描述

AD207AV

?要提高現(xiàn)場輸入給PLC信號的可靠性，首先要選擇可靠性較高的變送器和各種開關，防止各種原因引起傳送信號線短路、斷路或接觸不良。其次在程序設計時增加數(shù)字濾波程序，增加輸入信號的可信性。

? ? 在現(xiàn)場輸入觸點后加一定時器，定時時間根據(jù)觸點抖動情況和系統(tǒng)要的響應速度確定，一般在幾十ms，這樣可保證觸點確實穩(wěn)定閉合后，才有其它響應。模擬信號濾波可采用圖2b程序設計方法，對現(xiàn)場模擬信號連續(xù)采樣3次，采樣間隔由A/D轉換速度和該模擬信號變化速率決定。3次采樣數(shù)據(jù)分別存放在數(shù)據(jù)寄存器DT10、DT11、DT12中，當最后1次采樣結束后利用數(shù)據(jù)比較、數(shù)據(jù)交換指令、數(shù)據(jù)段比較指令去掉最大和最小值，保留中間值作為本次采樣結果存放在數(shù)據(jù)寄存器DT0中。

? ? 提高讀入PLC現(xiàn)場信號的可靠性還可利用控制系統(tǒng)自身特點，利用信號之間關系來判斷信號的可信程度。如進行液位控制，由于儲罐的尺寸是已知的，進液或出液的閥門開度和壓力是已知的，在一定時間里罐內液體變化高度大約在什么范圍是知道的，如果這時液位計送給PLC的數(shù)據(jù)和估算液位高度相差較大，判斷可能是液位計故障，通過故障報警系統(tǒng)通知操作人員檢查該液位計。又如各儲罐有上下液位極限保護，當開關動作時發(fā)出信號給PLC，這個信號是否真實可靠，在程序設計時我們將這信號和該罐液位計信號對比，如果液位計讀數(shù)也在極限位置，說明該信號是真實的；如果液位計讀數(shù)不在極限位置，判斷可能是液位極限開關故障或傳送信號線路故障，同樣通過報警系統(tǒng)通知操作人員處理該故障。由于在程序設計時采用了上述方法，大大提高了輸入信號的可靠。

產(chǎn)品承諾：
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優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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15天包退換一年質保大量現(xiàn)貨? 國內實力庫存商家

AD207AV

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