# BurnerT ## `BurnerT` (FB) FUNCTION\_BLOCK BurnerT ### Short description > Control of a heat generator (temperature setpoint via temperature signal)\ > \ > Typical application: heat generation ### Representation
### Function description #### General This function block is used to control a heat generator depending on the generator's demand *xEn* and the flow setpoint temperature *rSetPtTemp*.\ The enable / disable of the heat generator is done via the output *xHB* (FALSE = lockout, TRUE = enable).\ The temperature signal is generated from the flow setpoint temperature *rSetPtTemp* using a linear characteristic defined by two points, if the heat generator is enabled (*xHB* = TRUE).\ If the heat generator is locked, the constant 0.0 is output.\ \ The following function blocks are essentially used: TwoPoint OperatingHours ManBin ManNum #### Enable / disable of the heat generator *xHB* The enabling of the heat generator (*xAB* = TRUE, *xHB* = TRUE (eManModeB = eManBin.Auto)) occurs if the heat generator demand is active (*xEn* = TRUE).\ The lockout of the heat generator (*xAB* = FALSE, *xHB* = FALSE (eManModeB = eManBin.Auto)) occurs if the heat generator demand is not active (*xEn* = FALSE). #### Temperature signal for the heat generator *rHA* The temperature signal for the heat generator is passed to the output *rAA* (and *rHA*, if eManModeN = eManNum.Auto) if the heat generator is enabled (*xHB* = TRUE).\ If the heat generator is locked (*xHB* = FALSE) the constant 0.0 is output.\ The temperature signal is generated from the flow setpoint temperature *rSetPtTemp* using a linear characteristic defined by two points and is absolutely limited to the range 0.0 - 100.0 %.\ The input characteristic is defined by the setpoints / parameters **rTwoPointX1** or **rTwoPointX2** defined.\ The output characteristic is defined by the setpoints / parameters **rTwoPointY1** or **rTwoPointY2** defined.\ The line defined by points P1 (X1 / Y1) and P2 (X2 / Y2) now allows the assignment of any flow setpoint temperatures *rSetPtTemp* to a temperature signal *rAA*.\ \ Example:\ \ Characteristic: X1 = 20.0, X2 = 90.0, Y1 = 20.0, Y2 = 100.0\ \ \&#xNAN;*rSetPtTemp* = 55.0 °C\ \ \&#xNAN;*rAA* = 60.0 % #### Manual override of the digital output *xHB* The enabling/locking of the heat generator (*xHB*) can be operated either in automatic mode (eMANBIN.Auto) or in one of the two manual modes (eMANBIN.ManOn, eMANBIN.ManOff). | *xAB* | eMANBIN | *xHB* | Notes | | ----- | -------------- | ----- | ---------------------------------------------- | | FALSE | eMANBIN.Auto | FALSE | Manual override module in automatic | | TRUE | eMANBIN.Auto | TRUE | Manual override module in automatic | | X | eMANBIN.ManOn | TRUE | Manual override module in manual operation On | | X | eMANBIN.ManOff | FALSE | Manual override module in manual operation Off | Legend: X = any #### Manual override of the analog output *rHA* The temperature signal (*rHA*) can be operated either in automatic mode (eMANNUM.Auto) or in manual mode (eMANNUM.Man). | *rAA* | eMANNUM | *rHA* | Notes | | ----- | ------------ | ------------- | ------------------------------------------ | | Value | eMANNUM.Auto | Value | Manual override module in automatic | | X | eMANNUM.Man | **rManValue** | Manual override module in manual operation | Legend: X = any #### Aggregate fault *xAlarm* The aggregate fault *xAlarm* is active (= TRUE) if the fault signal of the heat generator *xAlarmIn* is active (= TRUE).\ In all other situations the aggregate fault *xAlarm* not active (= FALSE). #### Collective automatic-mode message *xAuto* The collective automatic-mode message *xAuto* is activated ( = TRUE ) if the following conditions are met simultaneously: * Input *eAOO* = HVACTYPES.eManBin.Auto * Input *eAO* = HVACTYPES.eManNum.Auto * Setpoint / parameters **eManModeB** = eMANBIN.Auto * Setpoint / parameters **eManModeN** = eMANNUM.Auto #### Operating hours counter - heat generator The operating hours counter (*udiOperatingHours*, *udiCountFb*) for the heat generator is active when the running signal is active (*xFb* = TRUE). > **Write access to the counter values** > > Via the path 'InstanceName.\_OperatingHours.udiOperatingHours' or 'InstanceName.\_OperatingHours.udiCountFb' write access to both counters is possible. > > **Prerequisite for the use of the function block BurnerT** > > The use of the TimeRead2 function block is required for correct operation. #### Feedback of the heat generator power *rU* The current **actual** Power of the heat generator can be connected at the input *rU* .\ This input is currently not used for control and regulation purposes. #### Feedback of the manual value for the power signal from the manual override - hardware *rPoti* The feedback of the manual value can be at the input *rPoti* .\ This input is currently not used for control and regulation purposes. #### Not active state (*xEn* = FALSE) | *xHB* | *xAB* | *rHA* | *rAA* | *dtLastFb* | *udiOperatingHours* | *udiCountFb* | *xAlarm* | *xAuto* | Notes | | -------------------------------- | ----- | ------------------------------ | ----- | ---------- | ------------------- | ------------ | ------------------- | --------- | ------------- | | FALSE (eManModeB = eManBin.Auto) | FALSE | 0.0 (eManModeN = eManNum.Auto) | 0 | old value | old value | old value | State of *xAlarmIn* | old value | *xEn* = FALSE | Legend: X = any ### CODESYS InOut: | Scope | Name | Type | Initial | | ----------- | ------------------- | ------- | ------------ | | Input | `xEn` | `BOOL` | | | Input | `rSetPtTemp` | `REAL` | | | Input | `xFb` | `BOOL` | | | Input | `rU` | `REAL` | 0 | | Input | `xAlarmIn` | `BOOL` | | | Input | `eAOO` | eManBin | eManBin.Auto | | Input | `eAO` | eManNum | eManNum.Auto | | Input | `rPoti` | `REAL` | | | Output | `xHB` | `BOOL` | | | Output | `xAB` | `BOOL` | | | Output | `rHA` | `REAL` | | | Output | `rAA` | `REAL` | | | Output | `dtLastFb` | `DT` | | | Output | `udiOperatingHours` | `UDINT` | | | Output | `udiCountFb` | `UDINT` | | | Output | `xAlarm` | `BOOL` | | | Output | `xAuto` | `BOOL` | | | Input Const | `rTwoPointY2` | `REAL` | 100 | | Input Const | `rTwoPointX2` | `REAL` | 90 | | Input Const | `rTwoPointY1` | `REAL` | 20 | | Input Const | `rTwoPointX1` | `REAL` | 20 | | Input Const | `rManValue` | `REAL` | 0 | | Input Const | `eManModeN` | eMANNUM | eMANNUM.Auto | | Input Const | `eManModeB` | eMANBIN | eMANBIN.Auto |