1756-ENEB
（3） PLC控制系統的抗干擾設計。隨著工業自動化技術的日新月異的發展，晶閘管可控整流和變頻調速裝置使用日益廣泛，這帶來了交流電網的污染，也給控制系統帶來了許多干擾問題，防干擾是PLC控制系統設計時必須考慮的問題。一般采用以下幾種方式:
隔離:由于電網中的高頻干擾主要是原副邊繞組之間的分布電容耦合而成，所以建議采用1:1超隔離變壓器，并將中性點經電容接地。
屏蔽:一般采用金屬外殼屏蔽，將PLC系統內置于金屬柜之內。金屬柜外殼可靠接地，能起到良好的靜電、磁場屏蔽作用，防止空間輻射干擾。
布線:強電動力線路、弱電信號線分開走線，并且要有一定的間隔;模擬信號傳輸線采用雙絞線屏蔽電纜。
備貨，備貨，降降降，火火火，火火火……
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