| 摘要 |
PURPOSE:To urge accurate judgement for the operator, by producing suitable failure information as the system, through the addition of the function performing alarm display, by taking the condition that the back-up is not made at a failure of a specific computer. CONSTITUTION:Failure in a plurality of process computers 1, 2 are detected respectively at failure detectors 7 and 8, and the computer state signals 30C11, 30C12 are fed to the failure detection and processor 9 at the detection of failure. Further, simultaneously, the interruption signals B, B' for the switching of the switching device 4 are separately given to the computers 2 and 1. Further, the computers 1, 2 transmit the back up signals MO1, MO2 at the back-up via the process input and output device 3, and output the connection status signals K1, K2 where the switching state is put to the computer 1 or 2, to the switching device 4. Further, the processor 9 discriminates the normal back-up with each signal, and heavy failure signal ANN1 or light failure signal ANN2 is transmitted according to the result of discrimination. |
