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AutoQuiz: What are the Continuous Sequence of Steps Performed by a PLC?

AutoQuiz is edited by Joel Don, ISA's community manager.

Today's automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for information about the CCST program. This question is from the Level III study guide, Domain 2, Loop checking. Level III represents a professional who has a 13-year total of education, training, and/or experience.

AutoQuiz-20160715-Continuous-Sequence-of-Steps-Performed-by-a-PLC

The continuous sequence of steps or "operating cycle" performed by a PLC processor is known as:

a) updating
b) scanning
c) polling
d) rectifying
e) none of the above

 

While the PLC may in fact update values, poll devices, and rectify aspects of the process in response to data it encounters during its routine, the best term for this continuous sequence is scanning.

The correct answers is B, scanning.

 

Joel Don
Joel Don
Joel Don is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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