AVIZA 908162-001
AVIZA 908162-001
廈門興銳達(dá)自動化設(shè)備有限公司 http://www.xrdzidonghua.com
AVIZA 908162-001與控制系統(tǒng)連接的各類信號(信號線和控制指令線)傳輸線,除了傳輸有效的各類信息之外,總會有外部干擾信號侵入。此干擾主要有兩種途徑:一是通過變送器供電電源或共用信號儀表的供電源串入的電網(wǎng)干擾,這往往被忽視;二是信號線受空間電磁輻射感應(yīng)的干擾,即信號線上的外部感應(yīng)干擾,這是很嚴(yán)重的。由信號引入干擾會引起 I/O 信號工作異常和測量精度大大降低,嚴(yán)重 時將引起元器件損傷。對于隔離性能差的系統(tǒng),還將導(dǎo)致信號間互相干擾,引起共地系統(tǒng)總線回流,造成邏輯數(shù)據(jù)變化、誤動和死機(jī)。控制系統(tǒng)因信號引入干擾造成 I/O 模件損壞數(shù)相當(dāng)嚴(yán)重,由此引起系統(tǒng)故障的情況也很多。所以檢測端信號加隔離非常重要(例:北京平和PH系列隔離器產(chǎn)品),既可以保證信號傳輸精度,還可以保護(hù)系統(tǒng)I/O模件不被損壞。
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