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介绍了在三机架冷连轧机中应用的可编程序控制器的硬件组成及梯形图语言编程的技巧。PLC控制系统与分布式计算机控制系统有机地结合起来，可以发挥两种系统各自的特长。
The hardware composition of programmable logic controller (PLC) used in three-stand tandem cold rolling mill and the skills of ladder language programming are introduced. PLC control system and distributed computer control system organically combine, can play their own strengths of the two systems.