MASTER SLAVE COMMUNICATION SYSTEM AND MASTER SLAVE COMMUNICATION METHOD

摘要

To provide a master slave communication system in which one master and a plurality of slaves are connected through a serial transmission path and control data is exchanged between the master and the slaves, and a communication cycle is not fluctuated even when the exchange of the control data fails and is retried. The communication control unit (130) of a master device (1) registers a slave which detects a communication malfunction during the exchange of the control data, and carries out retransmission to the slave which detected the communication malfunction, if the time for the retransmission remains within the communication cycle.