Over the years,the programmable logic controller(hereinafter referred to as PLC)has achieved a leap from wiring logic to storage logic from its birth to the present;its functions have changed from weak to strong,and realized the progress from logic control to digital control;its application fields have changed from small to It is large and realizes the leap from simple control of single equipment to competent motion control,process control and distributed control and other tasks.Today’s PLC has greatly improved its ability to handle analog quantities,digital operations,human-machine interfaces and networks,and has become the mainstream control equipment in the field of industrial control,playing an increasingly important role in all walks of life.
多年来，可编程控制器（以下简称PLC）从其产生到现在，实现了接线逻辑到存储逻辑的飞跃；其功能从弱到强，实现了逻辑控制到数字控制的进步；其应用领域从小到大，实现了单体设备简单控制到胜任运动控制、过程控制及集散控制等各种任务的跨越。今天的PLC在处理模拟量、数字运算、人机接口和网络的各方面能力都已大幅提高，成为工业控制领域的主流控制设备，在各行各业发挥着越来越大的作用
Fingerprint Handbook by Richard Williams and Robert Sor
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