Start AutoTune

Enable the control bit ZoneData.tsProcessSet.wControlWord.5 to enable AutoTune, and enable the control bit ZoneData.tsProcessSet.wControlWord.0 to start the control process.

As long the AutoTune is started, the control state machine ZoneData.tsInternalStatus.ControlState will change from Ready to AutoTune. The tune setpoint ZoneData.tsInternalStatus.rTune_SetPoint will be set internally: as long as the process set point ZoneData.tsProcessSet.rsetpoint fulfills the necessary temperature change, namely the different against actual temperature is greater than ZoneData.tsMachineSet.iTune_Step, then the AutoTune will take the process set point as tune setpoint and transfer it to the active setpoint ZoneData.tsProcessStatus.rActive_SetPoint. Otherwise it will set a higher tune setpoint, which is not lower than the HighHigh temperature limit.

AutoTune needs a long time depending on the system. If the cooling is also activated, then it will be even longer.