EP003 — Knowledge Check

Five questions to check what stuck from "PLC Scan Cycle & Ladder Logic Basics." Try to answer in your head first, then reveal the answer to check yourself.

1. 01

   What are the three steps of a PLC scan cycle, in order?

   Reveal answer
2. 02

   In ladder logic, what does a coil represent?

   Reveal answer
3. 03

   In a Start/Stop/Seal-In circuit, why is the Stop pushbutton wired as Normally Closed?

   Reveal answer
4. 04

   True or False: A PLC checks its inputs continuously, in real time, during logic execution.

   Reveal answer
5. 05

   True or False: A ladder rung is evaluated left to right.

   Reveal answer