The physical structure of the integral PLC ( Picture is truth)

Integral unit or box type of PLC, PLC also known as the CPU module, I/O module and power supply is placed in a box inside the casing, structure is very compact. Its small volume, low price, small PLC generally adopts integral structure. Figure 1 is FX1S series PLC of mitsubishi company. Offers a variety of different integral PLC controller I/O points of the basic unit and extension unit for users to choose, the basic unit in the CPU module, I/O module and power supply, extension units only I/O module and power supply, with flat cable connection between basic unit and extension unit. The proportion of each unit of input and output points generally is fixed, some PLC have the expansion of the total input and total output type unit. Choose different basic unit and extension unit, can satisfy the different requirements of users. Figure 1 monolithic integrated PLC PLC general equipped with many dedicated special functional units, such as analog I/O units, position control unit and communication unit, etc. , make the function of PLC controller was extended. The basic unit of the FX series, extension units and extension module at the same height and depth, but the width is different. They don't have to substrate, each module can be used at the bottom of the built-in clip card on the DIN rail, between two adjacent unit or module with flat cable connection, installed to form a neat rectangle.
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