| 摘要 |
PURPOSE:To improve the plant operating efficiency, by making it possible to transmit and receive an execution command between plural controllers and executing the sequence operation in order from the controller having the highest priority level and interlocking controllers with one another. CONSTITUTION:Plural controllers 6a, 6b-6n consist of interlock condition input circuits 8a-8n, sequence controlling circuits 9a-9n, and output circuits 10a-10n and are connected to one another through execution command accepting circuits 11a-11n and execution command circuits 12a-12n. The controller having the highest priority level checks whether other controllers are operating or not by the interlock input circuit 8 and enters into the operation immediately if they are not operating and is held till the end of operations if they are operating. Thus, the interlock of the sequence operation among plural controllers is realized with simple circuits, and the operating ratio of the plant is improved. |
