掃描時間計算示例以系列90-30 331型PLC為例，確定掃描時間的計算,輸人模塊:5個16點30型輸入模塊。輸出模塊:4個16點30型輸出模塊。編程指令:1個1200行的程序由700個邏輯(布爾)指令(LD,AND,OR等),300個輸出線圈(OUT,OUTM等)和200個數(shù)學(xué)功能(ADD,SUB等)組成。

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