| 摘要 |
PURPOSE:To shorten the fault retrieving time by providing a circuit abnormality deciding means to a data processor in order to limit the faulty areas in a loop type circuit network. CONSTITUTION:A data processor 1 conostitutes a loop circuit network via a transmission line 1'-, a data processor 3, a transmission line 3'- and a transmission line 5' respectively. If an abnormality of the circuit arises, the input of a detection part 9 does not exist any more. Then the output 9' is produced after a set time, and a production part 10 produces a circuit abnormality message. This message is transmitted to a transmission line via a conversion part 11 and a driver 12. A detection part 16 monitors a reception message as the output of the part 14 and delivers the transmitter discrimination information in the detected circuit abnormality message to a display part 17 of a circuit abnormality transmitter to transmit it to a monitor operator. |
