According to the hardware of PLC structure classification method

According to the structure of PLC can be divided into integral PLC, PLC, piled up type PLC module type three categories. 一个。 Integral PLC PLC, it is the part of container within a chassis, input, output, terminals and power into the line, respectively, in the case of upper and lower sides, and a corresponding light-emitting diode display input/output state. Panel on the left a programmer of socket, EPROM memory, the interface of the expansion unit socket outlet, etc. Programmer and the host is separation, after the programming can remove the programmer. Programmable controller with the structure compact structure, small volume and low price. Monolithic structure commonly used small PLC. Mitsubishi FX1S series PLC as shown in figure 2. b。 Modular PLC input/output points is more big, medium, and part of the small PLC adopts modular structure. Modular PLC adopt the way of building blocks overlap system, easy to expand, the CPU, input, output, power supply and so on are independent modules, power supply is included in the CPU module of PLC. PLC by the framework and each module, each module is inserted in the corresponding slot, through the bus connection. PLC manufacturers have different slot number framework for users to choose. Users can choose different grades of CPU module, a great variety of I/O module and other special modules, hardware configuration and flexible module is very convenient also changed during maintenance. Using this structure form of SIEMENS S5 and S7 - series The series 300, series 400, OMRON C500, C1000H, C2000H and small CQM series, etc. As shown in figure 3 for mitsubishi MELSEC - The appearance of Q series PLC. c。 Piled up the above two kinds of structure type PLC have distinguishing feature each, integral PLC, compact structure, easy installation, small volume, easy to and accused of equipment one, but sometimes the system configuration of input and output points can't be make full use of, and different, the size of the PLC controller, not easy to install and tidy; Modular PLC points flexible configuration, but the size is larger, it is hard to become an organic whole repeatedly with small devices. Therefore developed overstow type PLC, it absorbed the advantages of integral and modular PLC, the basic unit, extension units, such as higher wide, base plate, they do not use with flat cable connection, only after closely assembled to form a neat small cuboid, and the input and output points of configuration is flexible. With extension of PLC, the extended structure is piled up of PLC, as shown in figure 4 of mitsubishi FX2N series PLC figure shape.
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