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TRILLIUM 865-5058-03以上幾種情況現(xiàn)場(chǎng)沒(méi)有解決好可以選適合自己使用的隔離器產(chǎn)品解決共地干擾問(wèn)題。
4.2 DCS 系統(tǒng)的接地：計(jì)算機(jī)控制系統(tǒng)中的“地”有兩類。其一是設(shè)備的外殼及屏蔽層，通常與大地相連。接地的目的一是避免機(jī)殼帶電而影響人員及設(shè)備的安全，二是保持機(jī)殼及屏蔽層與大地等電位，起到屏蔽外部電磁場(chǎng)干擾的作用。另一類是電源或信號(hào)的參考地位。在微機(jī)控制系統(tǒng)中，即有模擬量信號(hào)，又有數(shù)字量信號(hào)，還有電源（直流）電壓的地端。這些信號(hào)的地終就是直流電源的地。為防止公共阻抗產(chǎn)生的干擾，采用“匯流條分別走線”進(jìn)行處理，即在電路中把模擬地與數(shù)字地分開(kāi)，采用匯流條分別走線，終在一點(diǎn)把兩個(gè)地接在一起。信號(hào)的屏蔽層采用單點(diǎn)接地原則，可以防止不同接地點(diǎn)之間的電位差（Ucm）通過(guò)屏蔽層形成電流回路，產(chǎn)生干擾。
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HITACHI HIGH TECH E-214998 SHAFT
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OMRON G32A-A10-VD Relay, Power Device Cartridge for Relay, LOAD: 24-240VAC~, 10
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OKAZAKI KPW45336 AEROPAK THERMOCOUPLE, ELEMENT: K, CLASS: 2, SHEATH MAT'L: SUS3
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