Integrating the conventional relay control, computer control and communication control technologies, programmable logic control (PLC) is designed specially for industrial control.

可编程控制器(PLC)将传统的继电器控制技术、计算机控制技术和通信技术融为一体，专为工业控制而设计。

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It is gradually replacing the traditional relay control system.

它正逐步取代传统的继电器控制系统。

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The method of transforming the relay control system with PLC was introduced.

介绍了一种用PLC改造继电器控制系统的方法。

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