A-B 1771-IBD

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描述

A-B 1771-IBD
?PLC的CPU模塊通過系統(tǒng)總線（一般做在基板的印刷電路上）與裝插在基板上的各種I/O模塊、特殊功能模塊、通信模塊等交換數(shù)據(jù)，裝插的模塊越多，CPU模塊與那些模塊之間的數(shù)據(jù)交換的時(shí)間就會(huì)增加。這種數(shù)據(jù)交換的時(shí)間的增加，在一定程度上會(huì)使PLC的掃描時(shí)間加長(zhǎng)。因此，有必要采取以下措施使系統(tǒng)總線傳輸速度高速化：增加系統(tǒng)總線的帶寬使一次傳輸?shù)臄?shù)據(jù)量增多，例如三菱電機(jī)的小Q系列PLC，增加了系統(tǒng)總線的帶寬，使所傳輸?shù)臄?shù)據(jù)量是以前的2倍；在系統(tǒng)總線存取的方式上，采用連續(xù)成組傳送技術(shù)實(shí)現(xiàn)連續(xù)數(shù)據(jù)的高速批量傳送，大大縮短了存取每個(gè)字所需的時(shí)間；通過向與系統(tǒng)總線相連接的模塊實(shí)現(xiàn)全局傳送，即針對(duì)多個(gè)模塊同時(shí)傳送同一數(shù)據(jù)，有效地用活了系統(tǒng)總線。該空間的主要部分用于存放工作數(shù)據(jù)稱為數(shù)據(jù)存儲(chǔ)器，另外有一部分作寄存器使用稱為數(shù)據(jù)對(duì)象。

數(shù)據(jù)存儲(chǔ)器它包括變量存儲(chǔ)器（V），輸入信號(hào)緩存區(qū)（輸入映象存儲(chǔ)器I），輸出信號(hào)緩沖區(qū)（輸出映象存儲(chǔ)區(qū)Q），內(nèi)部標(biāo)志位存儲(chǔ)器（M）又稱內(nèi)部輔助繼電器，特殊標(biāo)志位存儲(chǔ)器（SM）。除特殊標(biāo)志位外，其他部分都能以位、字節(jié)、和雙字的格式自由讀取或?qū)懭?。變量存?chǔ)器（V）是保存程序執(zhí)行過程中控制邏輯操作的中間結(jié)果，所有的V存儲(chǔ)器都可以存儲(chǔ)在永久存儲(chǔ)器區(qū)內(nèi)，其內(nèi)容可在與EEPROM或編程設(shè)備雙向傳送。
輸入映象存儲(chǔ)器（I）是以字節(jié)為單位的寄存器，它的每一位對(duì)應(yīng)于一個(gè)數(shù)字量輸入結(jié)點(diǎn)。在每個(gè)掃描周期開始，PLC依次對(duì)各個(gè)輸入結(jié)點(diǎn)采樣，并把采樣結(jié)果送入輸入映象存儲(chǔ)器。PLC在執(zhí)行用戶程序過程中，不再理會(huì)輸入結(jié)點(diǎn)的狀態(tài)，它所處理的數(shù)據(jù)為輸入映象存儲(chǔ)器中的值。
輸出映象存儲(chǔ)器（Q）是以字節(jié)為單位的寄存器，它的每一位對(duì)應(yīng)于一個(gè)數(shù)字輸出量結(jié)點(diǎn)。PLC在執(zhí)行用戶程序的過程中，并不把輸出信號(hào)隨時(shí)送到輸出結(jié)點(diǎn)，而是送到輸出映象存儲(chǔ)器，只有到了每個(gè)掃描周期的末尾，才將輸出映象寄存器的輸出信號(hào)幾乎同時(shí)送到各輸出結(jié)點(diǎn)。使用映象寄存器優(yōu)點(diǎn)：①同步地在掃描周期開始采樣所有輸入點(diǎn)，并在掃描的執(zhí)行階段凍結(jié)所有輸入值；②在程序執(zhí)行完后再?gòu)挠诚蠹拇嫫魉⑿滤休敵鳇c(diǎn)，使被控系統(tǒng)能獲得更好穩(wěn)定性；⑧存取映象寄存器的速度高于存取I/O速度，使程序執(zhí)行的更快；④I/O點(diǎn)只能以位為單位存取，但映象寄存器則能以位、字節(jié)、雙字進(jìn)行存取。因此，映象寄存器提供了更高的靈活性。另外對(duì)控制系統(tǒng)中個(gè)別I/O點(diǎn)要求實(shí)時(shí)性較高的情況下，可用直接I/O指令直接存取輸入/輸出點(diǎn)。

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
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MISC VX15A-A9 VXT2000 TERMINAL

NEC 4650NX SUPERSCRIPT 4650NX COLOR PRINT

NEC 4650N SUPERSCRIPT COLOR PRINTER

NORTEL NTFN33CC-03 NORTEL PASSPORT CP MODULE

ATL 6205017-01 DEC 29-33672-01 TL820/TL893 PASS-THRU

QUANTUM 6201310-02 TL82X/TL893 EXTENSION AXIS ASY W/PW

QMS/MINOLTA 5250145-200 MAGICOLOR 2 DESKLASER PRINTER S

QUANTUM 6201310 TL82X/TL893 EXTENSION AXIS ASY W/PWA

SUN 300-1106 SUN, 800WATTS POWER SUPPLY

QUALSTAR 500657-01-0 QUALSTAR 4440 CONTROLLER BD

QUALSTAR 500656-01-2 QUALSTAR 4440 CONTROLLER BD

DEC 54-30194-02 H7511 H-SWITCH POWER CONVERTER

DEC SQ703 Q-BUS CONTROL

IBM 21P4511 IBM 6-WAY 600MHZ RS64 IV PROC.MODULE

COMPAQ 401663-004 CPQ 35/70GB SCSI/SE DAT AIT35

COMPAQ DGSRC-AA GS/ROUTER 64MB SCP MODULE

COMTROL 96500-8 COMTROL ROCKETPORT RM16 RJ45

DEC 54-19441-01 DETMM-M MOTHERBOARD

DEC 54-24105-01 PCI TO 2 FW MOTHER BOARD

DEC 54-30348-01 PRIVATEER MEMORY RISER

DEC 70-29333-02 BA7XX BACKPLANE MODULE

DEC 70-32887-01 DAGWG-AA GIGASWITCH

DEC DS-TZS20-VW 25/50 GB AIT TAPE DRIVE SBB

DEC DS-TL891-NE TL891 DLT LIBRARY 1 DRIVE RACKMOUNT

DEC DTC07-AA DECTALK PC SPEECH

DEC LN02X-BB LN02X-BB

DEC M3123-00 CXF32-M

DEC MS330-GA 2GB MEMORY AS4100 60N/SEC

DEC PMASD-CA GRAPHICS MODULE

DEC SWXTA-BL 32GB 4MM DLT TAPE LOADER

HEWLETT PACKARD 5064-3657 HP VISUALIZE-FX6 VIDEO BOARD

HEWLETT PACKARD A6322-69001 HP ULTRIUM 230 LTO (LVDS) T

HEWLETT PACKARD A6322-67001 HP ULTRIUM 230 LTO (LVDS) T

KENTROX 72521 KENTROX 521 E1 2-PORT DSU/CSU

LUCENT 810-00342-02 LUCENT GX250 DOWN LINK BOARD

MISC 108856-bb24 CPQ TFT5010 LCD MONITOR FOR RA

ZNYX ZX478-A6 ZNYX CPCI ETH8000 MODULE

DEC KDJ11-BF PDP 11/83-84 CPU J11 CPU 18MHz W/ FPJ11-AA

SUN STOREDGE L280 DLT7000 370-3423 AUTOLOADER 540-3722

DEC 54-20710-01 BACKPLANE MODULE

DEC 54-24305-01 DTCC07 MODULE

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。

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