NTU-7Q2E

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描述

NTU-7Q2E

采用性能優(yōu)良的電源,抑制電網(wǎng)引入的干擾
? ? 在PLC控制系統(tǒng)中,電源占有極重要的地位。電網(wǎng)干擾串入PLC控制系統(tǒng)主要通過PLC系統(tǒng)的供電電源(如CPU電源、I/O電源等)、變送器供電電源和與PLC系統(tǒng)具有直接電氣連接的儀表供電電源等耦合進(jìn)入的?,F(xiàn)在,對(duì)于PLC系統(tǒng)供電的電源,一般都采用隔離性能較好電源,而對(duì)于變送器供電的電源和PLC系統(tǒng)有直接電氣連接的儀表的供電電源,并沒受到足夠的重視,雖然采取了一定的隔離措施,但普遍還不夠,主要是使用的隔離變壓器分布參數(shù)大,抑制干擾能力差,經(jīng)電源耦合而串入共模干擾、差模干擾。所以,對(duì)于變送器和共用信號(hào)儀表供電應(yīng)選擇分布電容小、抑制帶大(如采用多次隔離和屏蔽及漏感技術(shù))的配電器,以減少PLC系統(tǒng)的干擾。
? ? 此外,位保證電網(wǎng)饋點(diǎn)不中斷,可采用在線式不間斷供電電源(UPS)供電,提高供電的安全可靠性。并且UPS還具有較強(qiáng)的干擾隔離性能,是一種PLC控制系統(tǒng)的理想電源。
? ? 2、電纜選擇的敖設(shè)
? ? 為了減少動(dòng)力電纜輻射電磁干擾,尤其是變頻裝置饋電電纜。筆者在某工程中,采用了銅帶鎧裝屏蔽電力電纜,從而降低了動(dòng)力線生產(chǎn)的電磁干擾,該工程投產(chǎn)后取得了滿意的效果。
? ? 不同類型的信號(hào)分別由不同電纜傳輸,信號(hào)電纜應(yīng)按傳輸信號(hào)種類分層敖設(shè),嚴(yán)禁用同一電纜的不同導(dǎo)線同時(shí)傳送動(dòng)力電源和信號(hào),避免信號(hào)線與動(dòng)力電纜靠近平行敖設(shè),以減少電磁干擾。
? ? 3、硬件濾波及軟件抗如果措施
? ? 由于電磁干擾的復(fù)雜性,要根本消除迎接干擾影響是不可能的,因此在PLC控制系統(tǒng)的軟件設(shè)計(jì)和組態(tài)時(shí),還應(yīng)在軟件方面進(jìn)行抗干擾處理,進(jìn)一步提高系統(tǒng)的可靠性。常用的一些措施:數(shù)字濾波和工頻整形采樣,可有效消除周期性干擾;定時(shí)校正參考點(diǎn)電位,并采用動(dòng)態(tài)零點(diǎn),可有效防止電位漂移;采用信息冗余技術(shù),設(shè)計(jì)相應(yīng)的軟件標(biāo)志位;采用間接跳轉(zhuǎn),設(shè)置軟件陷阱等提高軟件結(jié)構(gòu)可靠性。
? ? 信號(hào)在接入計(jì)算機(jī)前,在信號(hào)線與地間并接電容,以減少共模干擾;在信號(hào)兩極間加裝濾波器可減少差模干擾。
? ? 對(duì)干較低信噪比的模擬量信號(hào).常因現(xiàn)場(chǎng)瞬時(shí)干擾而產(chǎn)生較大波動(dòng),若僅用瞬時(shí)采樣植進(jìn)行控制計(jì)算會(huì)產(chǎn)生較大誤差,為此可采用數(shù)字濾波方法。
? ? 現(xiàn)場(chǎng)模擬量信號(hào)經(jīng)A/D轉(zhuǎn)換后變成離散的數(shù)字信號(hào),然后將形成的數(shù)據(jù)按時(shí)間序列存入PLC內(nèi)存。再利用數(shù)字濾波程序?qū)ζ溥M(jìn)行處理,濾去噪聲部分獲得單純信號(hào),可對(duì)輸入信號(hào)用m次采樣值的平均值來代替當(dāng)前值,但井不是通常的每采樣。次求一次平均值,而是每采樣一次就與最近的m-l次歷史采樣值相加,此方法反應(yīng)速度快,具有很好的實(shí)時(shí)性,輸入信號(hào)經(jīng)過處理后用干信號(hào)顯示或回路調(diào)節(jié),有效地抑制了噪聲干擾。
? ? 由干工業(yè)環(huán)境惡劣,干擾信號(hào)較多,I/O信號(hào)傳送距離較長(zhǎng),常常會(huì)使傳送的信號(hào)有誤。為提高系統(tǒng)運(yùn)行的可靠性,使PLC在信號(hào)出錯(cuò)倩況下能及時(shí)發(fā)現(xiàn)錯(cuò)誤,并能排除錯(cuò)誤的影響繼續(xù)工作,在程序編制中可采用軟件容錯(cuò)技術(shù)。
? ? 4、正確選擇接地點(diǎn),完善接地系統(tǒng)
? ? 接地的目的通常有兩個(gè),其一為了安全,其二是為了抑制干擾。完善的接地系統(tǒng)是PLC控制系統(tǒng)抗電磁干擾的重要措施之一。
? ? 系統(tǒng)接地方式有:浮地方式、直接接地方式和電容接地三種方式。對(duì)PLC控制系統(tǒng)而言,它屬高速低電平控制裝置,應(yīng)采用直接接地方式。由于信號(hào)電纜分布電容和輸入裝置濾波等的影響,裝置之間的信號(hào)交換頻率一般都低于1MHz,所以PLC控制系統(tǒng)接地線采用一點(diǎn)接地和串聯(lián)一點(diǎn)接地方式。集中布置的PLC系統(tǒng)適于并聯(lián)一點(diǎn)接地方式,各裝置的柜體中心接地點(diǎn)以單獨(dú)的接地線引向接地極。如果裝置間距較大,應(yīng)采用串聯(lián)一點(diǎn)接地方式。用一根大截面銅母線(或絕緣電纜)連接各裝置的柜體中心接地點(diǎn),然后將接地母線直接連接接地極。接地線采用截面大于22mm2的銅導(dǎo)線,總母線使用截面大于60mm2的銅排。接地極的接地電阻小于2Ω,接地極最好埋在距建筑物10~15m遠(yuǎn)處(或與控制器間不大于50m),而且PLC系統(tǒng)接地點(diǎn)必須與強(qiáng)電設(shè)備接地點(diǎn)相距10m以上。
? ? 信號(hào)源接地時(shí),屏蔽層應(yīng)在信號(hào)側(cè)接地;不接地時(shí),應(yīng)在PLC側(cè)接地;信號(hào)線中間有接頭時(shí),屏蔽層應(yīng)牢固連接并進(jìn)行絕緣處理,一定要避免多點(diǎn)接地;多個(gè)測(cè)點(diǎn)信號(hào)的屏蔽雙絞線與多芯對(duì)絞總屏電纜連接時(shí),各屏蔽層應(yīng)相互連接好,并經(jīng)絕緣處理。選擇適當(dāng)?shù)慕拥靥巻吸c(diǎn)接點(diǎn)。

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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
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COMPAQ 147090-001 2 PORT SERVER CONSOLE SWITCH RACK OPT

COMPAQ 158413-001 HSJ80 CONTROLLER MODULE

COMPAQ 349201-001 HP DL380-G3 (1)2.8GHZ CPU/1GB MEMORY

CRAY FPX4802-02S CRAY FRAME RELAY ENCRYPTOR

CRAY FPX4802/DES CRAY FRAME RELAY ENCRYPTOR

CRAY 905-5241-XXX CRAY FRAME RELAY ENCRYPTOR

CRAY 905-5241-004 CRAY FRAME RELAY ENCRYPTOR

DEC 12-42827-01 ALPHASERVER 8200 BLOWER ASSY

DEC 3X-DGSRK-AB QUAD PORT SERIAL MODULE

DEC 54-22463-03 DEFZA-CA BOARD

DEC 54-23461-01 AS8200 SERIAL DATA PORT

DEC 54-22605-01 BREAKOUT MODULE

DEC 54-15020-01 BACKPLANE

DEC 54-23302-19 CONTROL PANEL BLUE BUTTON

DEC 54-22509-01 DGLTA-FA

DEC 54-24413-01 DWP64 PCI MODULE

DEC 54-24729-01 SECONDARY BREAKOUT

DEC 54-24756-03 DEC DS20E MOTHERBOARD

DEC 54-22907-02 DEC HSD30 DSSI SCSI CONTROLLER

DEC 54-24889-01 CONTROLLER MODULE

DEC 54-24725-01 ALPHA XLT300 MLB

DEC 54-22092-03 486 CPU MODULE

DEC 54-30684-01 MODULE

DEC 54-24758-02 ALPHA DP264 DAUGHTER CARD

DEC 54-30358-01 DS20 MODULE

DEC 54-24034-05 DUAL PROCESSOR CARD

DEC 54-30158-06 ES40 500MHZ CPU MODULE

DEC 70-23098-01 VAX 8550 BACKPLANE BOARD

DEC 54-25088-03 XP1000 CPU MODULE

DEC 70-31458-01 DEC HSD30 DSSI SCSI CONTROLLER

DEC 70-16486-00 BACKPLANE

DEC 70-33523-01 DS-SWXRA-GH CONTROLLER SHELF

DEC 70-32195-03 SWXRC-05 CONTROLLER MODULE

DEC 70-32866-02 INTELLIGENT EMU 3P

DEC 70-40057-S1 HSJ80 CONTROLLER MODULE

DEC 70-40057-01 HSJ80 CONTROLLER MODULE

DEC 748-0135-F4 FIBRE OPTICAL CONTROLLER MODUL

DEC 748-0124-A2 CONTROLLER ODULE

DEC BA700 SLIDERS VAX7000/BA700 MOUNTING SLIDERS

DEC BA350-KA STORAGE

DEC DEBET-RQ LANBRIDGE 150 FIBER 240V

DEC DEFCN-AD DECCONCENTRATOR 500

DEC DEFCN-AC DECCONCENTRATOR 500 W/OBM

DEC DEFEB-AC DEC BRIDGE 510

DEC BA356-LE BLUE MODULAR EXPANSION

DEC H7202-KB DEC PDP11/84 POWER SUPPLY

DEC DEPCM WIDGET

DEC DS-TL890-NE DLT EXPANSION UNIT(RACK MOUNT)

DEC DEFCN-CA OPTICAL BOARD

DEC H777 PDP 11 POWER SUPPLY

DEC DSRZE-AA MUXSERVER 320 W/COVERS

DEC DEXBR-Z ROUTEABOUT ACCESS EI

DEC DSRZD-AA MUXSERVER 380

DEC DSRVX-M DECSERVER 900 MC

DEC H4202-B POWER SUPPLY

DEC HA205-AA MULTISWITCH700/?SMARTSWITC 6000/6500 POWER

DEC M7199-AH MODULE

DEC MTXNA-AA DEC POS M32SX PRINTER

DEC MS7CC-FT 2 GB MEMORY MODULE ALPHASERVER

DEC MS7CC-FP 2 GB MEMORY MODULE ALPHASERVER

DEC MS340-CA 256MB MEMORY SYNCH(4X64)-DS2?0

DEC MS7CC-FH 2 GB MEMORY MODULE ALPHASERVER

DEC QTS25 MT CONTROLLER MODULE

DEC SF73-LA STORAGE UNIT W/2 -RF73 DISKS

DEC PMAGD-CA GRAPHICS MODULE

DEC SWSA1-AB SE/FAST SCSI-2 ADAPTER MODULE

DEC PR0350-AA CONSOLE CONTROLLER

DEC T2026 XMI TO 11 DAL INTERFACE

DEC RF73-JA RF73-EA IN CANISTER FOR:

digital link DES-3326 10/100/1000FAST ETHERNET SWITCH

FORCE 106093 FORCE PMC-VGA MODULE

EMC 005041086 CLARIION BBU

HEWLETT PACKARD A6255-69001 HP LINK CONTROLLER CARD

HEWLETT PACKARD A3453-60003 HP K400 SYSTEM CARD

HEWLETT PACKARD A6255-60001 HP LINK CONTROLLER CARD

HEWLETT PACKARD C1199-44400 HP SCSI/DIFF DLT4000 INT

HEWLETT PACKARD D9143-63004 TL6000R I/O BASE BOARD

HEWLETT PACKARD D9143-60008 TL6000R I/O BASE BOARD

HEWLETT PACKARD D9143-69004 TL6000R I/O BASE BOARD

IBM 08J5803 IBM 2003 DC CONVERTER

IBM 09L1650 IBM 4-P MODULE W/4MB CACHE MOD

IBM 44H2744 IBM AC/DC BULK PWR REGULATOR

IBM 44H2743 IBM BPR-5M AC/DC BULK POWER RE

IBM 51H9023 IBM DCA-MM DC/DC CONVERTER

IBM 60H0440 IBM QJ26 9672CARD

IBM 59H4120 IBM 20/40GB 8MM INT TAPE DRIVE

IBM 59H4119 IBM 20/40GB 8MM INT TAPE DRIVE

IBM 93H6187 IBM 7015-XXX POWER SUPPLY AC

IBM 38L1186 INFOPRINT 40 CNTROLLER BOARD

IBM 46H8932 IBM QD92 9672CARD

IBM 60H0570 IBM QL66 9672CARD

IBM 74G9771 IBM 9402 AS400 BACKPLANE W CAG

IBM 97H6491 IBM 7017 4-WAY PROCESSOR UNIT

MADGE 157-159-02 SMART RINGSWITCH, 112 SWITCH

MISC 92-00460-XX AURORA MULTIPORT

MISC 92-00400-XX AURORA MULTIPORT MODEL 3200SE

MISC 2T-QCS02-AA 2-PORT SERVER CONSOLE

MISC 6210925-01 TL81X MAGAZZINE

MISC 905-5242-022 MULTI-RATE CSU/DSU *NEW*

MISC 6210911-01 TL81X MAGAZZINE

MISC 45040433 MDB SYS. MLSI-DR11-W PLUS

NATIONAL INSTRUMENTS 179055-01 NATIONAL INST. MODULE

NORTEL 113724 ADVANCED REMOTE NODE

PRINTRONIX 144712-001 PRINTRONIX P6080 POWER SUPPLY

OVERLAND 106025-001 TKZ63 RACK MOUNT KIT*NEW*

NATIONAL INSTRUMENTS 179056-01 NATIONAL INSTRUM. GPIB M

QUANTUM TH6XA-EE DLT7000 35/70GB LIB/LOADER

QUANTUM DLT7000 35/70GB INTERNAL DLT

QMS/MINOLTA 1710122-001 OPC BELT CARTRIDGE

QUALSTAR 500983-01-0 QUALSTAR 4440 8MM BARCODE READ

SUN 370-2435-02 SUN, DIFF. SCSI ARRAY CONTROL

QUALSTAR 500826-03-7 QUALSTAR 4440 TAPE DRIVE PWS

SUN 370-2435 SUN, DIFF. SCSI ARRAY CONTROL

QMS 2293040 QMS PS-2000 CONTROL BOARD

COMPAQ 154851-001 ESL9326D GRAPHICAL DISPLAY

HEWLETT PACKARD C2473S 670MB SCSI/SE HARD DRIVE

QUANTUM 6310827-01 ESL9326D GRAPHICAL DISPLAY

293360-B21/3059?83-001 HP SR2122 ISCSI STORAGE ROUTER

HP A6873B RX2600 DUAL ITANIUM2 1.5GHZ BASE SYTEM

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、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的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)起來也就簡(jiǎn)單了。