GE DS200PCCAG6ACB
安全柵的接地:我們回過頭來再看圖3.4.13所示的安全柵線路圖。從圖中可以看出有三個接地點:B,E,D,通常B和E兩點都在計算機這一側??梢赃B在一起,形成一點接地。而D點是變送器外殼在現(xiàn)場的接地,若現(xiàn)場和控制室兩接地點間有電位差存在,那么, D點和E點的電位就不同了。假設我們以E作為參考點,假定是D點出現(xiàn)10V的電勢,此時,A點和E點的電位仍為24V,那么A和D間就可能有34V的電位差了,己超過安全極限電位差,但齊納管不會被擊穿,因為A和E間的電位差沒變,因而起不到保護作用。這時如果不小心現(xiàn)場的信號線碰到外殼上,就可能引起火花,可能會點燃周圍的可燃性氣體,這樣的系統(tǒng)也就不具備本安性能了。
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