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本文分析了Ｊ２１０８型胶印机原电气控制系统的弊端，叙述了主令元件与负载间的控制逻辑．介绍了用可编程序控制器对其进行技术改造的方法，提出了改造方案，进行了系统逻辑设计与梯形图等设计，从而实现了用ＰＬＣ对Ｊ２１０８型胶印机的自动控制．
This article analyzes the disadvantages of the original electric control system of J2108 offset printing machine and describes the control logic between the main command element and the load. Introduced the programmable controller to its technological transformation methods, put forward the transformation scheme, the system logic design and ladder design, so as to achieve the PLC on J2108 automatic control of offset printing machine.