| 摘要 |
PURPOSE:To ensure a simple switch for the external output with no installation of the switch circuit at the outside by providing the output lock signals to the output modules of both the working and stand-by systems. CONSTITUTION:For both working system A and stand-by system B, output lock signal 8 is connected to output module 3' from processor module 2'. When a fault occurs in system A, the fault is informed to bus control module 1 through common bus 5. Thus module 1 gives the command for the stop of A, and signal 8 is delivered from module 2' of A to lock output 7. After this, module 1 gives the command for start of the operation of B to release signal 8 of B, and thus the output lock of module 3' is released. In this case, the output is already locked for module 3' of A. As a result, only the output of B is delivered for the system output. Accordingly, the conventional control procedure will do for module 1 to bus 5. |
