软冗余技术在丙酮废液处理系统中的应用

Application of the Soft Redundancy Technology in Acetone Waste Liquid Treatment

为了提高控制系统的自动化程度、降低故障率,通过分析系统工艺及控制功能,提出了基于Profibus和MPI总线的丙酮废液处理系统控制方案。该系统以Profibus-DP总线为通信载体,采用CPU 314C-2DP模块、IM153-2接口模块和防爆I/O模块及软件冗余技术,实现了工业现场控制级的冗余,解决了易燃易爆场所工艺参数的测量以及执行部件的控制问题,并通过CP342-5通信模块有效地解决了主备系统间数据的同步问题。现场调试结果表明,系统操作简便灵活、性能稳定可靠、故障率低。

In order to enhance the automation level and reduce the failure rate of the control systems,through analyzing the systematic process and control functions,the control strategy for acetone waste liquid treatment system based on Profibus and MPI bus is proposed.In the system,with Profibus-DP as the communication carrier,the redundancy on industrial field control level is implemented by adopting CPU 314C-2DP PLC,IM153-2 interface module and explosion proof module as well as the software redundancy technology.The measurement of technological parameters and the control of actuators under inflammable and explosive environment are resolved;and the data synchronization between main system and backup system is realized effectively via CP342-5 communication module.The results of test on site indicate that the system features ease operation,stable and reliable performance and low failure rate.