| 摘要 |
A monitoring apparatus and method are disclosed for monitoring the occurrence of a plurality of events in a cyclical process. An event transducer detects the occurrence of such events in such process, a progress transducer detects the progress of such process, a search means searches for events by sensing whether respective events occur at expected positions in the progress of such process, and a self-delete means automatically prevents the search means from searching for a prescribed event at its expected position when such prescribed event is not sensed during a predetermined number of cycles of such process. In the preferred form, the monitored process is the cyclical operation of an endless conveyor which is automatically shut down when a rip occurs; the self-delete means reduces unnecessary nuisance shut downs.
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