| 摘要 |
PURPOSE:To prevent a system from going down by replacing one module for processing, if its malfunction is detected, with another module contained in the same processor having the module. CONSTITUTION:A trouble detection module 2, a main relay input converter module 3 having the same hardware as that of the module 2, a main relay calculating module 4, a sequence processing module 5, doubled digital input/ output module 7a, 7b are connected to a system bus 11. The modules 2 and 3 back up each other in case of a trouble. A processor 41 of the module 4 and a processor 33 of the module 3 back up each other. A CPU II 44 of the module 4, a CPU II 54 of the module 5, a CPU I 51 of the module 5 and a CPU I 71a of a module 7a back up each other. |
