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60年代末以来,可编程控制器(PLC)已经走了很长的路,从世界范围讲,它在技术、工艺和应用诸方面都已成熟,市场也趋成熟。PLC 的发展在追随计算机技术、电子技术和半导体技术方面曾经不遗余力,因此今后在技术工艺方面的变化将趋于渐进。这是世界 PLC 制造商的共同看法。制造厂和用户都认为,今后 PLC 要更注重兼容性和通用两个方面,因为用户的现有设备不会废弃,在进入更高一级应用水平时,它必然要求新老设备、低中高档设备能够兼容,从而减少新的投资和培训费用;也必然要求某种限度的通讯以便于进入管理信息自动化和控制系统集成化。
Since the end of the 1960s, programmable logic controllers (PLCs) have come a long way. From a worldwide perspective, they have matured in terms of technology, technology, and applications, and the market has matured. The development of PLC has spared no effort in following computer technology, electronic technology and semiconductor technology. Therefore, the changes in technology and technology will gradually progress. This is the common view of the world’s PLC manufacturers. Both manufacturers and users believe that in the future, PLCs should pay more attention to compatibility and common use. Because the user’s existing equipment will not be discarded, when entering a higher level of application, it will inevitably require new and old equipment, and low-grade high-end equipment. Equipment can be compatible to reduce new investment and training costs; it also requires some kind of limited communication to facilitate access to management information automation and control system integration.