施耐德140NOE77101

施耐德140NOE77101

可以PLC對(duì)程序執(zhí)行有限次數(shù)掃描（從1次掃描到65,535次掃描），通過PLC運(yùn)行的掃描次數(shù)，可以監(jiān)控程序過程變量的改變。*次掃描時(shí)，SM0.1數(shù)值為1。

1. 執(zhí)行單次掃描

“單次掃描”使PLC從STOP轉(zhuǎn)變成RUN，執(zhí)行單次掃描，然后再轉(zhuǎn)回STOP，因此與*次相關(guān)的狀態(tài)信息不會(huì)消失。操作步驟如下：

（1）PLC必須位于STOP（停止）模式。如果不在STOP（停止）模式，將PLC轉(zhuǎn)換成停止模式。

（2）用菜單“調(diào)試”→ “*掃描”。

圖1  “執(zhí)行掃描”對(duì)話框

2. 執(zhí)行多次掃描

步驟如下：

（1）PLC須位于STOP（停止）模式。如果在STOP（停止）模式，將PLC轉(zhuǎn)換成停止模式。

（2）用菜單“調(diào)試” →“ 多次掃描” →出現(xiàn)“執(zhí)行掃描”對(duì)話框。如圖3-23所示。

（3）輸入所需的掃描次數(shù)數(shù)值，單擊“確定”。

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