MPC240 PLC才能支持GRAPH，許多小型PLC有他的縮減版：步進指令，但步進指令功能有限，且很不直觀。GRAPH就是為方便實現流程設計而產生。步、轉換和動作是順序功能圖的三種主要元件，加上靈活的使用其分支、并行和跳轉可實現復雜的流程，程序可以做到非常直觀，也很容易增改，執行效率高，用久了GRAPH后對其他寫法都不習慣，缺點就時PLC性能要求高，也占用很大的工作存儲器。

MPC240 

MPC240

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