外文翻譯--可編程邏輯控制器（plc）的現(xiàn)況和發(fā)展趨勢-全文預覽
【正文】 elay. Exclusively for the logic of (order) to control functions of a single small memory . However. intheloop 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 a simple analog control and digital volume control with The bination of a partial substitute for the function of singleloop instrumentation. PLC39。 can connect field bus standard 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 work integration, the realization of chemical information. Ether has bee Layer standard for work monitoring. PAC fullfeatured 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 work using Ether / IP, Device Net three work technology. And the realization of the three work Seamless work connectivity is a model of work architecture industries. The technology of nuclear Heart is the CIP (mon industrial protocol) protocol. PLC works Mod bus application is also very extensive. Aspects of the current Romanian Industrial Ether Rockwell Automation, Schneider pushed the main CIP Ether, Siemens and so the main push Ether Net / IP standard work protocol and workbased Prepared. special hardware technology. We all agree that industrial Ether Network will receive a wide range of applications. Ether can dominate the world but also necessary. On the one hand to verify interare 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 better. RC ponents such as body Plot and antijamming measures it is difficult to reduce the need for these discrete ponents. 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 the results of IT in the bottom of the greater use of XML technology. In the work to actively promote the Ether Net applications, the Ether layer of the w
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