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SST-DN4-102-2模塊 SST-DN4-102-2模塊SST-DN4-102-2模塊 SST-DN4-102-2模塊
定時控制——繼電器控制邏輯利用時間繼電器進行時間控制。時間繼電器存在定時精度不高，定時范圍窄，且易受環(huán)境濕度和溫度變化的影響，調(diào)整時間困難等問題。PLC使用半導(dǎo)體集成電路做定時器時基脈沖由晶振產(chǎn)生，精度相當(dāng)高，且定時時間不受環(huán)境的影響，定時范圍廣，調(diào)整時間方便。
（6）設(shè)計和施工——使用繼電器控制邏輯完成一項工程，其設(shè)計、施工、調(diào)試必須依次進行，周期長、而且修改困難。而用PLC完成一項控制工程，在系統(tǒng)設(shè)計完成后，現(xiàn)場施工和控制邏輯的設(shè)計可以同時進行，周期短，且調(diào)試和修改都很方便。
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