1768-CNB ,1768-CNB ,1768-CNB
溫室大棚溫度PLC控制系統(tǒng)設(shè)計(jì)
本例中,雙金屬條用來(lái)檢測(cè)周?chē)鷾囟取_@可以是一個(gè)控制所有窗戶(hù)的大型商業(yè)綠棚,或是有一個(gè)窗戶(hù)的花園綠棚。本例是控制四扇窗戶(hù),每扇窗戶(hù)有一檢測(cè)溫度的雙金屬條,對(duì)每個(gè)雙金屬條,存在兩個(gè)輸入,一個(gè)對(duì)應(yīng)金屬條冷的情況,這可以認(rèn)為是常閉的,另一個(gè)對(duì)應(yīng)金屬條熱的情況,即它變形時(shí),可認(rèn)為是一個(gè)常開(kāi)接點(diǎn)。這些輸入與窗戶(hù)位置有直接聯(lián)系,如果過(guò)熱,雙金屬條彎曲,觸點(diǎn)接通,于是窗戶(hù)打開(kāi)。當(dāng)綠棚部分變冷時(shí),雙金屬條伸直,窗戶(hù)關(guān)上。
要注意的是只用到一個(gè)PLSY指令,這是因?yàn)樗妮敵鋈缢蟮哪菢樱苯优c四個(gè)電機(jī)中的每個(gè)相連(一個(gè)電機(jī)對(duì)應(yīng)于一個(gè)窗戶(hù))。檢測(cè)窗戶(hù)位置為全開(kāi)或全關(guān),如果其中一個(gè)條件存在,與它對(duì)應(yīng)的控制電機(jī)就關(guān)斷。
PLSY指令被開(kāi)或關(guān)窗戶(hù)的請(qǐng)求所。這部分程序可做改進(jìn):請(qǐng)求檢查窗戶(hù)狀態(tài)一可能檢測(cè)全開(kāi)全關(guān)檢測(cè)器。
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