机加工自动线电气控制系统设计

摘  要：本文介绍了机加工自动线电气控制系统的设计方法。简述了机加工自动线的组成和功能，详细论述了该系统的PLC程序设计及特点。PLC能使微机取代逻辑电路中由继电器、定时器和计算机组成的信号处理部分（逻辑操作/控制）。它是被按钮开关和传感器的输入激活的，并且控制输出负载（比如说电动机、指示灯等）。输入给PLC的程序就决定了满足输出负载的控制。虽然，就简单的控制来说，用继电器控制电路看上去似乎更简单一些，但是当系统变得复杂时接线工作就变得非常困难了。而这个恰恰是PLC的优点，不管系统是否复杂，它一样非常容易创建内部电路（仅仅需要通过程序制作控制台将程序编程即可）。

关键词：机加工；自动线；控制系统；程序设计

Design of electric control system in automatic machining line

ABSTRACT ：In this paper, design scheme of  electric control system in automatic machining line is introduced. constitution and function of automatic machining line is described simply. program design about programmable controller (PC) and it`s speciality in this system is introduced particularly. It is a PC that enables a microcomputer to take place of the signal processing part (logical operation / control) in the logical circuit (hard-wired logic), which consists of the relays, timers and counters. The PC is activated by the input from the push button switches and sensors (proximity / limit switches) and control the output loads such as motors and pilot lamps.The control contents for the output loads are determined by the programs given to the PC. Even though it seems easier to use a relay circuit for such a simple control, it becomes very hard to work for wiring when the control becomes complicated. As a merit of PC, it is still easy to create the internal circuit no matter how the control is complicated since it is just a matter of encoding through the programming console.
Keywords: Machining; Automatic line;Control system; Program design