| 摘要 |
PROBLEM TO BE SOLVED: To suppress unnecessary switching between an active system and a standby system in a redundant control system in the case where communication between an active system control device and a standby system control device becomes in a disabled state.SOLUTION: Network devices 200A and 200B perform communication for equalizing monitoring data via an equalization cable 400. Control devices 100A and 100B perform communication for equalizing control data via the equalization cable 40. The control device 100B of the standby system monitors a state of the active system through the communication via the equalization cable 40. When the control device 100B detects disconnection of the communication via the equalization cable 40, the network device 200B of the standby system performs control for suppressing the control device 100B from switching from the active system to the standby system, on the basis of information acquired through the communication via the equalization cable 400.SELECTED DRAWING: Figure 1 |
