文档介绍：摘 要
在PLC技术的应用中，电气工程师不再在硬件上花费太多功夫，只考虑将控制按钮或检测传感器连接在PLC输入点，再通过PLC内部处理，在输出点连接接触器或继电器，来控制大功率的启动设备，而小功率的输出设备直接连接即可。
随着自动化技术，计算机技术及网络通信技术的迅猛发展，使PLC的功能日增多，它不仅能实现单机的控制，而且能实现多机的控制，同时随着PLC技术的不断发展，在自动化技术的领域中PLC起到了不可忽略的作用，由于PLC在与继电器的比较中有着许多的功能胜过或者是优于继电器，从而使PLC逐步取代继电器，使得其自动化控制有了更进一步的发展，无论从操作，维修，保养还是从线路的简化等方面都更加的方便，其优点更加的突出！
,机床的主电路不变,从而使机床的控制线路简化了,机床故障率降低了。 首先提出电路改进的总体构思,设计出了PLC的梯形图及接线图,重点分析了部分电路的调试过程。
关键词： T68镗床 控制线路 PLC控制 机床电气改造 PLC程序设计
ABSTRACT
In PLC technology application, electrical engineer are no longer spend too many times on the hardware, they can only considered that the control push-button or the examination sensor connection in the PLC entrance point, and than they will be linked with contactor or the relay in the point outputing to control the high efficiency the starting outfit through the PLC internal treatment. The output of low-power devices can be connected directly to it.
With the rapid development of the automation technology, computer technology and network communication technology, the PLC function increases day by day. It is not only able to control the stand-alone, but also realize much machine controlling. At the same time as the PLC technology development, PLC has played a very important role in the field of automation technology. Due to many functions of PLC are better than relay so that the PLC gradually replace the relay. This enabled the automated control of PLC have the further development, it is more convenient, no matter for the operation, the service, maintains or line's simplification. It's merit even more prominent.
This article based on the merits of the PLC on T68 boring machine to carry out electrical lines transformation.'s Original machine tool operation the same way, the machine's main circuit unchanged, so that the machine control circuit simplifies the machine to reduce the failure rate. Was first proposed to improve the circuit The overall idea of the design of the PLC lad