Programmable controller PLC three categories

Abstract: three kinds of classification of programmable controller PLC information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. PLC product variety, specifications and performance are different. For the classification of the PLC, usually based on the differences of different structure forms, functions, and how much I/O points roughly classified. Classification according to the structure of PLC, the form of the structure can be P. More flow meter manufacturers choose model price quote you are welcome to inquire, here are three kinds of classification of programmable controller PLC article details. PLC product variety, specifications and performance are different. For the classification of the PLC, usually based on the differences of different structure forms, functions, and how much I/O points roughly classified. According to the classification of structure form according to the structure of PLC, the PLC can be divided into two categories, integral and modular. （ 1) Monolithic integrated PLC PLC is will power, the CPU and I/O interface components are concentrated in one case, a compact structure, small volume and low price. This kind of integral structure commonly used small PLC. Integral PLC by different I/O points of basic unit ( Also known as the host) And the expansion of units. Basic unit, CPU, I/O interface, and the expansion of the I/O expansion unit connected, and are connected to the programmer or an EPROM writer interface, etc. Extension units only I/O and power supply, etc. , there is no CPU. Basic unit and the expansion of the general use flat cable connection between units. Integral PLC general can also be equipped with special function units, such as analog unit, position control unit, etc. , to extend its function. （ 2) Modular PLC modular PLC is the PLC, each component respectively made a number of separate modules, such as CPU module, I/O module, power supply module ( Some contain in the CPU module) And all sorts of function modules. Modular PLC is made up of framework or the base plate and the various modules. Module is installed on the frame or substrate socket. The modular PLC is characterized by flexible configuration, can be selected according to need different size of system, and convenient assembly, easy extension, and maintenance. Large and medium-sized PLC adopts modular structure in general. Some PLC combined the characteristics of the integral and modular, constitute the so-called overstow type PLC. Piled up its type PLC CPU, power supply, such as I/O interface is also a separate modules, but between them is connected by cable, layers and each module can be piled up. So, not only the system can be flexible configuration, also can do small size. According to the feature classification: according to the function of PLC have different, the PLC can be divided into low, mid-range, high-grade three categories. （ 1) Low-grade PLC has the logic operation, timing, counting, shift, and the diagnosis, monitoring and other basic functions, can also have a small amount of analog input/output, arithmetic, comparison, communication and data transmission function. Mainly used for logic control, sequence control, or a small amount of analog control of single machine control system. （ 2) Mid-range PLC, besides has the function of low-grade PLC also has strong analog input/output, arithmetic operations, data transmission and comparison, system transformation, remote I/O, subroutines, communications, networking, and other functions. Some still can add interrupt control, PID control, is suitable for the complex control system. （ 3) High-grade PLC, besides has the function of a mid-range machine also added signed arithmetic operations, matrix, a logical operations and square root operations and other special functions of operations, tabulation and form transfer function, etc. High-end PLC machines have stronger communication networking, can be used for large-scale process control or constitute a distributed network control system, realizing the automation of factory. According to the I/O points classification according to the amount of PLC I/O points, PLC can be divided into three classes of small, medium and large. （ 1) Small PLCI/O points to under 256 points for small PLC. Among them, the I/O points less than 64 points of microminiature or miniature PLC. （ 2) Medium PLCI/O points to 256 points, 2048 points above the following for medium-sized PLC. （ 3) Large PLCI/O points for more than 2048 large PLC. Among them, the I/O points more than 8192 points for very large PLC. In practice, the strength of the general function of PLC and its I/O points is interlinked, namely the function of the PLC, the more the more configurable I/O points. Often, therefore, what we call the small, medium, large PLC, besides refers to its I/O points is different, also said its corresponding function for low, mid-range, high-grade. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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