| 摘要 |
PURPOSE:To prevent alarm of meaningless transmission error sent when a response of a fluid regulating valve is delayed by detecting the consecution of dissidence between a transmission data and a reception data close to a response time constant of the fluid regulating valve so as to discriminate it as the transmission error. CONSTITUTION:A data converter 3 converts control information for all terminal equipments into a serial data based on the control output from a sequence controller 2 of a center equipment 1, outputs it to an optical transmitter 4, where the data is converted into an optical signal, which is sent to an optical fiber line 9. A terminal control circuit 16 of a terminal equipment 10a discriminates it and a drive circuit 18 gives a drive output to one solenoid 12a of a solenoid valve 12. The drive current of the solenoid 12a reaches an on-current from an off-current with a prescribed time delay with respect to a control output from the drive circuit 18. As to a tentative transmission error masked by the response delay of the solenoid 12, no meaningless alarm output is sent and the proper transmission error discrimination corresponding to the communication control from the center equipment sent repetitively is applied.
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