Programmable logic controllers can be divided into four primary parts: the power supply, the central processing unit (CPU), the programming terminal, and the ____.
A) loading terminal
B) internal relay
C) programmable logic controller
D) the I/O rack

Question

Quizplus · Accepted Answer

The I/O rack is the fourth primary part of a programmable logic controller, which houses the input/output modules used to interface with the outside world.

Programmable Logic Controllers Can Be Divided into Four Primary Parts