| 摘要 |
PURPOSE:To make it possible to maintain only the faulty system without removal of a cable and to restrain many interrupts for transient operations to only one, by providing a diode group and a relay connected to the cable for cross call. CONSTITUTION:At a system fault time, switch 400-1 breaks the faulty system power source to inactivate relay 300-1, and contact 300-1b is closed to earth cable 200 for cross call through diodes D11-D1n. At this time, if break of power source Vc1 of input circuit 4-1 and power source Vc2 of signal distributor 3-1n is sequence, contact 300-1b is first closed even if the output of circuit 4-1 is unstable. Then, even if power is supplied again to input a testing false interrupt signal to circuit 4-1, no interrupt input is caused to computer 2-2 in another system. Next, when the fault of system 1-1 is recovered, power source Vc2 is made to activate relay 300-1, and contact 300-1b is opened, and as the result, cable 200 is used effectively again. |
