我們新研制出一種用于紙漿白度測(cè)定的智能白度儀，該儀表采用西門(mén)子公司生產(chǎn)的S7-224 CPU結(jié)合軟件功能進(jìn)行數(shù)據(jù)處理，具有較好的可靠性、重復(fù)性、精確度和穩(wěn)定性。為了使其能與其它智能設(shè)備之間實(shí)現(xiàn)通信，我們將通過(guò)現(xiàn)場(chǎng)總線技術(shù)把它連接到網(wǎng)絡(luò)中，使它成為造紙廠現(xiàn)場(chǎng)總線控制系統(tǒng)的一部分。
2.現(xiàn)場(chǎng)總線的選擇
2.1現(xiàn)場(chǎng)總線技術(shù)的選擇
現(xiàn)場(chǎng)總線集控制技術(shù)、計(jì)算機(jī)技術(shù)、通信技術(shù)于一體，是當(dāng)今自動(dòng)化領(lǐng)域技術(shù)發(fā)展的熱點(diǎn)之一。這項(xiàng)技術(shù)可將多個(gè)智能控制儀表連接成網(wǎng)絡(luò)系統(tǒng)，實(shí)現(xiàn)分布式計(jì)算機(jī)控制，提高檢測(cè)和控制精度，改善系統(tǒng)的動(dòng)態(tài)響應(yīng)速度，提高系統(tǒng)安全性，從而得到了廣泛的應(yīng)用。
近年來(lái)，幾種有影響的現(xiàn)場(chǎng)總線技術(shù)已在一些特定的應(yīng)用領(lǐng)域里顯示出各自的優(yōu)勢(shì)。在此，我們選定了現(xiàn)為德國(guó)和歐洲標(biāo)準(zhǔn)的PROFIBUS（Process Fieldbus）現(xiàn)場(chǎng)總線。一方面由于它是目前數(shù)據(jù)傳輸率快的一種現(xiàn)場(chǎng)總線，傳輸率高可達(dá)12Mbps，另一方面它能夠很好的與西門(mén)子的傳動(dòng)設(shè)備相配合，并與西門(mén)子PLC（Programmable Logic Controller）結(jié)合緊密且組態(tài)簡(jiǎn)便。
2.2 PROFIBUS現(xiàn)場(chǎng)總線簡(jiǎn)介
參照ISO/OSI參考模型,PROFIBUS現(xiàn)場(chǎng)總線只包含物理層、數(shù)據(jù)鏈路層和應(yīng)用層。由PROFIBUS-DP，PROFIBUS-FMS， PROFIBUS-PA組成PROFIBUS系列。
PROFIBUS-DP：經(jīng)過(guò)優(yōu)化的高速、廉價(jià)的通信連接，專(zhuān)為自動(dòng)控制系統(tǒng)和設(shè)備級(jí)分散I/O之間通信設(shè)計(jì)，使用PROFIBUS-DP模塊可取代價(jià)格昂貴的24V或0～20mA并行信號(hào)線。用于分布式控制系統(tǒng)的高速數(shù)據(jù)傳輸。
PROFIBUS-FMS ：解決車(chē)間級(jí)通用性通信任務(wù)，提供大量的通信服務(wù)，完成中等傳輸速度的循環(huán)和非循環(huán)通信任務(wù)，用于紡織工業(yè)、樓宇自動(dòng)化、電氣傳動(dòng)、傳感器和執(zhí)行器、可編程序控制器、低壓開(kāi)關(guān)設(shè)備等一般自動(dòng)化控制。
PROFIBUS-PA專(zhuān)為過(guò)程自動(dòng)化設(shè)計(jì)，標(biāo)準(zhǔn)的本質(zhì)安全的傳輸技術(shù)，實(shí)現(xiàn)了IEC1158-2中規(guī)定的通信規(guī)程，用于對(duì)安全性要求高的場(chǎng)合及由總線供電的站點(diǎn)。
本設(shè)計(jì)中采用的是PROFIBUS-DP標(biāo)準(zhǔn)，PROFIBUS-DP（或DP標(biāo)準(zhǔn)）是由歐洲標(biāo)準(zhǔn)EN50170定義的一種遠(yuǎn)程I/O通信協(xié)議。DP表示分布式外圍設(shè)備，亦即遠(yuǎn)程I/O。PROFIBUS-DP還用到了應(yīng)用層接口（ALI），ALI將過(guò)程對(duì)象轉(zhuǎn)換為通信對(duì)象。
IDEC IZBARL IBRC-6012R RELAY BARRIER 16VDC 14mA 250VAC
G79601 Shimadzu SCL-10AVP HPLC System Controller
Enlarge
Shimadzu HPLC System: Freight/ Ground Shipping Possible
SHIMADZU VP HPLC DETECTOR AUTOSAMPLER CHROMATOGRAPH
Shimadzu SCL-10A VP System Controller
Shimadzu SPD-M10Avp HPLC UV/VIS Diode Array DAD
Shimadzu UV-1201 UV-Vis Spectrophotomet?er UV1201
Shimadzu SIL-10A XL HPLC Autosampler
Shimadzu HPLC System: Freight/ Ground Shipping Possible
Shimadzu 10A & VP Series DAD HPLC System
Shimadzu SCL-10A VP System Controller S-R
Shimadzu UV-Visable Recording Spectrophotomet?er UV160U
Shimadzu SPD-10A(vp) Prep Flow Cell
Shimadzu Liquid Chromatograph LC-4A 115VAC 10A 50/60 HZ
Shimadzu RF-540 Spectrofluoroph?otometer & DR-3 Recorder
Shimadzu SCL-10A HPLC System Controller Lab Waters S-R
SHIMADZU MODEL LC-6A LIQUID CHROMATOGRAPH Unit Used
Shimadzu UV-260 UV/VIS Doublebeam-Spec?trometer UV-260
Shimadzu LC10-AT VP HPLC Pump Liquid Chromatograph
Shimadzu LC10-AT VP HPLC Pump Liquid Chromatograph
Shimadzu TMP2003LMC turbo pump
turbo pump, AMAT pump,
SHIMADZU MODEL LC-6A LIQUID CHROMATOGRAPH
Shimadzu SCL-10A System Controller HPLC VP SCL10A LC UV
SHIMADZU UV1601 SPECTROPHOTOMET?ER TESTED
SHIMADZU LC-600 DUAL PUMP LIQUID CHROMATOGRAPH
Shimadzu Chromatograph LC-10AD CDD-6A SCL-10A SIL-10A
SHIMADZU GC17AAF WITH FID DETECTOR SOLD AS IS
Shimadzu SIL-10A Syringe Auto Injector HPLC Cooler Rack
Shimadzu SCL-10A System Controller
Expedited shipping available
Shimadzu Total Organic Carbon Analyzer TOC-4000
MOUNTING BRACKET FOR SHIMADZU AOC AUTOSAMPLER TRAY
Shimadzu FRC-10A Fraction Collector S-R
Shimadzu LC-10AD vp SCL-10A vp FCV-14AH Subcontrol LOT
Shimadzu Flame Photometric Detector
Shimadzu AA680U Atomic Absorption Flame Emission Spec
Shimadzu SIL-10A AutoInjector Autosampler LC SCL 10A VP
SHIMADZU SCL-10A SYSTEM CONTROLLER # 3219
Shimadzu Syringe Pump SIL-10A Auto Injector HPLC LC VP
Shimadzu SCL 10-A System Controller S-R
G79602 Shimadzu LC-10ADVP HPLC Liquid Chromatograph
Enlarge
Shimadzu FCV-10-AL-VP Low Pressure Gradient Valve S-R
Shimadzu UV-160U UV-VIS Recording Spectrophotomet?er
G79603 Shimadzu DGU-14A HPLC Degasser
Enlarge
Shimadzu VP Series HPLC
Shimadzu UV-2101PC Scanning Spectrophotomet?er UV2101PC
Includes CPS-260 Cell Positioner
G79604 Shimadzu 228-34736-91 Reservoir Tray
Enlarge
Shimadzu LC10-AT VP HPLC Pump Liquid Chromatograph
SHIMADZU SCL-6B System Controller Chromatograph HPLC
Shimadzu AA680U Atomic Absorption Flame Emission Spec?
Enlarge
SHIMADZU UV-VISIBLE RECORDING SPECTROPHOTOMET?ER
Shimadzu IR-460 DR-11 Cat No 204-08700-01 U-S
Shimadzu LC10-AT VP HPLC Pump Liquid Chromatograph
Shimadzu SIL-10AP AutoInjector SIL-10A Autosampler LC
Shimadzu Auto Injector SIL-6B w/ SCL-6B System Control
SHIMADZU TOC-5000 Total Organic Carbon Analyzer
with Data System-- Tested-Working?-Guaranteed!
One-day shipping available
Enlarge
Shimadzu LC-10ADvp HPLC Pump
Shimadzu RF-535 Fluorescence Detector HPLC Monitor
SHIMADZU MODEL LC-6A LIQUID CHROMATOGRAPH
Shimadzu RF-551 Spectrofluorome??tric Detector
Shimadzu SIL-10AXL autoinjector,sy?ringe pump, FCV-10AL
Shimadzu Spectrophotomet?er DR-15 RF-5000u
SHIMADZU UV-1601 PC UV-VISIBLE SPECTROPHOTOMET?ER
Shimadzu GC-14A GAS CHROMATOGRAPH USED SPL FID install
Shimadzu HPLC HDU-1 Liquid Chromatograph
SHIMADZU RACK FOR SIL-10ADVP (AND OTHER) AUTOSAMPLER
Shimadzu FCV-10AL Degasser Pump Unit Used
Shimadzu UV160U Recording Spectrophotomet?er UV-160U
Shimadzu LC10-AT VP HPLC Pump Liquid Chromatograph
SHIMADZU XRD-6000 X-RAY DIFFRACTOMETER NICE
SHIMADZU UV-160 UV VISIBLE RECORDING SPECTROPHOTOMET?ER
Shimadzu CTO -6A Column Oven HPLC Lab Use
Shimadzu SCL 10A HPLC System Controller
Shimadzu SIL-10A HPLC Auto Injector Sampler Cooler Rack
SHIMADZU SPD-6AV UV-VIS SPECTROPHOTOMET?RIC DETECTOR
SHIMADZU LC-600 LIQUID CHROMATOGRAPH
SHIMADZU UV-1601 PC SPECTROPHOTOMET?ER W/ CPS 240A
Nice Shimadzu CTO-10ASVP CTO-20AS VP Column Oven
Make me an OFFER-I have other Shimadzu Equipment listed
Enlarge
Shimadzu Visable Recording Spectrophotomet?er UV-160U
SHIMADZU RF-530 SPECTROFLUOROPH?OTOMETER MONITOR
Shimadzu HPLC cooler cooling unit sample
GC Shimadzu Split/Splitless Liner 5 pk Restek 20956-213
Shimadzu LC-10AT Liquid Chromatograph HPLC Flow Pump
SHIMADZU AUTO INJECTOR MODEL# ADC-17!
Shimadzu PC-12D-A Assy Board, 222-00978-92, ST3-15-8
Shimadzu TOC-5000A Total Organic Carbon Analyzer
?Shimadzu RF-1501 Spectrophotomet?er Micro oly wil█Fluor
Shimadzu Centrifugal Particle Size Analyzer SA-CP3
Shimadzu GC-14A All Purpose Gas Chromatograph System
Shimadzu Sipper 160 With Accessories And Carry Case
Shimadzu FRC-10A Fraction Collector for HPLC
Shimadzu TCC-240A Temperature Controller
LOT OF 2 SHIMADZU CONTROLLERS MODEL# CFC-14PM!
Shimadzu ELECTROCHEMICAL DETECTOR HPLC L-ECD-6A
Shimadzu Liquid Chromatography Pump Model LC-6A
Shimadzu RF-551 PC Spectrofluorome?tric HPLC Detector
Shimadzu RF-535 Fluorescence Detector HPLC
RF5301PC Shimadzu Spectrofluoroph?otometer 381 hours use
SAVE $14,000 Includes Computer, Flow Thru HPLC cell
Shimadzu HPLC degasser degassing unit degas DGU-3A
Shimadzu RF-535 Lab HPLC Monitor Fluorescence Detector
Shimadzu SCL-10A System Controller
SHIMADZU SPECTROPHOTOMET?ER UV-160
Altex Shimadzu 901 HPLC Chromatograph Integrator
Shimadzu SIL-HTa LC Autosampler SILHTa SILHTc HTc HT
Shimadzu UV-160 Spectrophotomet?er CPS-260 Controller Z
Shimadzu SIL-2A AutoSampler SIL-2AS Control Unit Used
SHIMADZU LC-600 Dual Pump HPLC Liquid Chromatograph
Shimadzu UV-260 UV-Visible Recording Spectrophotomet?er
Shimadzu SCL-6B System Controller
Shimadzu SIL-10AF Autosampler
SHIMADZU SCL-6A DETECTOR WITH AUTO INJECTOR SIL-6A
Shimadzu SPD 6A UV Spectrophotomet?ric Detector HPLC UV
Shimadzu GC Autoinjector&Vi?al Carousel AOC 20i,20s EUC
|
在線咨詢(xún) 
在線客服：0571-87774297
