# Fan1Speed ## `Fan1Speed` (FB) FUNCTION\_BLOCK Fan1Speed ### Short description > Control of a single-stage fan\ > Additional functions: air shortage monitoring, operating monitoring, maintenance switch, manual override, status indicator\ > Typical application: control of a room exhaust fan ### Representation
### Interfaces #### Inputs | Name | Data type | Value range | Initial value | Function | | ---------- | ----------------- | ------------------------------------------------------------------------- | ---------------------- | -------------------------------------------------------------------------- | | *xEn* | BOOL | | | Fan request | | *xForce* | BOOL | | FALSE | Forced override after manual override | | *xFb* | BOOL | | | Fan running indication | | *xPFb* | BOOL | | | Air shortage indication | | *xMSwitch* | BOOL | | TRUE | Maintenance switch indication | | *xAlarmIn* | BOOL | | | Fan fault indication | | *eAOO* | HVACTYPES.eManBin | HVACTYPES.eManBin.Auto, HVACTYPES.eManBin.ManOff, HVACTYPES.eManBin.ManOn | HVACTYPES.eManBin.Auto | Operating mode of manual override - hardware | | *xQuit* | BOOL | | FALSE | Reset of fault indications (operating monitoring, air shortage monitoring) | #### Outputs | Name | Data type | Value range | Initial value | Function | | ------------------- | --------------- | ----------- | ------------- | -------------------------------------------- | | *xHB* | BOOL | | | Release - fan after manual override | | *xAB* | BOOL | | | Release - fan before manual override | | *xAlarmFb* | BOOL | | | Operating monitoring fault indication | | *xAlarmPFb* | BOOL | | | Air shortage monitoring fault indication | | *dtLastFb* | DATE\_AND\_TIME | | | Date / time of the last operation of the fan | | *udiOperatingHours* | UDINT | | | Operating hours of the circulation pump | | *udiCountFb* | UDINT | | | Number of starts of the circulation pump | | *xAlarm* | BOOL | | | Collective fault indication | | *xAuto* | BOOL | | | Collective automatic-mode message | #### Setpoints / parameters | Name | Data type | Value range | Initial value | Function | | --------------------- | --------- | ------------------------------------------- | ------------- | ------------------------------------------------------------------ | | **udiPFbControlTime** | UDINT | 1 to 3600s | 60s | Reporting delay of the air shortage monitoring | | **xPFbControl** | BOOL | | TRUE | Enable of the air shortage monitoring | | **xAlarmControl** | BOOL | | TRUE | Influence of *xAlarm* on *xAB* | | **udiFbControlTime** | UDINT | 0 … 300s | 60s | Reporting delay of the operating monitoring | | **xFbControl** | BOOL | | TRUE | Enable / disable of the operating monitoring | | **xForceOption** | BOOL | | FALSE | State of the output *xHB* during forced override | | **eManModeB** | eMANBIN | eMANBIN.Auto, eMANBIN.ManOff, eMANBIN.ManOn | eMANBIN.Auto | Operating mode of the manual override for the digital output *xHB* | ### Function description #### General This function block controls a single-stage fan.\ The following function blocks are essentially used: * AirShortage * ManBin * OperatingHours #### Release - fan before manual override *xAB* The release - fan before manual override *xAB* is influenced by the fan request *xEn*, the collective fault indication *xAlarm*, the maintenance switch indication *xMSwitch*, the parameter **xAlarmControl** and the air shortage monitoring.\ \ The release - fan before manual override *xAB* is active (= TRUE) if the following conditions are present simultaneously:\ \ Case 1:\ \ \&#xNAN;*xEn* = TRUE (request active)\ \&#xNAN;*xMSwitch* = TRUE (motor protection switch not tripped)\ **xAlarmControl** = FALSE (collective fault indication not considered)\ \ Case 2:\ \ \&#xNAN;*xEn* = TRUE (request active)\ \&#xNAN;*xAlarm* = FALSE (collective fault indication not active)\ \&#xNAN;*xMSwitch* = TRUE (motor protection switch not tripped)\ **xAlarmControl** = TRUE (collective fault indication considered)\ \ In all other situations the release - fan before manual override *xAB* not active (= FALSE). #### Release - fan after manual override *xHB* The release - fan before manual override *xHB* corresponds to the release - fan before manual override *xAB*, additionally extended by a manual override module and by a forced override. | *xAB* | **eManModeB** | *xForce* | **xForceOption** | *xHB* | Notes | | ----- | -------------- | -------- | ---------------- | ----- | ---------------------------------------------- | | FALSE | eMANBIN.Auto | FALSE | X | FALSE | Manual override module in automatic | | TRUE | eMANBIN.Auto | FALSE | X | TRUE | Manual override module in automatic | | X | eMANBIN.ManOn | FALSE | X | TRUE | Manual override module in manual operation On | | X | eMANBIN.ManOff | FALSE | X | FALSE | Manual override module in manual operation Off | | X | X | TRUE | FALSE | FALSE | Forced override Off | | X | X | TRUE | TRUE | TRUE | Forced override On | Legend: X = any #### Maintenance switch indication *xMSwitch* *xMSwitch* = TRUE: maintenance switch has not been triggered (normal state)\ \&#xNAN;*xMSwitch* = FALSE: maintenance switch has been triggered (fault state) #### Forced override *xForce* The forced override acts directly on the output *xHB*. The parameter **xForceOption** determines which state the output *xHB* assumes when TRUE at the input *xForce* . #### Operating hours and switching cycles The number of operating hours and switching cycles are recorded (= counting process active) if the fan running indication *xFb* is active and at the same time the collective fault indication *xAlarm* is not active (= FALSE).\ The results are available at the counter outputs **udiOperatingHours** and **udiCountFb** available. > **Write access to the counter values** > > Via the path 'InstanceName.\_OperatingHours.udiOperatingHours' or 'InstanceName.\_OperatingHours.udiCountFb' write access to both counters is possible. #### Date / time of the last operation of the fan *dtLastFb* At the output *dtLastFb* the current date / time is available during the counting process.\ At the output *dtLastFb* the date / time at the end of the last counting process is available outside the counting process.\ At the output *dtLastFb* the initialization value DT#1970-1-1-0.0.0 is output before the first counting process. #### Operating monitoring The operating monitoring can be enabled (= TRUE) or disabled (= FALSE) by the setpoint / parameter **xFbControl** When monitoring is disabled the operating monitoring fault indication *xAlarmFb* is always disabled (= FALSE).\ When monitoring is enabled the operating monitoring fault indication *xAlarmFb* is activated (= TRUE) if the following conditions are present simultaneously for a minimum duration **udiFbControlTime** as follows:\ \ \&#xNAN;*xHB* and *xFb* = not equal (enable state and operating state do not match)\ \&#xNAN;*eAOO* = HVACTYPES.eManBin.Auto (manual override - hardware in automatic)\ \&#xNAN;*xFbControl* = TRUE (operating monitoring is enabled)\ \ The operating monitoring fault indication *xAlarmFb* is reset (= FALSE) if at least one of the following conditions is met:\ \ \&#xNAN;*eAOO* = HVACTYPES.eManBin.Auto (switch back to automatic operation of the manual override - hardware)\ \&#xNAN;*xQuit* = TRUE (reset of fault indications is active)\ \&#xNAN;*xFbControl* = FALSE (operating monitoring disabled) #### Air shortage monitoring It serves to detect an air shortage situation by evaluating the signals at the inputs air shortage indication *xPFb* and the fan running indication *xFb*.\ The air shortage monitoring can be enabled (= TRUE) or disabled (= FALSE) by the setpoint / parameter **xPFbControl** In the disabled state the output - fault indication *xAlarmPFb* is not activated (= FALSE).\ \ The output - fault indication *xAlarmPFb* is activated (*xAlarmPFb* = TRUE) if the conditions 1 and 2 below are both met simultaneously.\ \ Condition 1: The input for the differential pressure switch *xPFb* remains for at least the waiting time *udiPFbControlTime* permanently in the state FALSE (= air shortage situation).\ \ Condition 2: The running indication for the fan *xFb* remains for at least the waiting time *udiPFControlTime* remains permanently in the state TRUE (= fan in operation).\ \ \ The output - fault indication *xAlarmPFb* is deactivated in the following cases (*xAlarmPFb* = FALSE):\ \ Case 1: Conditions 1 and / or 2 are not met and the reset of the fault indication *xQuit* is active (= TRUE). #### Collective fault indication *xAlarm* The collective fault indication is activated (= TRUE) if at least one of the following described conditions is met.\ \ \&#xNAN;*xAlarmIn* = TRUE (fan fault indication is active)\ \&#xNAN;*xAlarmFB* = TRUE (error from the operating monitoring)\ \&#xNAN;*xAlarmPFb* = TRUE (error from the air shortage monitoring)\ \&#xNAN;*xMSwitch* = FALSE (maintenance switch has been triggered)\ \ In all other cases the collective fault is not active (= FALSE). #### Collective automatic-mode message *xAuto* The collective automatic-mode message *xAuto* is activated (= TRUE) if the input *eAOO* has the value HVACTYPES.eManBin.Auto and the setpoint / parameter **eManModeB** has the value eMANBIN.Auto.\ In all other cases the collective automatic-mode message *xAuto* is not activated (= FALSE). ### CODESYS InOut: | Scope | Name | Type | Initial | | ----------- | ------------------- | ------- | ------------ | | Input | `xEn` | `BOOL` | | | Input | `xForce` | `BOOL` | FALSE | | Input | `xFb` | `BOOL` | | | Input | `xPFb` | `BOOL` | | | Input | `xMSwitch` | `BOOL` | TRUE | | Input | `xAlarmIn` | `BOOL` | | | Input | `eAOO` | eManBin | eManBin.Auto | | Input | `xQuit` | `BOOL` | FALSE | | Output | `xHB` | `BOOL` | | | Output | `xAB` | `BOOL` | | | Output | `xAlarmFb` | `BOOL` | | | Output | `xAlarmPFb` | `BOOL` | | | Output | `dtLastFb` | `DT` | | | Output | `udiOperatingHours` | `UDINT` | | | Output | `udiCountFb` | `UDINT` | | | Output | `xAlarm` | `BOOL` | | | Output | `xAuto` | `BOOL` | | | Input Const | `udiPFbControlTime` | `UDINT` | 60 | | Input Const | `xPFbControl` | `BOOL` | TRUE | | Input Const | `xAlarmControl` | `BOOL` | TRUE | | Input Const | `udiFbControlTime` | `UDINT` | 60 | | Input Const | `xFbControl` | `BOOL` | TRUE | | Input Const | `xForceOption` | `BOOL` | FALSE | | Input Const | `eManModeB` | eMANBIN | eMANBIN.Auto | Methods: > mQuit > mResetOperatingHours Structure: * mQuit (Method) * mResetOperatingHours (Method)