| 摘要 |
<p>PURPOSE:To remove doubled wiring and to easily detect a failure by providing a repeater for receiving an output from a CPU by a relay and amplifying and outputting the received signal to the load side with an input circuit part, an output circuit part and a terminal board having a driving signal existence detecting/outputting mechanism. CONSTITUTION:An output from the CPU is supplied to a connector 11 in the input circuit part of the terminal board 3 of the repeater, the corresponding relay 4 is excited and the CPU output is amplified and outputted through a terminal 10 in the output circuit part. A cassette 20 corresponding to the relay 4 forms a photocoupler by one LED out of parallel LEDs and a phototransistor to display the existence of a relay driving signal and to output a driving signal existence detecting signal. Since independent input terminal board and output terminal board which are to be connected through wiring can be omitted, doubled wiring can be removed, assembling work can be easily executed and a failure can be easily and surely detected by detecting the existence of the driving signal.</p> |
