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廈門市泰尼電器有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
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廈門市泰尼電器有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
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更新時(shí)間:2018-04-05 16:44:21瀏覽次數(shù):324
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【IC697ALG441】【IC697ALG441】
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為了說(shuō)明從一個(gè)狀態(tài)到另一個(gè)狀態(tài)的變化,要用轉(zhuǎn)移概念,即用一個(gè)有向線段來(lái)表示轉(zhuǎn)移的方向,連接前后兩個(gè)狀態(tài)。如果轉(zhuǎn)移是從上向下的(或順向的),則有向線段上的方向箭頭可省略。兩個(gè)狀態(tài)之間的有向線段上再用一段橫線表示這一轉(zhuǎn)移。轉(zhuǎn)移的符號(hào)如圖2(c)所示。
轉(zhuǎn)移是一種條件,當(dāng)此條件成立,稱為轉(zhuǎn)移使能。該轉(zhuǎn)移如果能夠使?fàn)顟B(tài)發(fā)生轉(zhuǎn)移,則稱為觸發(fā)。一個(gè)轉(zhuǎn)移能夠觸發(fā)必須滿足:狀態(tài)為動(dòng)狀態(tài)及轉(zhuǎn)移使能。轉(zhuǎn)移條件是指使系統(tǒng)從一個(gè)狀態(tài)向另一個(gè)狀態(tài)轉(zhuǎn)移的必要條件,通常用文字、邏輯方程及符號(hào)來(lái)表示。
:張亮(工程師) 專線:
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