Certified Automation Professionals (CAPs) are responsible for the direction, design, and deployment of systems and equipment for manufacturing and control systems.
CAP questionIn building automation systems, which of the following is not considered to be an example of a unit-level controller?
A. fan coil unit
B. unitary zone control
C. pulse width modulation output
D. hotel room controller
Pulse width modulation is a method for controlling the output to a final control element and represents an I/O strategy, not a unit-level controller.
Reference: Sands, Nicholas P. & Verhappen, Ian, A Guide to the Automation Body of Knowledge, Third Edition, ISA Press, 2019.
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