| 摘要 |
PURPOSE:To ensure smooth switching without imparing the continuity of monitor control when a queuing system is switched to the working side, by always confirming the state of a remote supervisory and controlling device and at the same time renewing the storage contents, the display output, etc. of the input/output control part of a monitor control board in response to the contents of the intercepted information. CONSTITUTION:A transmission control part 9A stores with replacement the result of the information transfer with a general and nondefective slave station device to the corresponding area of a memory at an input/output control part 10A and at the same time displays the result at the corresponding display area on a monitor control board 2. While a queuing system 1B also intercepts the transfer of information between a working system 1 and the slave station device via a monitor receiving part 11B and a receiving part 8B. As a result, a transmission control part 9B can store with replacement the corresponding area of a memory within an input/output control part 10B in the same way as a normal system. Therefore the coincidence is always secured between the contents of a memory within an input/output control part of the system 1B and those of a memory within an input/output control part of the system 1A, and no confusion of memory contents due to the system switching is induced. |
