对工业平缝机回缝线迹的产生原理进行分析，提出回缝线迹整齐与否的关键技术是对倒缝继电器的控制。
The principle of tacking stitching of lockstitch sewing machine was analyzed, pointing out that whether the tacking stitching is in good order or not lies in how to control the tacking relay.
介绍了利用可编程控制器对继电器控制式工业洗衣机进行改造的过程，实现了系统的高稳定性和可靠性。
The original relay control system of industrial washing machine is innovated and replaced by programmable controller, good stability and reliability of the system is achieved.
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。
Integrating the conventional relay control, computer control and communication control technologies, programmable logic control (PLC) is designed specially for industrial control.
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