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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.
In a typical PLC timer, what does the function of the preset value determine?
a) the resolution of the time base such as 1/10 sec or 1/100 sec
b) the length of time before the timer is energized or de-energized
c) the length of time the timer has been active
d) the on-delay or off-delay setting that determines the reset of the timer
e) none of the above
A timer preset is a programming value for the timing function. The resolution of the time base relates to accuracy. The length of time before the timer is energized or de-energized is a timer function.
The best answer is B, the length of time before the timer is energized or de-energized.