6ES5490-7LA11输出模块现货供应欢迎询价

6ES5490-7LA11输出模块现货供应欢迎询价
6ES5490-7LA11输出模块现货供应欢迎询价



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。
至于程序互换的问题，至少到目前为止尚是一个努力的方向。只有在每个PLC的供应厂商所提供的PLC产品都真正遵循IEC 61131-3的标准，而且其编程系统的具体实现又切实符合IEC 61131-8
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