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Introduction to Programmable Logic Controllers - Part II AIA

Chong Chen, Ph.D., P.E.

This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

PDH Online | PDH Center

5272 Meadow Estates Drive
Fairfax, VA 22030-6658

Phone & Fax: 703-988-0088

An AIA/CES Registered Continuing Education Provider (#J681)

Course Outline

A Programmable Logic Controller (PLC) is a device that is capable of being programmed to perform control functions. The first PLC was introduced in the late 1960s to replace relay logic controls in the automotive industry. Compared to relay logic controls, the PLC's advantages include easy programming and installation, high control speed, hardware and software security, network compatibility, troubleshooting and testing convenience, and high reliability.

PLCs are currently used widely in industrial and commercial environments. They can be found in almost any manufacturing facility. There are several manufacturers of PLCs. While the instruction formats may not be the same for different brands, the hardware structures and programming concepts are very similar. This course discusses comparison instructions, math instructions and control instructions used in PLC programming.

This course includes a multiple-choice quiz at the end.

Learning Objective

At the conclusion of this course, the student will:

Course Content

This course is the second part of a two-part course on Programmable Logic Controllers. There are a total of six modules in this two-part course. Part I covers Modules 1 through 4. Part II covers Modules 5 and 6. In part I, PLC hardware structure, input/output modules, binary number and logic functions, bit instructions, timers, and counters are introduced. Part II covers comparison instructions, math instructions and control instructions used in PLC programs. Knowledgeable of the content discussed in part I is required for studying Part II.

Course Modules - Part II (PDF Format)

Module 5: Comparison Instructions and Math Instructions

Module 6: Control Instructions

The above course modules are in PDF format. You need to open or download those documents to study this course.

For your convenience or for better graphic quality, you may also download the same modules in MS Word format.

Course Modules - Part II (MS Word Format)

Module 5: Comparison Instructions and Math Instructions

Module 6: Control Instructions


1. Allen-Bradley: Advanced Programming Software User's Manual.

2. David A. Geller: Programmable Controllers Using the Allen-Bradley SLC-500 Family, Prentice Hall.

3. Colin D. Simpson: Programmable Logic Controllers, Prentice Hall.


Once you finish studying the above course content you need to take a quiz to obtain the PDH credits.

Take a Quiz

DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.