A decanter centrifuge is defined for separating a heavy phase material from a liquid within a feed mixture. A high intrinsic atrial rate triggers a retrograde conduction detection routine when a high ventricular stimulation rate is sustained for a predetermined number of cycles during an atrial sensing mode. The TPS identifies a subset of the multiple groups that corresponds to the entries indicated in the request of the TPS client, determines to which of the identified groups the TPS client belongs using token profiles. The switching unit and the method are used in controllers.