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子的傳動(dòng)設(shè)備相配合，并與西門子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