描述
DCS接地分類在一般情況下，DCS控制系統(tǒng)需要兩種接地：保護地和工作地（邏輯地、屏蔽地等）。對于裝有安全柵防爆措施的系統(tǒng)如化工行業(yè)所用的系統(tǒng)，還要求有本安地。2.1保護地（CG，Cabinet?Grounding）
是為了防止設備外殼的靜電荷積累、避免造成人身傷害而采取的保護措施。DCS系統(tǒng)所有的操作員機柜、現場控制站機柜、打印機、端子柜等均應接保護地。保護地應接至廠區(qū)電氣專業(yè)接地網，接地電阻小于4Ω。2.2邏輯地
也叫機器邏輯地、主機電源地，是計算機內部的邏輯電平負端公共地，也是+5V等的電源輸出地。如CPU的正負5伏、正負12伏的負端。需要接入公共接地極。2.3屏蔽地（AG，Analog?Grounding）
也叫模擬地，它可以把現場信號傳輸時所受到的干擾屏蔽掉，以提高信號精度。DCS系統(tǒng)中信號電纜的屏蔽層應做屏蔽接地。線纜屏蔽層必須一端接地，防止形成閉合回路干擾。鎧裝電纜的金屬鎧不應作為屏蔽保護接地，必須是銅絲網或鍍鋁屏蔽層接地。接入公共接地極。2.4本安應獨立設置接地系統(tǒng)，接地電阻≤4Ω。本安地的接地系統(tǒng)應保持獨立，與廠區(qū)電氣地網或其它儀表系統(tǒng)接地網的距離應在5m以上。由于第三種接地方式與第二種接地方式有較多相同處，過去，計算機或DCS系統(tǒng)曾經較多的采用過專用的接地網。但這種接地方式存在的缺點是：占地面積太大，投資高，電纜及接地網鋼材耗量大，距廠房有相當的距離(因不易在廠房內找到合適的位置)，管理、維護、測量及查找接地極和接地線不方便，且效果不甚良好。根據實際運行表明，設置專用的DCS接地網是既困難又不安全的。
產品承諾：
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主營DCS系統(tǒng)配件
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