Programmable Logic Controller available in two type, that is Modular and Compact. Its usually depends on the customer requirement and specification for their projects or manufacturing lines. This article shows the definition and difference between modular PLC and compact PLC which is crucial in industrial automation.
What is Modular PLC?
Is built with several components that are plugged into a common rack or bus with extendable I/O capabilities. It contains power supply module, CPU and other I/O modules that are plugged together in the same rack, which are from same manufacturers or from other manufacturers. These modular PLCs come in different sizes with variable power supply, computing capabilities, I/O connectivity, etc.
Modular PLCs are further divided into small, medium and large PLCs based on the program memory size and the number of I/O features.
Modular PLCs are further divided into small, medium and large PLCs based on the program memory size and the number of I/O features.
What is the Compact PLC?
In Compact PLC, I/O capability is fixed and determined by the manufacturer. They are used for small scale uses.
A single case contains the multiple built-in modules. The integral PLC has integrated power supply, CPU, I/O interfaces and other components are housed in a compact chassis. Some of the integrated PLCs allow connecting additional I/Os.
A single case contains the multiple built-in modules. The integral PLC has integrated power supply, CPU, I/O interfaces and other components are housed in a compact chassis. Some of the integrated PLCs allow connecting additional I/Os.
Difference between Modular & Compact PLC:
Compact PLC |
Modular PLC |
Cannot be easily repaired |
Easy to maintain compared to the compact plc. |
Fixed number of I/O |
Inputs and outputs can be added to the modular PLC systems by the user. |
Integrated or Fixed PLC |
Rack PLC |
It has already fitted I/O with CPU |
Several parts are fitted with separate slots on chassis or rack or bus in this PLC. |
It is helpful for smaller apps and is best suited for home use. |
It is used for industrial purpose and also for future industrial expansion and growth. |
Low cost |
High cost compared to compact PLC. |
Small in size |
Larger in size, which includes power supply and other additional capabilities. |
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