GE DS200PCCAG6ACB

安全柵的接地：我們回過(guò)頭來(lái)再看圖3．4.13所示的安全柵線路圖。從圖中可以看出有三個(gè)接地點(diǎn)：B，E，D，通常B和E兩點(diǎn)都在計(jì)算機(jī)這一側(cè)?？梢赃B在一起，形成一點(diǎn)接地。而D點(diǎn)是變送器外殼在現(xiàn)場(chǎng)的接地，若現(xiàn)場(chǎng)和控制室兩接地點(diǎn)間有電位差存在，那么， D點(diǎn)和E點(diǎn)的電位就不同了。假設(shè)我們以E作為參考點(diǎn)，假定是D點(diǎn)出現(xiàn)10V的電勢(shì)，此時(shí)，A點(diǎn)和E點(diǎn)的電位仍為24V，那么A和D間就可能有34V的電位差了，己超過(guò)安全極限電位差，但齊納管不會(huì)被擊穿，因?yàn)锳和E間的電位差沒(méi)變，因而起不到保護(hù)作用。這時(shí)如果不小心現(xiàn)場(chǎng)的信號(hào)線碰到外殼上，就可能引起火花，可能會(huì)點(diǎn)燃周?chē)目扇夹詺怏w，這樣的系統(tǒng)也就不具備本安性能了。

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