The size of the PLC and several common name appellation of PLC

In practice, when need to make an evaluation of the size of the PLC controller, the common practice is based on what the input/output points or program memory capacity ( Number of words) As a standard of evaluation, the size of the PLC can be divided into small, medium, and large ( Or in a small, size and mass) Three categories, as shown in table 1. Table 1 size classification of PLC controller decided to store the size of the user program memory capacity of how much the number of steps or statement. Input/output points and there are internal relations between program storage capacity. When the input/output points increases, the order process increases the amount of information, process longer, and therefore need to increase the capacity of program memory. In general, the CNC lathe, milling machine, machining center and other standalone CNC equipment required for input or output points below 128 points, a few complex equipment in more than 128 points. And large nc machine tools, FMC, FMS, FA, need to be adopted in size or mass of PLC. In order to give prominence to the programmable controller as the characteristics of the industrial control devices, or personal computer in order to 'PC' or 'PLC' terms such as pulse encoder phase difference, in addition to known as programmable controller as the 'PLC', at present a lot of factories, some of which are world famous PLC manufacturers, also have adopted different other name with PLC. Is presently as follows several common name list: microcomputer programmable controller ( 微处理器可编程控制器, MPC) ; Programmable interface controller ( 可编程接口控制器, PIC） ; Programmable machine controller ( 可编程计算机控制器, PMC) , programmable sequence controller ( 可编程控制器Seguence - PSC） 。
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