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.


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



Click Here to Reveal the Answer

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).




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