采用位域的PLC上位机数据压缩方法及实现

Data Compression Method and Realization of PLC Host Computer Using Bit-field

针对当前工业控制系统中系统数据与PLC数据不匹配问题,提出一种采用位域的PLC上位机数据压缩方法。该方法接收系统其他数据,分析系统数据与PLC数据的差异性,定义相应的限制位域的结构体,借助于位域完成系统数据到PLC数据的压缩工作,最后将压缩后的用户数据组包发送给PLC设备。将所提方法应用于PLC上位机软件中,并成功在某飞机舱门训练器中得到实践。结果表明,该方法具有良好的实用价值,比传统数据压缩方法更加简单、高效和易操作。

In order to solve the problem of data mismatch between host computer and PLC in current industrial control systems,a method of data compression for host computer using Bit-field is proposed,this paper receives other system data,analyzes the difference between the system data and PLC data,defines the structure of the corresponding restricted Bit-field,and completes the compression of the system data to PLC data with the help of the Bit-field.The compressed user data packet is sent to the PLC equipment.This method has been applied to the software of PLC host computer and has been successfully applied to a cabin door trainer.The results show that the method has good practical value,and is more simple,more efficient and easier to operate than the traditional data compression methods.