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

This 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 more information about the CCST program.

The function symbol below indicates what kind of field-mounted industrial element?

a) programmable logic controller
b) computer function
c) shared display, shared control
d) discrete instrument
e) none of the above


Click Here to Reveal the Answer

The circle symbol usually represents an instrument. Here are some symbols that represent other types of instruments. (These instrument symbols are standard according to ISA S5.1).

  • Field-mounted (discrete) instrument
  • Panel-mounted instrument
  • Behind panel-mounted instrument, normally inaccessible to operator
  • Auxiliary mounted instrument, normally accessible to operator
  • Computer-controlled function
  • Programmable logic control
  • Shared display, shared control
  • Shared display, shared control in primary location
  • Computer function, primary location
  • Programmable logic control, primary location

The correct answer is c, “shared display, shared control”.

About the Editor
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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