DI426

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描述

DI426

??PLC系統(tǒng)中的存儲(chǔ)器主要用于存放系統(tǒng)程序、用戶程序和工作狀態(tài)數(shù)據(jù)。PLC的存儲(chǔ)器包括系統(tǒng)存儲(chǔ)器和用戶存儲(chǔ)器。
? ? （1）系統(tǒng)存儲(chǔ)器
? ? 系統(tǒng)存儲(chǔ)器用來存放由PLC生產(chǎn)廠家編寫的系統(tǒng)程序，并固化在ROM內(nèi)，用戶不能更改。它使PLC具有基本的功能，能夠完成PLC設(shè)計(jì)者規(guī)定的各項(xiàng)工作。系統(tǒng)程序質(zhì)量的好壞很大程度上決定了PLC的性能。
? ? （2）用戶存儲(chǔ)器
? ? 用戶存儲(chǔ)器包括用戶程序存儲(chǔ)器（程序區(qū)）和數(shù)據(jù)存儲(chǔ)器（數(shù)據(jù)區(qū)）兩部分。用戶程序存儲(chǔ)器用來存放用戶針對具體控制任務(wù)采用PLC編程語言編寫的各種用戶程序。用戶程序存儲(chǔ)器根據(jù)所選用的存儲(chǔ)器單元類型的不同（可以是RAM、EPROM或EEPROM存儲(chǔ)器），其內(nèi)容可以由用戶修改或增刪。用戶數(shù)據(jù)存儲(chǔ)器可以用來存放（記憶）用戶程序中所使用器件的ON/OFF狀態(tài)和數(shù)據(jù)等。用戶存儲(chǔ)器的大小關(guān)系到用戶程序容量的大小，是反映PLC性能的重要指標(biāo)之一。
? ? 為了便于讀出、檢查和修改，用戶程序一般存于CMOS靜態(tài)RAM中，用鋰電池作為后備電源，以保證掉電時(shí)不會(huì)丟失信息。為了防止干擾對RAM中程序的破壞，當(dāng)用戶程序經(jīng)過運(yùn)行正常，不需要改變，可將其固化在只讀存儲(chǔ)器EPROM中?，F(xiàn)在有許多PLC直接采用EEPROM作為用戶存儲(chǔ)器。
? ? 工作數(shù)據(jù)是PLC運(yùn)行過程中經(jīng)常變化、經(jīng)常存取的一些數(shù)據(jù)。存放在RAM中，以適應(yīng)隨機(jī)存取的要求。在PLC的工作數(shù)據(jù)存儲(chǔ)器中，設(shè)有存放輸入輸出繼電器、輔助繼電器、定時(shí)器、計(jì)數(shù)器等邏輯器件的存儲(chǔ)區(qū)，這些器件的狀態(tài)都是由用戶程序的初始設(shè)置和運(yùn)行情況而確定的。根據(jù)需要，部分?jǐn)?shù)據(jù)在掉電時(shí)用后備電池維持其現(xiàn)有的狀態(tài)，這部分在掉電時(shí)可保存數(shù)據(jù)的存儲(chǔ)區(qū)域稱為保持?jǐn)?shù)據(jù)區(qū)。
? ? 由于系統(tǒng)程序及工作數(shù)據(jù)與用戶無直接聯(lián)系，所以在PLC產(chǎn)品樣本或使用手冊中所列存儲(chǔ)器的形式及容量是指用戶程序存儲(chǔ)器。當(dāng)PLC提供的用戶存儲(chǔ)器容量不夠用，許多PLC還提供有存儲(chǔ)器擴(kuò)展功能。
? ? 存儲(chǔ)器主要有兩種：一種是可讀/寫操作的隨機(jī)存儲(chǔ)器RAM，另一種是只讀存儲(chǔ)器或可擦除可編程的只讀存儲(chǔ)器ROM、PROM、EPROM和EEPROM。

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，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價(jià)格，大量現(xiàn)貨。

主營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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MAGNETIC POWER SUPPLY 3C120 PC BOARD ***NNB***

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MITSUBISHI NF-SK3350 CIRCUIT BREAKER 350AMP 3POLE*XLNT*

RELIANCE 0-58704 MAXPAK III DRIVER INTERFACE BD**XLNT**

RELIANCE 0-57300/B FIELD POWER MODULE***NIB***

DYNAPAR/DANAHER M060113/62-PMDF?-1024-T0 ROTOPULSER*NIB

MITSUBISHI FRA240E-2.2K-UL 3HP 460V AC DRIVE **NIB**

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CMC CLEVELAND BMR4045ARB00000?0AD PM SERVO MOTOR **NNB**

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SIEMENS 1FK6063-6AF71-1?SA0 SERVO MOTOR ****XLNT****

RELIANCE ELECTRIC 2GU41001 GP2000 1HP 460V AC DRIVE*NNB

BANNER LG10A65PIQ PHOTOELECTRIC LASER ***NIB***

INFIMATIC FREEDOM NC200 5PC750.1043-K01 PENDANT *NNB*

TELEMECANIQUE ATS23.D44N/ATS2?3D44N ALTISTART 3 **XLNT**

SIEMENS KSP-M44-A66 MACHINE CONTROLLER BOARD **NIB**

BARBER-COLMAN 80HA-00001-001-?0-00 P/F MODULE ***XLNT***

SIEMENS 6ES5 441-4UA14/6ES54?41-4YA14 DIG OUT MOD *NIB*

RELIANCE 1SU51003 SP500 3HP 575V AC CONTROLLER *NIB*

FANUC A16B-2202-0400 OPTION 2 PC BOARD W/ SUB CPU*XLNT*

AC TECH M1550C 5HP 590V INPUT MC SERIES AC DRIVE *XLNT*

PROFACE GP2301H-SC41-24?V TEACH PENDANT/DISPLAY **XLNT**

KEYENCE CV-751P CV751P OPERATOR INTERFACE **XLNT**

ABB ACS501-009-5-00?P210000 7.5HP 380-500V AC DRIVE*NIB*

RELIANCE 0-51839-4 IRCE RELAY MODULE**NIB**

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? 國內(nèi)實(shí)力庫存商家


選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：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”（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)起來也就簡單了。

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