| 摘要 |
PURPOSE:To prevent the error output of the various types of control devices and the like and enhance the reliability by carrying out the constant inspection of the control output and the self-inspection of the inspection circuit itself by a simple circuit construction without an answer back circuit and the like. CONSTITUTION:The output portion D02 is disposed in the control device CPU1, the control signal for driving the inspection circuit 4 is output to the control output points 2-7, 2-9 from this output portion D02, and the control signal for driving the control output auxiliary relay circuit 5 is output to the control output points 2-5-1- 2-5-n. In this circuit 4, there are provided the control permission relay 7 which turns on at the time of request of the control output, a high sensitive type auxiliary relay 8 for detecting the operative condition of the output points 2-5-1-2-5-n and an action detecting resistance 9 having the same resistance value as the coil resistances of the relays 5-1-5-n. Then, constantly the control condition of the relay circuit 5 is inspected by the circuit 4 and at the same time the circuit 4 can be self-inspected in order to prevent the error output of CPU1. |
