第一個(gè)例子試圖建立–個(gè)能計(jì)算開(kāi)關(guān)%10001閉合次數(shù)的計(jì)算回路，但不成功。運(yùn)行結(jié)果存儲(chǔ)在寄存器%R0002中。這個(gè)設(shè)計(jì)的目的是當(dāng)%10001閉合時(shí)，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(gè)設(shè)計(jì)的問(wèn)題是%10001閉合時(shí)，ADD指令執(zhí)行一次時(shí)間為一個(gè)PLC掃描時(shí)間。所以，例如，%10001保持閉合狀態(tài)5次掃描時(shí)間，輸出就將增加5次，即使%10001在那個(gè)時(shí)期只閉合了–次。

Dynisco Signal Conditioner RT350-V1, 115 VAC #32993

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