Modular structure and features of PLC

Large and medium-sized PLC controller ( Such as Siemens S7 - And S7-300 The 400 series) Generally adopts modular structure. Modular way of PLC with the building blocks of system, it is composed of frame and module ( As shown in figure 2-3 2) 。 Socket module in the module, which is welded on the frame of bus connection board, some manufacturer will frame referred to as the substrate. PLC manufacturers have different slot number of the frame for the user choice, if a rack can hold the selected module, can add one or several extended frame, each frame are connected with the I/O extension cable, some PLC controller through the interface module connected to the frame. The user can choose different grades of CPU module, a great variety of I/O module and special function module, bigger to the choice of the hardware configuration, maintenance is also easy to replace the module. Some modular PLC controller ( Such as Siemens S7 - The 300 series PLC) No frame, each module is installed on the aluminum rail, between the adjacent modules with u-shaped bus connector under the module connection.
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