Programmable controller (PLC) is a control device, developed from the traditional relay circuit, facing the general industrial control field. Its development is based on the field device control needs of the manufacturing industry, emphasizing on-off logic control, and is suitable for small automatic control sites.
1. PLC's overall market size
In 2006, the scale of China's PLC market was 4.43 billion yuan. By 2010, the scale of China's PLC market reached 6.84 billion yuan, a year-on-year increase of 36.8% compared to the market scale of 5 billion yuan in 2009. The compound growth rate of PLC market size from 2006 to 2010 was 9.08%. With the promotion of equipment automation during the "12th Five-Year Plan" period, the industry expects the PLC market to continue to grow. By 2013, the market size is expected to reach 9 billion yuan. 2006-2013 China PLC market scale and forecast are shown in Table 1:
Table 1 China PLC market size from 2006 to 2013
Figure 1 2006-2013 China PLC market size and change trend
At present, PLC products in the world can be divided into three genres according to region: one genre is American products, one genre is European products, and one genre is Japanese products. PLC technology in the United States and Europe is independently researched and developed under the condition of mutual isolation, so PLC products in the United States and Europe have obvious differences. The PLC technology in Japan was introduced by the United States, which has a certain inheritance to the PLC products in the United States, but Japan's main products are positioned on small PLCs, which are famous for small PLCs. The United States and Europe are famous for large and medium-sized PLCs.
â‘ American PLC products. The United States is a major PLC production country with more than 100 PLC manufacturers. Famous companies include AB, GE, Modicon (now a subsidiary of Schneider Electric in France), Texas Instruments (Texas Instruments, TI) ) Company etc. Among them, AB is the largest PLC manufacturer in the United States, and its products account for about half of the American PLC market.
AB has complete product specifications and a wide variety of products. Its main large and medium-sized PLC products are PLC-5 series. This series is a modular structure; AB's small PLC products include SLC500 series. The representative products of GE company are: small machines are GE-1, GE-1-J, GE-1 / P, etc., except for GE-1 / J, all adopt modular structure; the representative product of medium-sized machine is GE-III, which Compared with GE-1 / P, it adds interruption and fault diagnosis functions; mainframe GE-V adds some data processing, table processing, subprogram control and other functions than GE-III, and has strong communication functions. Texas Instruments' new small PLC products include 510, 520, and TI100, medium-sized PLC new products include TI300 and 5TI, and large-scale PLC products include PM550, 530, 560, and 565 series. Except that TIl00 and T1300 have no networking function, other PLCs can communicate and form a distributed control system. Modicon's representative product is the M84 series PLC. Among them, M84 is a small computer with analog control and communication with the host computer; M484 is a medium-sized computer, which has a strong computing function, can communicate with the host computer, and can also be connected to multiple computers; M584 is a mainframe with large capacity, Strong data processing and network capabilities; M884 is an enhanced medium-sized machine, which has the structure of a minicomputer and the control function of a mainframe.
â‘¡Europe PLC products. Germany's Siemens (SIEMENS), AEG and France's TE are famous European PLC manufacturers. The electronic products of Siemens of Germany are well-known for their excellent performance. In the field of medium and large-scale PLC products, it is the same as the American AB company.
The main products of Siemens PLC are S5 and S7 series. In the S5 series, S5-90U and S5-95U belong to micro-integrated PLC; S5-1OOU is a small modular PLC; S5-115U is a medium-sized PLC; S5-155U is a mainframe. The S7 series is a new product launched by Siemens on the basis of the S5 series PLC in recent years. Its performance and price ratio are high. Among them, the S7-200 series belongs to micro PLC; the S7-300 series belongs to small and medium-sized PLC; Large PLC.
â‘¢ Japanese PLC products. Japan's small PLCs have the most characteristics and are quite well-known in the field of small computers. Some small and medium-sized computers in Europe and the United States can be controlled by some small and medium-sized computers in Europe and America. It is obviously superior to European and American minicomputers in developing more complicated control systems, so it is particularly popular with users. There are many PLC manufacturers in Japan, such as Mitsubishi, Omron, Panasonic, Fuji, Hitachi, Toshiba, etc. In the world's small PLC market, Japanese products account for about 70% of the share.
Mitsubishi's earlier PLC products were the F series of minicomputers and its upgraded products F1 / F2 series. Following the F1 / F2 series, Mitsubishi has launched the FX series and FX2 series, which have been comprehensively strengthened in terms of capacity, speed, special functions, network functions and so on. FX2N is a high-function integrated minicomputer launched in recent years. It is a replacement product of FX2, and various functions have been comprehensively improved. In recent years, it has also continuously introduced micro PLCs that meet different requirements, such as FXOS, FXlS, FXON, FXlN, and a series products.
Omron's PLC products are complete in large, medium, small and micro specifications. The microcomputer is represented by the SP series, which is actively small and extremely fast; the minicomputers are P-type, H-type, CPM1A series, CPM2A series, etc .; the medium-sized machines are C200H, C200HS, C200HX, C200HG series; C2000H, CV (CV500 / CVl000 / CV2000 / CVMl), etc.
Among Panasonic's PLC products, FPO is a microcomputer, FP1 is an integrated minicomputer, FP3 is a medium-sized computer, FP5 / FP1O, FP10S (improved FP10), and FP20 are large-scale computers. The main features of Panasonic PLC products in recent years are: strong command system functions; some models also provide CPUs and various intelligent modules that can be programmed in FP-BASIC language, providing software means for the development of complex systems; FP series All kinds of PLCs are equipped with a communication mechanism. Due to the consistency of the application layer communication protocols they use, this brings convenience to the formation of multi-level PLC networks and the development of PLC network applications.
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