ISA Interchange

Welcome to the official blog of the International Society of Automation (ISA).

All Posts

AutoQuiz: What Does a Symbol Depicting a Circle Inside a Box Represent?

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

20040119_01(2)

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
    jan72
  • Panel-mounted instrument
    jan73
  • Behind panel-mounted instrument, normally inaccessible to operator
    jan74
  • Auxiliary mounted instrument, normally accessible to operator
    jan75
  • Computer-controlled function
    jan76
  • Programmable logic control
    jan77
  • Shared display, shared control
    jan78
  • Shared display, shared control in primary location
    jan79
  • Computer function, primary location
    jan80
  • Programmable logic control, primary location
    jan81

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.

Connect with Joel
LinkedInTwitterEmail

 

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.

Related Posts

Companies Ramp Up Production of N95 Masks in Response to COVID-19

COVID-19 has exponentially increased the need for N95 disposable masks in hospitals and medical facilitie...
Kara Phelps Apr 3, 2020 5:15:00 AM

Newsweek Vantage Report on Cyber Risks to Critical Infrastructure: ISA's the Expert Partner

Newsweek Vantage recently published an independent report on cyber risks to critical infrastructure—and t...
Kara Phelps Mar 24, 2020 3:11:27 PM

Auto Manufacturers Could Build Ventilators: The Power of Standards in a Global Crisis

As COVID-19 shutters manufacturing plants in North America and around the world, GM, Ford, and Tesla are ...
Kara Phelps Mar 19, 2020 1:49:27 PM