A Normally Open Limit Switch Is Wired to an Input

question 28

Multiple Choice

A normally open limit switch is wired to an input module and programmed using XIO instruction. The instruction will be true when:

• A)power is applied and the PLC is in the run mode.
• B)the limit switch is closed.
• C)the limit switch is open.
• D)never.

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Definitions:

Convenience Sampling

A sampling technique where subjects are selected because of their convenient accessibility and proximity to the researcher.

Sampling Distribution

The likelihood distribution associated with a specific statistic derived from a random sample.

Normal Distribution

A type of continuous probability distribution for a real-valued random variable that is symmetrically bell-shaped, centered around its mean.

Sampling Error

The discrepancy between the statistical characteristics of a population and those of a sample from that population.