| 摘要 |
PURPOSE:To attain quick check and maintenance work and to improve the working efficiency, by displaying automatically a ladder wiring diagram, the contents of a fault, etc. of a basic sequence circuit at a display device in case a certain basic sequence circuit has a fault in a sequence control circuit. CONSTITUTION:A sequence control circuit is formed by providing a ladder- shaped wiring to each other among basic sequence circuits provided in response to each controlled system. Fault detecting circuits C1-Cn are provided to those basic sequence circuits, and the numeric data is transferred to a data memory 2 through transfer circuits DT1-DTn. A CPU3 works when the data is transferred to the memory 2 and transmits a signal to a CPU5 serving as a control circuit. The CPU5 reads a fault diagnosing program data out of a program memory 4. Based on this data, the ladder diagram, the fault contents, etc. of a faulty basic sequence circuit are displayed at CRT8 through a display driving circuit 7. At the same time, a printer driving circuit 12 and a sound synthesizing circuit 14 are actuated to perform printing and an aural alarm. |
