1747-L531
1747-L531
1747-L531
由此可见,该软件模型足以映像各类实际系统:对于只有一个处理器的小型系统,其模型只有一个配置、一个资源和一个程序,与现在大多数PLC的情况完全相符。对于有多个CPU模块插装在同一机架上的中、大型系统,每个CPU模块被视作一个配置,可由一个或多个资源来描述,而一个资源则包括一个或多个程序。对于分散型系统,包含多个配置,而一个配置又包含多个处理器,每个处理器用一个资源描述,每个资源则包括一个或多个程序。
值得指出的是,近些年来在日本开始流行的多CPU的PLC结构,恰恰是在IEC 61131-3标准颁布后多年之后才问世的。这个PLC结构的革命性变化,显然是建立在这个软件模型的 理论基础上,要不然PLC还是由一个CPU按扫描方式执行一个程序的那种传统结构。
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