| 摘要 |
PROBLEM TO BE SOLVED: To prevent a system from being adversely affected by noise by detecting the timing not causing malfunction even in the case of receiving the noise at another module under on-line working on the side of noise reception, and electrically disconnecting an exchange object module at that timing. SOLUTION: A connection/disconnection timing detection part 22 is connected to a system bus 10 and a bus switch control part 21. When electric connection/ disconnection is performed by operating a bus switch 20, generally, the noises are generated on wiring or a module 30 connected to the electric junction. At such a time, the timing detection part 22 detects the timing not causing malfunction even when the other module connected to the system bus 10 receives the noise generated in the case of electric connection/disconnection of the bus switch 20 in confirming with an ejection request signal 23 of the module 30, and reports that timing to the bus switch control part 21 and after the bus switch 20 is turned off, an ejection enabling signal 24 of the module 30 is outputted. |
