EI813F 3BDH000022R1 工控PLC系統(tǒng)模塊 現(xiàn)貨 全新原裝

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EI813F 3BDH000022R1 工控PLC系統(tǒng)模塊 現(xiàn)貨 全新原裝

?通過硬件和軟件偵聽的方法,分析PLC內(nèi)部固有的PPI通訊協(xié)議,然后上位機采用VB編程,遵循PPI通訊協(xié)議,讀寫PLC數(shù)據(jù),實現(xiàn)人機操作任務(wù)。這種通訊方法,與一般的自由通訊協(xié)議相比,省略了PLC的通訊程序編寫,只需編寫上位機的通訊程序資源
S7-226的編程口物理層為RS-485結(jié)構(gòu),SIEMENS提供MicroWin軟件,采用的是PPI(Point to Point)協(xié)議,可以用來傳輸、調(diào)試PLC程序。在現(xiàn)場應(yīng)用中,當(dāng)需要PLC與上位機通訊時,較多的使用自定義協(xié)議與上位機通訊。在這種通訊方式中,需要編程者首先定義自己的自由通訊格式,在PLC中編寫代碼,利用中斷方式控制通訊端口的數(shù)據(jù)收發(fā)。采用這種方式,PLC編程調(diào)試較為煩瑣,占用PLC的軟件中斷和代碼資源,而且當(dāng)PLC的通訊口定義為自由通訊口時,PLC的編程軟件無法對PLC進行監(jiān)控,給PLC程序調(diào)試帶來不便。SIEMENS S7-200PLC的編程通訊接口,內(nèi)部固化的通訊協(xié)議為PPI協(xié)議,如果上位機遵循PPI協(xié)議來讀寫PLC,就可以省略編寫PLC的通訊代碼。如何獲得PPI協(xié)議?可以在PLC的編程軟件讀寫PLC數(shù)據(jù)時,利用第三個串口偵聽PLC的通訊數(shù)據(jù),或者利用軟件方法,截取已經(jīng)打開且正在通訊的端口的數(shù)據(jù),然后歸納總結(jié),解析出PPI協(xié)議的數(shù)據(jù)讀寫報文。這樣,上位機遵循PPI協(xié)議,就可以便利的讀寫PLC內(nèi)部的數(shù)據(jù),實現(xiàn)上位機的人機操作功能。軟件設(shè)計

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HP PROLIANT DL360 G4 378705-001 2*3.6GHZ 2GB 2*73GB 15K

LUCENT FLEXENT CDMA BASEBAND RADIO CBR 850 44WR28 4:4

EMERSON 1450W POWER SUPPLY HRS1450-9000B 1450 WATT

SYMBOL MC9062 RUGGED WIRELESS COMPUTER SCANNER TERMINAL

POWERTRONICS PQR D50 POWER MONITOR QUALITY RECORDER!!!

HP/COMPAQ DELTA 1085W SWITCHING POWER SUPPLY DPS-1085AB

HP PROLIANT SERVER DL380 G4 2 * 3.2GHZ 6GB 2* 72GB 15K!

JUST CAVALLI ITTIERRE LONG DRESS BLACK SZ 40/6 NEW NWT

JUST CAVALLI ITTIERRE LONG DRESS LIME SIZE 40/6 NEW NWT

JUST CAVALLI ITTIERRE LONG DRESS LIME SIZE 42/8 NEW NWT

JUST CAVALLI ITTIERRE LONG DRESS LIME SIZE 38/4 NEW NWT

HUNTER PALOMAR 60″ AMBER BRONZE CEILING FAN 23765 NEW!!

ZYWAN CELLULAR ROUTING MODEM ZYWAN-GPRS1001 BRAND NEW

DOLCE & GABBANA WHITE JACKET WOMENS SZ 46 MSRP$2750 NWT

EXTREME NETWORKS F32FI 52021 SWITCH MODULE BRAND NEW!!!

HP 300GB 6G SAS 10K 2.5″ HARD DRIVE 518194-002 NEW!!!

HP ASSY EXPANSION PWR CHASSIS A5861-62027 NEW REFURB!!!

LUCENT FLEXENT CDMA RF TRANSMITTER AMPLIFIER KS24638-L1

SEVCON MILLIPAK MOTOR CONTROLLER PART# 633C23502

XP POWER AC/DC 600W SMD600PS24 24V/25A POWER SUPPLY NEW

BOSTON ACOUSTICS SOUNDWARE XS 5.1 SPEAKER SYSTEM


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,福克斯波羅、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,機器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學(xué)習(xí)編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(shù)等條件,把或、與、非關(guān)系理順;
3、進而練習(xí)整數(shù)運算、實數(shù)運算、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(最好是有個物理回路驗證,比如變頻器+電機+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)機器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。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)會一種至于其它的學(xué)習(xí)起來也就簡單了。