1、 中文 2300 字 The status and development trend of Programmable Logic Controller(PLC) Rockwell Automation Control Logic Product Manager, China Region PLC is to improve the productivity of the development of the requirements-driven. Upgrading difficult to maintain the inconvenience. With the development
2、of electronic components, Before and after the 1969 invention of the PLC (Programmable Logic Controller). AB (Allen I. Bradley) is the inventor of the PLC And PLC, one of the family as the use of registered trademarks. AB (Rockwell) since Action of the acquisition), The first is to replace a major r
3、ole in PLC Relay. Exclusively for the logic of (order) to control functions of a single small memory . However. in-the-loop regulation. Still need to loop a single instrument or DCS. With electronic technology, control technology, PLC from the simple The development of the digital volume control to
4、a simple analog control and digital volume control with The combination of a partial substitute for the function of single-loop instrumentation. PLCs first major application in the automotive production line. With the application of Continuously expand the area of a variety of households in PLC. In
5、order to meet the needs of different Application of the requirements of the needs of families with a strong PLC itself flexibility. Households PLC Factory solution is standardized, modular and network. Input, output signal into 20mA and so on, each signal using. A types of processing modules, each m
6、odule there are multiple channels, so that the composition can not With the size of the system. At the same time, also can reduce the R & D and production costs. Standard Results of a standardized programming languages. IEC61131-3 In the data structure, program structure, programming language and da
7、ta exchange, etc. Established international standards, a new type of PLC, including reference to the DCS are marked Development potential. PLC family of network capacity from scratch. Today has been very Powerful. Through the network. Decentralized control can be achieved, reducing installation cost
8、s. To improve integration. It is precisely because this flexibility. Users can easily Build their own automated control system. Households PLC is designed for Industrial environment, therefore, reliability and strong anti-interference ability. Households P LC In the long-term applications, challenge
9、s. Almost become a high reliability of the generation of Word. Almost all large-scale sequence control, it is important to the application of PLC-body Achievable. It can be said. No household there is no modern manufacturing PLC. DCS further integration of PLC technology, the development of AC-morte
10、m (Programmable Automation Controller). PAC in the current Domestic and foreign have different definitions. PAC mentioned here is not a PC - The realization of automatic control. It is not only the order of control functions can be achieved, but also The realization of process control, motion contro
11、l, drive control, safety control and approved Department The rationale for such. PAC has a strong ability to connect to the network a variety of standard Prospective on-site bus. Connected to the standards, including FF and PA networks, the Types of device-level networks； can connect field bus stand
12、ard frequency Browser, MCC (Motor Control Center). The expansion of I/O also can be connected not with the controller. AC households can Convenient and enterprise network integration, the realization of chemical information. Ethernet has become Layer standard for network monitoring. PAC full-feature
13、d short, in the factory since -Action, only the user AC mining can be achieved so the control functions. Not the need for other control systems. Rockwell Automation in the network using Ethernet / IP, Device Net three network technology. And the realization of the three network Seamless network conn
14、ectivity is a model of network architecture industries. The technology of nuclear Heart is the CIP (common industrial protocol) protocol. PLC networks Mod bus application is also very extensive. Aspects of the current Romanian Industrial Ethernet Rockwell Automation, Schneider pushed the main CIP Et
15、hernet, Siemens and so the main push Ether Net / IP standard network protocol and network-based Prepared. special hardware technology. We all agree that industrial Ethernet Network will receive a wide range of applications. Ethernet can dominate the world but also necessary. On the one hand to verif
16、y inter-are still some technical problems yet to be solution Decision. On the other hand, the installation of the existing mature owned bus is very great. Extremely costly full replacement. With the development of electronic technology. PLC size is getting smaller and smaller. Small Is limited. Not
17、better. RC components such as body Plot and anti-jamming measures it is difficult to reduce the need for these discrete components. At the same time. In order to use more convenient, more powerful, constantly expanding the memory controller Large capacity continued to increase. PLC has also absorbed
18、 the results of IT in the bottom of the greater use of XML technology. In the network to actively promote the Ethernet Net applications, the Ethernet layer of the network from the information into real-time control network is the head The direction of the previous efforts. In fact, Rockwell Automati
19、on can be used Ethernet control. GE in the new system to control the use of Ethernet I/O 100ns to complete Ether Net/IP the clock synchronization. Can be used SOE records, including applications, including high-precision. IP has been A wireless network adapter can be distributed through the wireless Ethernet control System which is difficult to install wiring environment very attractive. Currently on the market Also did not release the servo control Ethernet products but many manufacturers are developing. Some manufacturers have prototype.
