| 摘要 |
PROBLEM TO BE SOLVED: To obtain a plant control device capable of continuing a duplexed operation without affecting to a tracking function, even when a hardware configuration such as PIO is changed.SOLUTION: A duplex control system 10 comprises: two control devices 100, 200 which can be switched each other to a main system and a sub system; and a PIO unit 300 interposed between the control devices and a target facility 1. The control devices 100, 200 comprise: hard configuration information DBs 130, 230; control logic parts 140, 240; calculation parts 1100, 1200 having memory spaces 1110, 1210 for storing plural PIO memories 1112, 1212, and tracking memories 1111, 1211; and transmission parts 120, 220. The tracking memories 1111, 1211 are arranged to an affection avoidance address, in which an address is not changed even when the number of the PIO memories is changed.SELECTED DRAWING: Figure 1 |
