Which statement describes an OSR in PLCs?

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Prepare for the NRCC Instrumentation Test. Study with flashcards and multiple-choice questions, each complemented with hints and explanations. Gear up for your exam success!

Multiple Choice

Which statement describes an OSR in PLCs?

Explanation:
An OSR, or one-shot rising, creates a pulse that is true for exactly one PLC scan when its input makes a rising transition. This single-scan behavior means a downstream action is triggered once per rising edge, even if the input remains on for several scans. After that immediate scan, the OSR output returns to false, and it will only retrigger if the input goes low and then rises again. This is why the statement describing it as staying true for only one PLC scan is the best fit. It’s designed to produce a momentary trigger, not to gate the entire program or stay active for the whole PLC run.

An OSR, or one-shot rising, creates a pulse that is true for exactly one PLC scan when its input makes a rising transition. This single-scan behavior means a downstream action is triggered once per rising edge, even if the input remains on for several scans. After that immediate scan, the OSR output returns to false, and it will only retrigger if the input goes low and then rises again. This is why the statement describing it as staying true for only one PLC scan is the best fit. It’s designed to produce a momentary trigger, not to gate the entire program or stay active for the whole PLC run.

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