The absolute coder is introduced in two sides of the PLC programming and the interchange between Gray Code and Binary Code to explain how the function of angle measure is finished by PLC.

• 从格雷码与二进制码的互换和PLC编程两方面说明绝对值编码器怎样通过PLC实现角度测量的功能,指出了其在应用于港口装卸机械时应注意的事项。