| 摘要 |
PURPOSE:To discriminate which equipment generates a fault by monitoring the fault of each control equipment by monitoring the cycle of a clock signal, which is generated when any fault is generated at each control equipment, on a monitor line with a cycle monitoring means. CONSTITUTION:When any fault is generated, a changeover switch 411 is operated, and the clock to be inputted to a terminal A is outputted to a terminal B1. Terminals B1-BN of respective cards are linked by a monitor line 5, the change point of rise is detected by a rise detection circuit 2, and interruption is generated at a CPU circuit 1. At the CPU, the cycle of the clock outputted to the monitor line 5 is measured by measuring the time of interruption generation. When the clock in a cycle T is inputted to a frequency divider 412 of a card 41 and all the cards are normal, no clock signal appears on the monitor line 5. When the fault is generated at any card K, the clock at a frequency outputted to the card preceding to that card K appears. Therefore, which card generates the fault can be discriminated by measuring the cycle of the monitor line at the CPU. |
