AB 1771-IND
dcs和plc的表現(xiàn)的主要差別是在開關量的邏輯解算和模擬量的運算上,即使后來兩者相互有些滲透,但是還是有區(qū)別。80年代以后,plc除邏輯運算外,控制回路用的算法功能已經大大加強,但 plc用梯形圖編程,模擬量的運算在編程時不太直觀,編程比較麻煩。但在解算邏輯方面,表現(xiàn)出快速的優(yōu)點,在微秒量級,解算1k邏輯程序不到1毫秒。它把所有的輸入都當成開關量來處理,16位(也有32位的)為一個模擬量。而dcs把所有輸入都當成模擬量,1位就是開關量。解算一個邏輯是在幾百微秒至幾毫秒量級。對于plc解算一個pid運算在幾十毫秒,這與dcs的運算時間不相上下。
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