| 摘要 |
PROBLEM TO BE SOLVED: To provide a control system capable of improving reliability of a system by providing a two-stage protection including a malfunction prevention/protection in hardware as well as that in software. SOLUTION: A first semiconductor relay output terminal which is electrically connected, for driving, to a circuit selecting switch part capable of selecting at least a first state or a second state, is connected in series to a second semiconductor relay output terminal which is electrically connected to a central calculation device to receive an output signal from it for driving. When both the first semiconductor relay and second semiconductor relay are turned on, a circuit to an equipment which is to be controlled and connected across the output terminals of both semiconductor relays becomes closed. COPYRIGHT: (C)2006,JPO&NCIPI
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