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通过VBA编程的方法,分析GE iFix数据库的结构和存储方式,结合后台调度,成功的开发了快速的日报表;并引入VBA数组概念,以数组名作起始地址,扩展下标进而扩展了GE iFix的I/O(输入/输出)点数;通过截取字符串,巧妙地解决了GE iFix数据库标签名不能很好的支持中文的问题。针对稳定的浓黑液浓度控制,分析了黑液浓度的主要影响因素——效压力和蒸气流量,采用了串级以及前馈控制,在实践中综合使用了GE iFix和SIMATIC PLC,获得了比较好的效果。
By means of VBA programming, the structure and storage of GE iFix database are analyzed. With the background scheduling, a fast daily report is successfully developed. The concept of VBA array is introduced, the starting address is array name, and the subscripts are expanded to expand GE iFix I / O (input / output) points; by intercepting the string, cleverly solved the GE iFix database tag name does not support the Chinese problem. Aiming at the stability of black liquor concentration control, the main influencing factors of black liquor concentration, such as effective pressure and steam flow rate, cascade and feedforward control were analyzed. GE iFix and SIMATIC PLC were used in practice, Good results.