| 摘要 |
PURPOSE:To realize easily a maintenance operation of plural processing devices which are installed dispersively, by adopting a common bus of a double system, and using a preliminary system as a system for the maintenance operation. CONSTITUTION:A communication control device 2B which becomes an object of a program loading operation is determined, and thereafter, a maintenance managing device 1 generates a discrete selecting signal D2. The communication control device 2B inputs the discrete selecting signal D2 through a signal line 6B, and selects a common bus 4 of a preliminary system under the condition that a signal C1 on a common bus switching signal line 5 is ''0''. Subsequently, the maintenance managing device 1 selects a loading program from the inside, and loads it on the common bus 4. The communication control device 2B inputs the loading program through its common bus 4. The maintenance managing device 1 outputs a request of its face to the communication control device of a diagnostic object by using the common bus 4 of the preliminary system, receives a data required for a diagnosis, and executes the diagnosis. |
