第一個例子試圖建立–個能計算開關%10001閉合次數(shù)的計算回路，但不成功。運行結果存儲在寄存器%R0002中。這個設計的目的是當%10001閉合時，ADD指令將%R0002中的數(shù)值加1，并將新的數(shù)值返回到%R0002。這個設計的問題是%10001閉合時，ADD指令執(zhí)行一次時間為一個PLC掃描時間。所以，例如，%10001保持閉合狀態(tài)5次掃描時間，輸出就將增加5次，即使%10001在那個時期只閉合了–次。

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