The classification standard and basic types of PLC

Programmable controller type many, can be classified from different angles: 1 scale according to the control points and control refers to the amount of control switch into the scale, the quantity of points and the control simulation is die, die out, or both, Closed-circuit system) In the way. But the main switch meter. Analog route can be converted into a switch point, roughly equivalent to 8 to 16 points all the way. According to this point, the PLC can be roughly divided into micro, small and medium-sized machine and the mainframe, very large machine. The single-chip control point only a few points for OMRON CPM1A series PLC, Siemens Logo only 10 points. Minicomputer control points can reach more than 100 points. Such as OMRON company C60P of up to 148 points, 256 points CQM1. Germany's Siemens S7 - 200 machine can reach 64 points. Medium-sized machine control points can reach nearly 500 points, that thousands of points. Such as OMRON company's C200H machine normal configuration up to more than 700 points, C200Ha machine can reach more than 1000 points. Germany's Siemens S7300 machine up to 512 points. Mainframe control points is in commonly 1000 points above. Such as OMRON company C1000H, CV1000, local configuration of up to 1024 points. C2000H, CV2000 local configuration of up to 2048 points. Super-large machine control points can be put into points that tens of thousands of points. Such as the United States GE company's 90-70 machine, its points to 24000 points, also can have 8000 analog of the road. Then modicon company PC - E984 - such as the United States - 785 machine, its switch measuring tool for a total of 32 k ( 32768). 2048 road, analog. SS - 115 - u - CPU945 of Siemens, the switch quantity up to 8 k total points, also can have 512 analog. And so on. Above this classification is not strict, just roughly, the purpose is to facilitate system configuration and use. Generally speaking, according to the actual I/O points, all fell on the different range, the corresponding models, high cost performance must; On the contrary, certainly be worse. Naturally, there are special circumstances. Such as control points is not very much, don't have to use mainframe, but because of its special mainframe control unit, can be hot standby configuration, and adopted the mainframe. 2 according to the structure of PLC controller can be divided into two categories, housing type and module type. For box type more microcomputers, minicomputers, but from the development trend of minicomputer also gradually developed into the module type. Such as judged by the company, the original minicomputer is box type, now CQM1 is modular. Case of PLC to power, the CPU, memory, I/O system are integrated in a small enclosure. A host body is a complete PLC, can be used to achieve control. Control points does not need, you can connect extension box again, by the main body and the expansion of several boxes of large system, in order to realize the control of the more points. Modular PLC is divided into several modules according to the function, such as CPU module, input module, output module, power module and so on. Mainframe module function more single, so the type of module is relatively more. This also is the trend. At present, some medium-sized machine, the function of the module, tend to be a single, township species are also increased. C20 series PLC, such as the same OMRON company H machine CPU unit contains the power supply, the electricity supply and Ha machine is separated, has a separate power supply module. Module function is more onefold, more variety, can facilitate the system configuration, make the PLC can make more, to achieve higher use efficiency. By module connected into system there are three ways: (1) no backplane, indirect mouth directly connected by module, and then fixed to the corresponding guide rail. OMRON CQM1 machine was this kind of structure, more compact. (2) has a base plate, all modules are fixed on the floor. OMRON C200Ha machine, CV2000 etc, mainframe is this kind of structure. It is strong, but the bottom of the slot number is fixed, such as 3, 5, 8, 10 slot and so on. Slot number equals the number of modules may not actual, configuration unavoidably have time slot. It was waste, and occupy a space more, also have to account for the extra slot for fill the empty cells. (3) using rack instead of base plate, all modules are fixed on the rack. This structure is more complicated than the plate type, but more secure. Some very large PLC used for this structure. 3 according to the manufacturer is manufacturer of PLC. But it can form a complete set of production, large, medium and small, miniature can production is not too much. Influential, a larger share of the company in the Chinese market are: Germany's Siemens, it have SS series of products. Have SS - 95 - u, 100 u, 115 u, 135 u and 155 u. 135 u and 155 u for mainframe, control points can reach more than 6000 points, analog quantity can reach more than 300 road. Also recently launched S7 how, have S7 - 200 ( Small) ,S7 - 300 ( Medium) And S7 - 400 machine ( Large) 。 Greatly improved my performance than S5. Japan OMRON corporation: it has CPM1A type machine, P type machine, H machine, CQM1, CVM, CV type machine, Ha, F machine, such as large, medium and small, micro all has, especially in medium and small and micro more expertise, in China and the world market, a considerable share. American GE company, Japan FANAC venture GE's 90-70 - FANAC machine is also very attractive. It was reported. They have the characteristics of 25. Such as, with a soft hard set set generation, structured programming, and a variety of programming languages, and so on. It is 914, 781/782, 771/772, 731/732 and other models. Additionally, there were 90-30 medium-sized machine series, the models have 344, 331, 323, more than 321; There are 90-20 series minicomputer, models for 211.
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