| 摘要 |
<p>PURPOSE: To surely prevent an influence from being exerted upon a slave controller without requiring a lot of operations at the time of a check by fixing the operating state of equipment to be controlled in a previously decided control state while a host controller is under checking. CONSTITUTION: When turning off an output to a valve 22 during the check of the host controller, an under-check signal S1-1 is outputted from a controller under-check switch 16-1 of a host controller 14-1 to an AND circuit 36 after being inverted by a signal inverter 38, and a valve control signal S3 is inputted from a valve control arithmetic part 30 to the AND circuit 36. The AND signal of the inverted signal of the under-check signal S1-1 and the valve control signal S3 is outputted to the valve 22. In this case, when the host controller 14-1 is under checking, the input to the AND circuit 36 is turned off without fail and AND is not established independently of the state of the valve control signal S3 from the host controller. Therefore, the output to the valve 22 is turned off. Thus, only by turning on the switch 16-1, valves 22, 24 and 26 can be fixed in the desired state.</p> |
