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一、前言可编程序控制器(简称PC)是近十几年来发展起来的一种新型电子数字式控制装置。主要应用于机械自动化领域。自1969年世界上第一台PC问世以来无论从技术上或从应用领域上都有了飞跃的发展。特别是随着微电子技术的发展和工业自动化水平的不断提高,在小型多功能,编程方式的多样化,局部网络化等方面的发展尤其令人注目。可以说PC是一种新型的工业控制用计算机。它与微机相比主要有如下几个特点:
I. INTRODUCTION Programmable controller (PC) is a new type of electronic digital control device developed in recent ten years. Mainly used in the field of mechanical automation. Since the first PC in the world came into existence in 1969, both the technology and the application field have leapfrogged. Especially with the development of microelectronics technology and the continuous improvement of the level of industrial automation, the development of small multi-functional, programming-based diversification and local network are especially noticeable. It can be said that PC is a new type of industrial control computer. Compared with the computer it has the following main features: