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近年来微机可编程序控制器(PC)有了惊人的发展,在主要西方国家每年以超过30%的速度增长。由于PC具有小型微型计算机不具备的一些特性;又由于PC在联合机械、液压、气动、光控及仪表自动化实现“机电仪一体化”新体系中的进展;以及PC在处理模拟量数据输入输出的能力、连接人工智能终端、生成复杂生产报表、开发高级监控显示和愈来愈多用于过程控制等方面的进展;使得PC成为八十年代控制领域基础自动化的极其重要的元器件。从本质上可以把PC看成为一种计算机,它的硬件结构和工作机理与一般微型计算机相似,而它的编程方法独特,专为工业控制设计,对使用环境条件要求不高,有多种可以直接接收处理现场信息及直接控制现场设备的I/O接口,则与一般计算机有较大区别。PC应用软件的编程方法,不用高级语言而用“梯形图”,该方法简明通俗,易学易编易改;编程软件化(可编程序、数据处理可接口性)与各类硬接线系统相比,大大方便了使用和设计,缩短了设计、基建、培训周期。PC能与上位计算机通讯,在工厂全盘综合自动化的分级控制中起着不可缺少的基础作用。
In recent years, computer programmable logic controllers (PCs) have enjoyed phenomenal growth, growing at over 30% per year in major Western countries. The PC has some of the features not found in small form factor microcomputers and advances in the new “mechatronics” new system due to the PC’s combined mechanical, hydraulic, pneumatic, light control, and meter automation; and the PC’s ability to process analog data input and output The ability to connect AI terminals, generate complex production reports, develop advanced monitoring displays and more and more for process control and other aspects; making the PC an extremely important component of the fundamental automation in the control of the eighties. PC can essentially be regarded as a computer, its hardware structure and working mechanism similar to the general micro-computer, and its unique programming methods, designed for industrial control, the requirements of the use of environmental conditions is not high, there are a variety of Directly received and processed on-site information and direct control of field devices I / O interface, and the general computer are quite different. PC application programming method, without the use of high-level language and “ladder”, the method is simple and easy, easy to learn and easy to change; programming software (programmable, data processing interface) with a variety of hard-wired system , Greatly facilitate the use and design, shortening the design, infrastructure, training cycle. PC can communicate with host computer, which plays an indispensable foundation role in the overall automation of the factory.