| 摘要 |
The present invention provides a redundant system including a first control device, a second control device which is connected to the first control device and which serves as an auxiliary device for the first control device, and a plurality of subordinate-system communication units connected to the first control device and the second control device, wherein the first control device is provided with a storage unit and a control unit. The storage unit stores a parameter including information for specifying a monitoring target unit to be monitored for communication abnormality from among the plurality of subordinate-system communication units, and existence confirmation data of the plurality of subordinate-system communication units. The control unit switches the system from the first control device to the second control device when it can be determined that there is an existence unconfirmed unit in the plurality of subordinate-system communication units on the basis of the existence confirmation data, and when it can be determined that the existence unconfirmed unit is the monitoring target unit on the basis of the parameter. |
