▶️ PLC Questions

AI, AO, DI, DO Questions (PLC I/O Types)

Understand the PLC I/O types with our top questions on AI, AO, DI, and DO for learning automation and control technologies

Prepare for exams with our collection of 80+ PLC MCQ questions covering programmable logic controllers, and automation concepts.

Determine the necessary PLC switch actuation status (i.e. low versus high process stimulus) to turn the yellow lamp on.

Sketch a Ladder Diagram program for this PLC to energize the lamp if the following input conditions are met.

Suppose we have a PLC connected to three pushbutton switches. Sketch a Ladder Diagram program for program example.

Suppose we have an Allen-Bradley MicroLogix 1000 PLC and two pressure switches we need to connect to it.

Question & Answer – A PLC has been programming to control the starting and stopping of a three-phase electric motor.

A PLC has been programming to control the starting and stopping of a three-phase electric motor.

Identify the problem(s) in this PLC program, and modify it so that it will work as it should.

We have a problem in one of the PLC Permissive Inputs that there is a programming mistake, do the troubleshooting.