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Using Programmable Controllers part 1

Programmable controllers have many advantages due to ease of programming, wiring, installation, and changing. They cover a wide range of sizes, but generally carry the same components:

  • processor (CPU)
  • rack or mounting
  • input assembly
  • output assembly
  • power supply
  • programming unit or device

In this post we will cover the basic functions of the CPU and Rack/Mounting involved with PLC components.

Central Processing Unit (CPU)

The CPU is essentially the brain of the Programmable Controller. The type and size of the CPU determines the programming functions available, size of the application logic, the amount of memory available, as well as the overall processing speed.

Rack Assembly

In almost every medium to large PLC system, they are assembled so that the individual components are held together as modules within a rack. On the other hand, smaller PLC systems contain all of these components within a single housing (also known as a “brick”or “shoebox”).

In our next post, we will cover information regarding input and output assembly. Excess Equip carries a large selection of PLC Components that can be found here. Please feel free to call us with any questions you might have. We also carry more items than what is listed on the site, so do not hesitate to contact us if you cannot find what you’re looking for – we would be happy to help!