PLC Basics
A Programmable Logic Controller (PLC) is a computer that is designed to be used in industrial applications. The PLC has a specialized operating system that carries out a set of user instructions over and over again. This course will discuss what a PLC is as well as common PLC components and applications.
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Learning Objectives
- State the purpose of a PLC
- Describe the hardware elements that make up a PLC
- Describe the operation of a PLC
- Differentiate between the operational modes of a PLC
- List different techniques for programming a PLC
- List the advantages of ladder logic
- Describe the purpose of a rung in ladder logic
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video, MobileReady |
| Based on: | Industry Standards and Best Practices |
Key Questions
What does PLC stand for?
PLC stands for Programmable Logic Controller.
What are the main components of a PLC?
PLCs have many different physical implementations but all have the same conceptual layout. The main components of any PLC include an input module, a central processing unit (CPU), an output module, and a power supply.
Can PLCs be used for different industries?
Yes. PLCs are used in a variety of industries and come in many different forms and sizes to accommodate the needs of the user. This can take the form of small, hand-sized, single-enclosure units to larger, more modular units for industrial processes.
What is Ladder Logic?
Ladder logic is a programming language based on the electrical ladder-like schematic diagrams that were used to describe electromechanical relay logic. Ladder logic provides a visual representation of the logic flow which helps with both initial programming and subsequent troubleshooting.
Sample Video Transcript
PLC input modules accept electrical inputs from process components in the field, and convert that information into a computer compatible data file. Historically, PLCs have dealt with logical binary information such as whether something is running or not running, whether a switch or relay is open or closed. Digital input cards usually apply a technique, such as optical isolation, to prevent any line-level voltages coming into the module from damaging low voltage circuitry in the module. While working with digital signals is a large part of what PLCs do, they can also work with analog signals. Analog input cards use A/D converters to convert electrical input signals into scaled computer-compatible digital values. Each input card has a set of input terminals and a set of LEDs that indicate the status of each input channel.
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