| 摘要 |
PROBLEM TO BE SOLVED: To provide a redundant control system in which availability is improved by reducing, compared to a conventional system, an occurence frequency of switching between an active system and a standby system.SOLUTION: A relay device that is connected via a network device connection bus to one of two control devices, one of which serves as an active system and the other of which serves as a standby system, and also connected to an IO network, is connected to the other control device via redundant communication means. The relay device is further connected, via an equalization cable, to the other relay device that is connected to the other control device via the network device connection bus. When a connection destination of the network device connection bus is the active system, at least one of processing for transferring monitoring data received from the IO network to the control device of the active system and processing for transferring the monitoring data to the other relay device is executed. When the connection destination of the network device connection bus is the standby system, processing for transferring the monitoring data received via the equalization cable to the control device of the active system via the redundant communication means is executed.SELECTED DRAWING: Figure 4 |
