| 摘要 |
PURPOSE:To surely detect the abnormality of a processor set at the remote side by transmitting a 2nd communication signal only with a factor of an abnormal state. CONSTITUTION:An inter-device communication means 1 sets the communication data received from the processor of the remote side at a communication register 102 and opens an AND circuit 107 for transmission of a received signal 12 after detecting the communication given to its own device via a comparator 106. A timer 2 is reset and started by the signal 12 and at the same time a communication reception factor flag 301-4 is set. When a communication receiving factor is eliminated, a communication processing microprogram start means 302 is started for production of a microinstruction which gives a stop instruction to the timer 2. In case the communication receiving factor is not eliminated even after a prescribed time, the timer 2 transmits a time-out signal 21 to a communication control circuit 105. The circuit 105 selects a communication code instructing the interruption of communication out of a code generating part 104 and produces a signal for selection of the output of said code as well as the transmitter device number and its own device number. Then the communication code is sent to a bus 01 from a transmission selector 103.
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