The time required for the PLC to complete one scan (read inputs, solve logic, and update outputs) is called the scan time. A typical value for scan time is in the order of ____.
A) 20 msec
B) 20 ns
C) 20 $\mu$s
D) 20 seconds

Question

Quizplus · Accepted Answer

A typical value for scan time is in the order of milliseconds, and 20 milliseconds is a reasonable value for many PLC applications. The other options, such as nanoseconds or seconds, are too fast or too slow for typical PLC scan times. The third option is also not a valid unit of time.

The Time Required for the PLC to Complete One Scan μ\muμ

The Time Required for the PLC to Complete One Scan $\mu$