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Integrated or Compact PLC
A modular PLC
Small PLC
Medium-sized PLC
Large PLCs
1.Compact Type PLC
2.Modular Type
3.Remote Type
4.Communication CPU Unit
5.I/O Modules
Keep in mind that trying to classify PLCs into types is not easy as there is an overlap of features among them.
If we consider PLC types to be based on their size and features, they can be placed into classes: Pico or Nano, Micro, Mini, Standard, RTU, Safety, OEM, and PAC.
Some may suggest the DCS (Distributed Control System) as a type of PLC. Originally the two where more distinct, the DCS for process/batch and PID loops and PLCs generally used for discrete or on and off control. However the PLC has evolved over the years to become very powerful controllers available to perform the many of the tasks that the DCS can do. For now, I choose to exclude this one from classification in a PLC type, but you can certainly argue the case.
