描述
从以上可以看出,纯硬件冗余的方式硬件投入较多,成本开支较大大。而软件冗余,只需增加一块CPU模块,成本增加很少,因为一般像CPU这种PLC的心脏,厂家都会配有备件,用备件来实现冗余控制,既提高了系统的可靠性和可维护性(可做到在线维护,不影响生产线运行),又不会显著增加成本开支。
单纯从可靠性方面分析,纯硬件的冗余较之软件冗余并无优势。因为增加了较多的部件、模块,这些部件和模块的故障,也会影响系统的可靠性。例如,当两个热备模块之间的连接光缆出现故障,同样会使冗余控制失效。而软件冗余,只增加了一块CPU模块,而两个CPU模块的同时故障率几乎为零。
纯硬件冗余的优点之一,就是不需要软件进行专门的编程,CPU的状态监视和控制权的转移是由两个热备模块来完成的。而软件冗余中两个CPU模块的状态监视和控制权的转移是通过软件编程解决的。因此,软件冗余编程相对比较复杂,工作量较大。
综合考虑以上因素,本熔盐炉自动系统采用软件方式实现PLC的双CPU冗余控制。两块CPU模块同时在系统中运行,一块运行于主控模式,另一块运行于热备份模式。当其中任一块CPU发生故障时另一块CPU立即监视到并发出报警,自动将正常的CPU投入主控模式。CPU
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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