| 摘要 |
PURPOSE:To obtain a reliable control signal to plant equipment by turning off the operating circuit of the plant equipment when a fault occurs to a data way and a station controller. CONSTITUTION:The station controller STC is provided with a station abnormality detector 15 and the condition of the STC is inputted; when the condition changes, a condition change communication with a computer is performed through the data way 12. Consequently, the computer 11 reads the condition of the abnormality detector 15 to grasp the condition of the STC and disconnects an automation normalcy circuit 16 immediately as abnormality processing. The abnormality of the data way 12 is detected by the STC, which cuts off a data way normalcy signal S1. Consequently, the abnormality processing is performed immediately when abnormality occurs to the data way 12 to prevent the plant equipment 13 under control from breaking down. Thus, the control signal to the plant equipment is reliable. |
