*康AS-B838-032
*康AS-B838-032
可以PLC對程序執(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，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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