IC697VAL328
IC697VAL328PLC有不同的安裝規(guī)范,如CPU與電源的安裝位置、機架間的距離、接口模塊的安裝位置,1/O模塊量、機架與安裝部分的連接電阻等都有明確的要求,安裝時必須按所用的產品的安裝要求進行。PLC應設有獨立、良好的接地裝置,接地電阻要小于100Ω,接地線不能超過20m,PLC不能與其它設備共用一個接地體川。PLC電源線、I/O線、動力線最好放在各自的電纜槽或電纜管中,線中心距要保持至少大于300mm的距離。模擬量輸入/輸出線最好加屏蔽,且屏蔽層應一端接地。PLC要遠離干擾源,信號線若不能避開干擾源,應采用光纖電纜。在室外安裝時須采取防雷擊的措施,比如在兩端接地的金屬管線中走線。
為了減少動力電纜電磁輻射干擾,尤其變頻裝置饋電電纜引起的電磁干擾,決定采用兩條基本原則:其一是在實際工程中,盡量采用銅帶鎧裝屏蔽電力電纜,降低動力線產生的電磁干擾,這種方法的實際效果在許多場合被證明是非常有效的;二是對不同類型的信號分別由不同電纜傳輸,信號電纜應按傳輸信號種類分層敷設,嚴禁同一電纜的不同導線同時傳送動力電源和信號,避免信號線與動力電纜平行敷設,以減小電磁干擾。 在PLC控制系統(tǒng)中,硬件上的抗干擾設計是基礎也是抑制干擾的根本的措施。除此之外,還可以在軟件設計上,可以采用數(shù)字濾波和軟件容錯等經濟有效的方法,進一步提高系統(tǒng)的可靠性。
廈門卡庫電氣有限公司
地 址: 廈門湖里區(qū)枋湖西一里22號1302室
聯(lián)系人:嚴小姐
T:0592-5709823
P:18030229052
F:0592-5709828
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