介绍了E6C2编码器的特点，并结合可编程序控制器的高速计数模块重点阐述了如何利用增量式编码器实现位置的精确定位。
This paper introduces the characteristics of E6C2 rotary encoder, and integrates high-speed counter block of PLC, explains how to use incremental rotary encoder to carry out the precise positioning.
利用PLC高速计数模块直接将外部编码器发出的脉冲读入，在PLC内部编程，通过程序控制完全能取代位置控制器的所有功能，从而省出位置控制器这一环节。
The pulse is directly read out by utilizing PLC high-speed counting module, the function of the locating controller can be achieved by program, thus the locating controller are saved.
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