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介绍可编程序控制器的基本原理及在油淬火回火钢丝生产线上应用的电气控制原理。使用ＰＬＣ可编程序控制器可降低故障率，保证产品质量，一旦出现故障可迅速查明并排除。
The basic principle of programmable logic controller (PLC) and the principle of electrical control applied in oil quenching and tempering wire production line are introduced. The use of PLC programmable logic controller can reduce the failure rate to ensure product quality, in the event of failure can be quickly identified and excluded.