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AutoQuiz: Which PLC Programming Languages Consist of Contacts, Timers and Counters?

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

Today's automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional's skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for information about the CAP program. The following question comes from the CAP study guide, Performance Domain IV, Development.

AutoQuiz-20161021-PLC-programming-languages-contacts-timers-counters

Which PLC programming languages consist of contacts, timers, and counters?

a) sequential function charts (SFC)
b) ladder diagram (LD)
c) function block diagram (FBD)
d) structured text (ST)
e) all of the above

The LD Language consists of relay-type logic, timing, counting, and basic math operations. SFC and FBD are graphical languages in a high level structured language.

The correct answer is B, ladder diagram (LD).

Joel Don
Joel Don
Joel Don is the community manager for ISA and 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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