PLC Hardware Component’s?

PLC Hardware Components?

1.Power Supply

2.CPU: Central Processing Unit (Processor)

3.Base Rack or Chassis

4.Input Module

5.Output Module

In this article, I will offer a comprehensive explanation of PLC hardware, using Rockwell PLCs as an illustrative example.

1.Power Supply:

A power supply is necessary to provide power to all hardware components, including the CPU, input/output modules, and any other hardware like communication modules mounted on the chassis or base rack.

Main Types of Power Supply: AC Power Supply and DC Power Supply.

2.CPU: Central Processing Unit or Processor

It serves as the brain of the entire PLC system, constituting the most critical component. It assumes the responsibility of making decisions regarding outputs based on the input map and logic devised by the programmer.

3.Chasis or Base Rack:

A chassis is employed to mount the CPU and input/output modules. It also provides the necessary power to all the modules. The main type of chassis depends on the number of modules that can be mounted on it.

4.Input Modules:

Input modules are used to connect input devices such as push-button switches and various sensors. PLCs have dedicated modules for both analog and digital inputs. Additionally, based on polarity, digital input modules are further categorized.

Types of Input Modules:

1.Digital Input Module Types: Sink and Source.

2.Analog Input Types: Current Input and Voltage Input.

5.Output Modules:

Output modules are employed to control output devices such as motors, lamps, and relays.

Types of Output Modules:

1.Digital Output:

a. Transistor Output: It is further divided into Sink and Source Output.

b. Relay Output Module

2.Analog Output:

a. Voltage Output and Current Output.

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