锻压技术

浮点型数据的WinCC高速采集方法

英文标题：High speed acquiring method of float data based on WinCC

作者：许洪韬谭建平杨俊曾乐

单位：中南大学

分类号：TH-39

出版年,卷(期):页码：2015,40(3):122-126

摘要：

上位机WinCC+下位机可编程控制器（PLC）是工业现场监控系统的主要形式，针对该系统中存在WinCC刷新频率不能满足较高数据采集的问题，根据上位机WinCC与下位机PLC的特点，提出一种新的WinCC高速数据采集方法。该方法通过下位机PLC采集工业现场数据并依次存放于数据块中，数据无需圆整，为浮点型；在上位机WinCC中建立多个外部变量与数据块的过程变量对应，应用C语言编写全局脚本，一次读取数据块中的全部数据；WinCC由原来的一次读取一个数据变为现在的每次读取多个数据，从而间接实现WinCC高速数据采集。对该方法进行了试验测试，结果表明，该高速数据通讯方法能够有效解决WinCC保存数据速率慢的问题，不但保证了读取数据的精确性，而且适用范围更广，为上下位机提供了一种可靠、便捷、低成本的高速数据通讯方案。

The monitoring system in industrial field is mainly comprised of WinCC system and programmable Logical Controller(PLC). For the problem that the refresh frequency of WinCC can not satisfy high speed data acquisition in this system, a new method of high speed data acquisition method based on WinCC was presented based on the features of WinCC and PLC. Firstly, all data was acquired by PLC and stored in DB in proper sequence, and the data was floated without rounding. Then multi external variables corresponding to process variables in DB were established in WinCC system, and global script written by C language acquired all the data in the DB. Winll was changed from collecting a data once a time to collecting multiple data in once, so the high speed data acquisition was achieved indirectly. The experiments were implemented, and the results show that this method can solve the problem of the low speed data acquisition of WinCC. The method not only guarantees the precision of data acquisition, but also can be applied comprehensively. The high speed data communication through a reliable, convenient and low-cost way is suitable for both the upper and lower controlling systems.

基金项目：

国家重点基础研究发展计划（“973”计划）项目(2014CB049405);高性能复杂制造国家重点实验室自主探索基金（zzyjkt2013）

许洪韬（1989-），男，硕士研究生通讯作者：谭建平（1963-），男，博士，教授，博士生导师

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