TRUE = calibration in the device required, FALSE = calibration in
the FB required)

| | Output | `rElecCurrent` | `REAL` | | Current electrical input current in XX.X A | | Output | `rDCVoltage` | `REAL` | | Current electrical voltage in the intermediate circuit in XXX.X V | | Output | `dwElecPower` | `DWORD` | | Current electrical input power in XXX W | | Output | `rElectronicTemp` | `REAL` | | Current temperature of the electronics in XXX.XX degrees Celsius | | Output | `dwOperatingHours` | `DWORD` | | Current number of operating hours in XXX h | | Output | `dwElecEnergyTotal` | `DWORD` | | Total electrical energy consumed in XXX kWh# | | Output | `dwNumberOfStarts` | `DWORD` | | Current number of switch-ons | | Output | `rDiffTemp` | `REAL` | |

Current differential temperature (flow temperature -
return temperature) in Kelvin

| | Output | `dwPowerHeating` | `DWORD` | | Current thermal output in the heating circuit in XXX W | | Output | `dwHeatEnergyTotal` | `DWORD` | | Total heat quantity in XXX kWh (non-resettable) | | Output | `dwHeatVolumeTotal` | `DWORD` | |

Total water volume in heating operation in XXX.XX m3 (non-
resettable)

| | Output | `dwCoolEnergyTotal` | `DWORD` | | Total cooling quantity in XXX kWh (non-resettable) | | Output | `dwCoolVolumeTotal` | `DWORD` | |

Total water volume in cooling operation in XXX.XX m3 (non-
resettable)

| | Output | `xAccessMode` | `BOOL` | | Current source for operation (TRUE = REMOTE = MODBUS) | | Output | `xWarningDevice` | `BOOL` | | Collective warning - device (TRUE = warning) | | Output | `xAlarm` | `BOOL` | FALSE | Collective fault (TRUE = fault) | | Output | `xAlarmCom` | `BOOL` | FALSE | Collective fault - communication (TRUE = fault) | | Output | `eErrorCodeCom` | ModbusErrorCode | | Error code - communication (0 = no error) | | Output | `wErrorCodeDev` | `WORD` | 0 | Error code - device (0 = no error) | | Output | `wWarningCodeDev` | `WORD` | 0 | Warning code - device (0 = no warning) | | Output | `xBusy` | `BOOL` | | Communication indicator (TRUE = communication) | | Input Const | `rRemoteTemp2Offset` | `REAL` | 0.0 |

Constant measured value offset for the transmitted temperature
actual value

| | Input Const | `rRemotePressure1Offset` | `REAL` | 0.0 |

Constant measured value offset for the transmitted pressure -
actual value

| | Input Const | `xEnWatchdog` | `BOOL` | FALSE |

Influence: Outputs: rRemotePressure1
Enable / disable the communication watchdog
FALSE = disable / TRUE = enable
When the watchdog is enabled, after a period of 5 s (fixed, not adjustable) in which no Modbus telegram has been received, switching to LOCAL mode occurs
When the watchdog is enabled, address 12 is therefore updated cyclically at an interval of 2.5 s to reliably avoid triggering the watchdog.

| | Input Const | `eOperationMode` | Grundfos\_ControlStatFb | 0 |

Pump operating mode (control / regulation)
0 = speed control

| | Input Const | `xRemoteAccess` | `BOOL` | TRUE | Enable / disable local operation | | Input Const | `tTimeUpdateSetp` | `TIME` | TIME#45s0ms |

Update interval for the operations that are influenced by the input
xUpdateSetp influenced

| | Input Const | `tTimeUpdateActual` | `TIME` | TIME#3s0ms |

Update interval for the operations that are influenced by the input
xUpdateActual influenced

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