| 摘要 |
PURPOSE:To put a high-order logic circuit, etc., in normal operation and to recover a fault without stopping a conveyance system by generating a passage false signal if the fault occurs to some of plural article passage detection sensors. CONSTITUTION:Four sensors A-D are arranged longitudinally along an article conveyance path. Passage signals (a)-(d) are inputted to a four-input selector 11. The selecting operations for the 4-input selector 11 and four two-input selectors 14-17 are controlled according to a selection command received from the central processing unit of a host device according to the fault generation states of the sensors A-D. At this time, if the sensor C, for example, becomes faulty, the passage signal of its front stage is outputted as an output beta to the two-input selector 15 and passed through the selector 11 to becomes an input (e) to a variable delay circuit 12, thereby outputting a false signal e'. Consequently, the normal operation of a logic circuit can be carried on, so the fault can be recovered without stopping the conveyance system.
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