| 摘要 |
PURPOSE:To improve the reliability in case of processing the whole system by collating and checking each decision result of a central device and a dispersed slave station processing device. CONSTITUTION:A central device 1 and station processing devices 21-24 being slave station processing devices are connected through transmission control devices 30-34 to a transmission line 2 extended like a loop. Terminal equipments 41-44 and 51-54 are connected to the station processing devices 21-24, and input informations 61-64 are transmitted to the central device 1 and managed in a lump. In case when the terminal equipments 51-54 are controlled by sending out commands 71-74 to them basing on said input informations 61- 64, a control data 3 of a result decided by an A-program 8 of the station processing devices 21-24 is transmitted to the central device 1, also the central device 1 decides it by a B-program 9, its result 10 is compared 11 with said control data 3, and only in case when they coincide with each other, it is acknowledged and sent out 12 to the station processing devices 21-24. |
