| 摘要 |
PURPOSE:To prevent a control system from having abrupt variation in a short time when data transmission is disabled by inputting the deviation value of an actual value of equipment to be controlled from a set value stored in an arithmetic device, and controlling the equipment in accordance with the deviation value. CONSTITUTION:A setter 1 on a control center side sets a valve opening extent value, a contact 7 is closed to transmit a setting confirmation number (c) by a data transmitter 2, and a setting confirmation signal (c') is outputted from the data transmitter 3 on a center side to be controlled. An arithmetic device 8 with a memory function, provided on the center side to be controlled, inputs the set value (a) of the opening extent of a valve set on the control center side and transmitted through a transmission line 12. The arithmetic device 8 stores only when the signal (c') is inputted, and outputs the set value (a). A regulating device 4 inputs the deviation value of the opening extent value (b), sent from a valve opening extent sensor 6 through a transducer 9, from the set value (a) to exercise opening and closing control over the valve through a driving motor 5. |
