PLC is divided into fixed and modular (modular) two kinds. Fixed PLC including CPU boards, I/O board, display panel, memory blocks, power supply, etc., these elements are combined into a sealed, as a whole. Modular PLC, including CPU module, I/O module, memory, or the chassis, power supply module, these modules can be according to certain rules of combination configuration.
The composition of the CPU,
Hereinafter referred to as PLC programmable controller, which is extremely rapid development