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The rack or chassis is the most important part of the modular or rack-mounted PLC system. PLC rack or chassis is a hardware assembly that plugs every communicating modules together (like input, output, CPU, power supply, communication, and additional function modules) in a single frame. In general, rack or chassis acts as a backbone of PLC system.
Different PLC brands design and manufactures different types of PLC hardware modules. Mainly, PLC hardwares are classified into three different types- compact, modular, and rack-mounted PLC.
Compact PLC:
Compact PLC type has inbuilt limited and fixed hardware modules. So, compact PLC is called as ‘fixed PLC’.
It contains only input, central processing unit (CPU), power supply (PS), output, and communicating modules.
Modular PLC:
Modular PLC type allows expansions of the PLC system through the use of additional modules.
We can add or connect the multiple modules in the hardware of the modular PLC. These several components are fitted on chassis or rack or bus with different slots.
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