MPC240

MPC240 PLC才能支持GRAPH，许多小型PLC有他的缩减版：步进指令，但步进指令功能有限，且很不直观。GRAPH就是为方便实现流程设计而产生。步、转换和动作是顺序功能图的三种主要元件，加上灵活的使用其分支、并行和跳转可实现复杂的流程，程序可以做到非常直观，也很容易增改，执行效率高，用久了GRAPH后对其他写法都不习惯，缺点就时PLC性能要求高，也占用很大的工作存储器。

MPC240 

MPC240

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