国内绝大多数化纤企业仍然采用人工取样滴定酸浴检测方法，而这种方法由于受人为因素的影响很大，导致测量重复性差、测量结果滞后、实时性差，因而调配的酸浴品质不高，浓度波动较大，对粘胶纤维的生产品质影响很大。针对以上问题，采用S7—200PLC和VISUAL Basic及SQL Server数据库，开发了多通道实时监控系统，该系统配置灵活，扩充方便，可靠性高，能以支现形象的方式表现实时数据，同时对历史数据采用SQL Server数据库进行了保存，可方便地进行查询和分析。实际应用表明具有良好的运行效果。

Most chemical plant in China still use the manual work to sample and titrate in acid dip. However, this method, owing to its heavy factitious influence, has bad checking repetitiveness, real time, and unreliable which seriously influences the quality of acid dip. This affects the quality of product. For solving this problem, the paper proposes multi channel real time monitor system, using S7 200 PLC, Visual Basic and SQL Server 2000. The system has high flexibility and reliability, is convenient to extend and can display data visually and vividly. Furthermore, the system can use SQL Server to save historical data, which makes it easy to inquire and analyze data. Practical application of this system shows that it has good effect.

TQ341.1 TQ340.6