Overview
This course describes the characteristics of Programmable Logic Controllers (PLCs), which perform functions that relate a set of electrical inputs to a set of electrical outputs connected to the PLC. Their use is primarily for industrial processes or tasks, but also for many other practical applications.
The goal is to convey sufficient knowledge of programming PLCs using a version of “ladder logic” language, that enables the reader to implement real applications. Toward that end we gradually introduce supporting knowledge that starts with PLC structure, description of a scan, Boolean algebra, digital gates, and finally ladder logic programming and instructions. And the method used in this process is teaching with examples, blending rather than separating theory and practice in different sections.
The course does not deal with procedures to use a specific software, such as precise syntax, downloading methods, etc., since that information can be found elsewhere, especially in the proprietary manuals and help menus of each commercial software. The course focuses on the practical aspects of translating logical relationships between inputs and outputs, into programs that work equally well in any version of the language. These relationships are the building blocks of most simple and complex solutions for industrial uses.
PLCs are widely used in practically all modern industries and processes. Accordingly, this course is designed for engineers of all disciplines even if they do not work on the plant floor. Their engineering background is sufficient for understanding and applying the contents of this course.
To receive credit for this course, the student must pass a multiple-choice quiz consisting of twenty (20) questions.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- The Ladder Logic language for programming the PLC. A list and definitions of instructions presented with examples, sufficient to get started in programming practical applications
- The functional parts of a PLC, including the major tasks carried out during the scan
- The postulates of Boolean algebra, logic gates, truth tables and relations to PLC programming, which gives a solid basis for the logical definition of applications to be programmed
- Clarification of some details of the program updating stage that are frequently overlooked and cause errors. This is shown through an example
- Advantages of the PLC over dedicated wired logic, shown with an example
Course
Click on the following link to the PDF document to review the course material before taking the quiz for credit.
Introduction to Programmable Logic Controllers
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