In the hot runner controller, a series-connected heating of zones grouped together in so-called relay groups is possible. The number of the group is stored in the Variable RelayHeatingGroup. The follow-up group is enabled when the SetValueTemperature of all zones of a predecessor group is reached or RelayHeatingTime has expired. This allows a gentle heating-up for the plastic located in the hot runner.If the value of the Variable is 0 (or the optional Variable is not used), no heating group is selected.