MVI71-MNET

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描述

MVI71-MNET

輸入信號(hào)可靠性研究
? ? 要提高現(xiàn)場(chǎng)輸入給PLC信號(hào)的可靠性，首先要選擇可靠性較高的變送器和各種開(kāi)關(guān)，防止各種原因引起傳送信號(hào)線短路、斷路或接觸不良。其次在程序設(shè)計(jì)時(shí)增加數(shù)字濾波程序，增加輸入信號(hào)的可信性。
? ? 在現(xiàn)場(chǎng)輸入觸點(diǎn)后加一定時(shí)器，定時(shí)時(shí)間根據(jù)觸點(diǎn)抖動(dòng)情況和系統(tǒng)要的響應(yīng)速度確定，一般在幾十ms，這樣可保證觸點(diǎn)確實(shí)穩(wěn)定閉合后，才有其它響應(yīng)。模擬信號(hào)濾波可采用圖2b程序設(shè)計(jì)方法，對(duì)現(xiàn)場(chǎng)模擬信號(hào)連續(xù)采樣3次，采樣間隔由A/D轉(zhuǎn)換速度和該模擬信號(hào)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(dāng)最后1次采樣結(jié)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(jié)果存放在數(shù)據(jù)寄存器DT0中。
? ? 提高讀入PLC現(xiàn)場(chǎng)信號(hào)的可靠性還可利用控制系統(tǒng)自身特點(diǎn)，利用信號(hào)之間關(guān)系來(lái)判斷信號(hào)的可信程度。如進(jìn)行液位控制，由于儲(chǔ)罐的尺寸是已知的，進(jìn)液或出液的閥門(mén)開(kāi)度和壓力是已知的，在一定時(shí)間里罐內(nèi)液體變化高度大約在什么范圍是知道的，如果這時(shí)液位計(jì)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(jì)故障，通過(guò)故障報(bào)警系統(tǒng)通知操作人員檢查該液位計(jì)。又如各儲(chǔ)罐有上下液位極限保護(hù)，當(dāng)開(kāi)關(guān)動(dòng)作時(shí)發(fā)出信號(hào)給PLC，這個(gè)信號(hào)是否真實(shí)可靠，在程序設(shè)計(jì)時(shí)我們將這信號(hào)和該罐液位計(jì)信號(hào)對(duì)比，如果液位計(jì)讀數(shù)也在極限位置，說(shuō)明該信號(hào)是真實(shí)的；如果液位計(jì)讀數(shù)不在極限位置，判斷可能是液位極限開(kāi)關(guān)故障或傳送信號(hào)線路故障，同樣通過(guò)報(bào)警系統(tǒng)通知操作人員處理該故障。由于在程序設(shè)計(jì)時(shí)采用了上述方法，大大提高了輸入信號(hào)的可靠。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
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優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。

主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌：ABB???,AB??,GE,FOXBORO,本特利，英維思，伍德沃德，西屋，瑞恩，施耐德，西門(mén)子，摩托羅拉，安川。力士樂(lè)。ACSO，橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家

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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊

PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅

15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家


選擇深圳長(zhǎng)欣，選擇放心，售后無(wú)憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營(yíng)：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè)，ACSO，力士樂(lè)等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”（不管能不能看懂，先了解個(gè)大概，以便學(xué)習(xí)編程時(shí)查找）；
2、由位控邏輯入手，逐漸增加定時(shí)、計(jì)數(shù)等條件，把或、與、非關(guān)系理順；
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個(gè)物理回路驗(yàn)證，比如變頻器+電機(jī)+測(cè)速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時(shí)也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會(huì)一種至于其它的學(xué)習(xí)起來(lái)也就簡(jiǎn)單了。

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