Why does the internal controller of a FCC/S 1.x.x.1 get an invalid actual temperature and how will this affect the controller?
First, check the source of the actual temperature for the controller. This depends on the settings in the ETS parameter (application -> application parameters -> temperature input).
Depending on this check the temperature sensor, the group object or the group address.
Notice:
If the actual temperature is invalid, the object 75 has the value 670760.96 °C. This means that the temperature controller is inactive and does not work.