Communication control system and method for supervising a failure

摘要

It is an object of the present invention to accurately extract all failures occurring in a unit as hard signals and use the hard signals to completely cut off the faulty unit's communications for the purpose of maintaining the communications among the other units. Disclosed is a communication control system comprising a plurality of control units which are connected via a communication bus to provide bidirectional communication. A control unit detects a failure when it occurs. Upon failure detection, the control unit generates a failure detection signal, which operates a communication signal cutoff means to cut off the communication signal transmission from the control unit. In accordance with the communication signal reception state in a control unit other than the control unit in which the failure is detected, the former control unit identifies a failure occurrence in the latter faulty control unit.