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| 摘要: |
| 研究了西门子可编程控制器(PLC)软冗余系统的软硬件组成及实现原理,典型的PLC软冗余系统由主/备的CPU、电源、I/O模块和总线等组成.一旦发生故障,备CPU接替主CPU工作,保证系统正常运行.分析了PLC软冗余系统在主CPU、电源、I/O模块和Profibus总线等分别发生故障情况下,不同故障发生时刻引发的软件中断和主备切换过程,得出了相应的主/备切换时间极限值的估算公式.分析了PLC软冗余系统的数据同步过程,得出了数据同步时间的估算公式.通过分析可知,PLC软冗余系统的主备切换时间和数据同步时间较长,适合于对实时性要求不严格的生产过程控制. |
| 关键词: 软冗余 主备切换 数据同步 可编程控制器 网络故障 |
| DOI： |
| 分类号:TP273.5 |
| 基金项目:西安市工业科技攻关项目? |
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| Performance analysis of PLC software redundancy system |
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MA Boyuan L(U) Jingrnei ZHANG Zhitong
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| Abstract: |
| The structure of SIMATIC PLC software redundancy system and its implementation principle are studied.Typical PLC software redundancy system consists of master-backup CPU,power supply,I/ O module and field-bus.When breakdown occurs,the backup CPU runs instead of former master CPU to assure the normal operation.The changeover procedure is analyzed for different component break- downs at different moments to get the estimation formula of corresponding maximum changeover time, and the data synchronization proce... |
| Key words: software redundancy master-backup changeover data synchronization PLC fault of network |
