我們新研制出一種用于紙漿白度測定的智能白度儀，該儀表采用西門子公司生產(chǎn)的S7-224 CPU結(jié)合軟件功能進行數(shù)據(jù)處理，具有較好的可靠性、重復性、精確度和穩(wěn)定性。為了使其能與其它智能設備之間實現(xiàn)通信，我們將通過現(xiàn)場總線技術(shù)把它連接到網(wǎng)絡中，使它成為造紙廠現(xiàn)場總線控制系統(tǒng)的一部分。
2.現(xiàn)場總線的選擇
2.1現(xiàn)場總線技術(shù)的選擇
現(xiàn)場總線集控制技術(shù)、計算機技術(shù)、通信技術(shù)于一體，是當今自動化領域技術(shù)發(fā)展的熱點之一。這項技術(shù)可將多個智能控制儀表連接成網(wǎng)絡系統(tǒng)，實現(xiàn)分布式計算機控制，提高檢測和控制精度，改善系統(tǒng)的動態(tài)響應速度，提高系統(tǒng)安全性，從而得到了廣泛的應用。
近年來，幾種有影響的現(xiàn)場總線技術(shù)已在一些特定的應用領域里顯示出各自的優(yōu)勢。在此，我們選定了現(xiàn)為德國和歐洲標準的PROFIBUS（Process Fieldbus）現(xiàn)場總線。一方面由于它是目前數(shù)據(jù)傳輸率快的一種現(xiàn)場總線，傳輸率高可達12Mbps，另一方面它能夠很好的與西門子的傳動設備相配合，并與西門子PLC（Programmable Logic Controller）結(jié)合緊密且組態(tài)簡便。
2.2 PROFIBUS現(xiàn)場總線簡介
參照ISO/OSI參考模型,PROFIBUS現(xiàn)場總線只包含物理層、數(shù)據(jù)鏈路層和應用層。由PROFIBUS-DP，PROFIBUS-FMS， PROFIBUS-PA組成PROFIBUS系列。
PROFIBUS-DP：經(jīng)過優(yōu)化的高速、廉價的通信連接，專為自動控制系統(tǒng)和設備級分散I/O之間通信設計，使用PROFIBUS-DP模塊可取代價格昂貴的24V或0～20mA并行信號線。用于分布式控制系統(tǒng)的高速數(shù)據(jù)傳輸。
PROFIBUS-FMS ：解決車間級通用性通信任務，提供大量的通信服務，完成中等傳輸速度的循環(huán)和非循環(huán)通信任務，用于紡織工業(yè)、樓宇自動化、電氣傳動、傳感器和執(zhí)行器、可編程序控制器、低壓開關設備等一般自動化控制。
PROFIBUS-PA專為過程自動化設計，標準的本質(zhì)安全的傳輸技術(shù)，實現(xiàn)了IEC1158-2中規(guī)定的通信規(guī)程，用于對安全性要求高的場合及由總線供電的站點。
本設計中采用的是PROFIBUS-DP標準，PROFIBUS-DP（或DP標準）是由歐洲標準EN50170定義的一種遠程I/O通信協(xié)議。DP表示分布式外圍設備，亦即遠程I/O。PROFIBUS-DP還用到了應用層接口（ALI），ALI將過程對象轉(zhuǎn)換為通信對象。
Woodward SPM-A synchonizer 9907-029 REV.B
Woodward SPM-A synchonizer 9907-018 Rev. C
WOODWARD SPM-A (9905-001) SYNCHRONIZER WITH MANUAL
WOODWARD SPM SYNCHRONIZER, PN 8272-385,
WOODWARD SPM SYNCHRONIZER, PN 8271-610, EXC COND
Woodward SPM Synchronizer Model 8271-607A NNB
WOODWARD SPM SYNCHRONIZER 8272-190-C
Woodward Speed Setting Potentiometer Bracket Assembly 5438-121 NOS
WOODWARD SOLENOID VALVE 8402-238
WOODWARD SOLENOID VALVE 8402-214 5852-159
WOODWARD SOLENOID VALVE 5852-130
WOODWARD SOLENOID VALVE 5852-130
WOODWARD SOLENOID SYNCHRO-START # SA-3187 NSN: 5945-01-280-5477 # 1503-24C6U4BS
WOODWARD SOLENOID PART # SA-1637-24 NSN: 5945-01-048-9774
Woodward Servo Postion Controller 8200-226 Rev B
Woodward SEG IRD1-G Transformator Differezialschutz
woodward rotary direct drive vallve
WOODWARD RESISTOR ASSEMBLY # 9900-350 NSN: 5905-01-290-0002
Woodward PWM Gas Trim Valve P/N 8235-622
Woodward PVC Single Receptacle W/Hinged Cover #50-1651 15A 120V Twist Lock ()
WOODWARD PROTECH 203 OVERSPEED PROTECTION SYSTEM 9907-149 ()
Woodward ProTech 203 Overspeed Protection System 9905-990 Rev G With Key
Woodward ProTech 203 Overspeed Protection System 9905-990 Rev G No Key
Woodward Protech 203 Overspeed Protection System 9905-990 Rev G Missing 2 PS
Woodward Protech 203 Overspeed Protection System 8200-203 Rev N
WOODWARD PROTECH 203 OVERSPEED PROTECTION PN 9905-995
WOODWARD PROTECH 203 OVERSPEED PROTECTION PN 8200-301
WOODWARD PROCESS/IMPORT-EXPORT CONTROL, PN 9905-090, EXC COND
WOODWARD Process Import-Export Control (Part #9905-090 H) EXC COND
WOODWARD PREREGULATOR FUSE 3AG.75AMP
Woodward PM Motor Control 8272-536
Woodward Piston Part # 3525-039
WOODWARD PGD GOVERNOR A8556-749 PS, 320-600 RPM, S/N: 1111611 (REFURBISHED)
WoodWard PG Lever Governor S/N: 420991
WOODWARD PEAK 150 DIGITAL STEAM TURBINE CONTROLLER 9905-867 REV-J NNB
Woodward Part # 8272-288 0 Load Sharing Speed Controller 2301A
Woodward Netcon 5000 Input Module 5464-333
WOODWARD NETCON 5000 DISCREET OUTPUT MODULE, EXC COND
WOODWARD NETCON 5000 CPU MODULE, , EXCELLENT COND
WOODWARD NETCON 5000 ACTUATOR DRIVER OUTPUT MODULE,EXC
WOODWARD NETCON 5000 (PART # 5464-588) SERIAL #11459522
WOODWARD MOTOR OPERATED POTENTIOMETER P/N 9900-229 NSN 5905-01-086-2714
Woodward Module 5466-409
WOODWARD MILITARY PGD DIAL GOVERNOR; P/N: 9900-149 ~~GOV~SURPLUS~
WOODWARD MILITARY PG DIAL GOVERNOR; P/N: 9900-149 ~~SURPLUS~
WOODWARD MILITARY P.G. DIAL GOVERNOR; P/N: 9900-149 ~~SURPLUS~
Woodward MFR 11 Multifunktionsrelais Netzüberwachungsrelais Netzüberwachung NEU
Woodward MFR 1 RELAY
Woodward Master Synchronizer and Load Control 9907-004 Rev N
Woodward Master Synchronizer and Load Control 9905-797 Rev M
WOODWARD LOAD SHARING AND SPEED CONTROL, PN 9905-068, EXC COND
WOODWARD LOAD SHARING AND SPEED CONTROL, PN 8272-288, /UN
WOODWARD LOAD SHARING AND SPEED CONTROL 8271-652, EXC COND
WOODWARD LOAD SHARING AND SPEED CONTROL 8271-467, EXC COND
Woodward Industrial Turbine Fuel Control Valve Driver 8200-216
Woodward Hydraulic Governor pn.5178938
Woodward HRT Inc. - Stainless Steel Hydraulic Service Plug - P/N: 41001748 (NOS) Charity item
WoodWard Governors (3) UG 8 (1) PG Lever
WOODWARD GOVERNOR, 8561-252, PSG, 5101888, DETROIT DIESEL
Woodward Governor w/ Bodine Electric Co Motor for Detriot Diesel - P/N: 8561-537
WoodWard Governor UG 8
Woodward Governor Type UG-8 PN: 34381 NOS
WOODWARD GOVERNOR TYPE PG-PL PUMP CONTROL 8552-674,
WOODWARD GOVERNOR TURBINE ELECTRICAL CONTROL ASSEMBLY, MODEL 8230-621
WOODWARD GOVERNOR TM-100 DIGITAL DRIVER DUAL 8200-150
WOODWARD GOVERNOR SPEED SETTING PISTON 361324
WOODWARD GOVERNOR SG GOVERNOR P/N 8511-453 /UN
Woodward Governor Piston Rod P/N 364521
Woodward Governor Piston & Rod P/N 3561-073, 9987-878 NOS
Woodward Governor PG-PL PGPL 8572-565 Un Large Engine Generator Turbine
Woodward Governor PG-PL P/N 8572-212 Waukesha P/N 295493 Brand In Box
Woodward Governor Part # 8240-005 Serial # 1088064
Woodward Governor P/N A8240-449 Diesel Engine REMANUFACTURED
Woodward Governor P/N A8240-298 Diesel Engine
Woodward Governor P/N 1247-007 Connector
Woodward Governor Oil Gauge Site Glass 1832-109 NOS
Woodward Governor Gas Shutoff Valve 9905-451
Woodward GOVERNOR for Military generator p/n 8561-301, 371156, 2990-00-085-5624
Woodward GOVERNOR for Military 100KW Cat Generator MEP007A D333C p/n 8510-212
WOODWARD GOVERNOR FLOW CALIBRATED VALVE CONTROL DIESEL GENERATOR 5233-507
Woodward Governor Field Terminal Module 5437-080
Woodward Governor Field Terminal Module 5437-079
Woodward Governor Field Terminal Module 5437-052
Woodward governor EGB-13P, PN: 8540-381
Woodward Governor EGB-13P, PN: 8240-381
WOODWARD GOVERNOR DYNA-CONTROLLER PART NUMBER 8270-1010
WOODWARD GOVERNOR DPG-2401-002 CUMMINS EFC ACTUATOR
WOODWARD GOVERNOR CONTROL SA-3682-AN-2 SPEED SWITCH
WOODWARD GOVERNOR CONTROL PANEL 8271-353 2301 SPEED SENSOR NOS
Woodward Governor Company 5503-267 RT S/0 Module Netcon IIIB 3 9 pin
Woodward Governor Company 5466-353 Rev. A Transceiver Module
Woodward Governor Company 5464-643 Rev. D D/I Module
Woodward Governor Company 2201 5417-038 Rev A 6’ Cable
Woodward Governor Company - Speed Adjusting Sleeve - P/N: 040323 (NOS) Charity item
Woodward Governor Company - Speed Adjusting Sleeve - P/N: 040323 (NOS) Charity item
WOODWARD GOVERNOR BASE # 4008-517 NSN: 2990-01-033-7530
Woodward Governor Actuator EG1P ( EG-1P) E8250-826
WOODWARD GOVERNOR 8577-102 US 104816
Woodward Governor 8512-133
WOODWARD GOVERNOR 8272-164 8272164
WOODWARD GOVERNOR 8271-468 D **
WOODWARD GOVERNOR 8 CHANNEL RELAY MODULE P/N 5441-673
Woodward Governor 5466-258 Module Simplex Discrete I/O
WOODWARD GOVERNOR 5462-757 C Indicator Board
WOODWARD GOVERNOR 5 AMP RELAY INTERFACE P/N 5441-637
WOODWARD GOVERNOR 28 CHANNEL RELAY MODULE P/N 5441-407
Woodward Governor / 5441-693 Module 24 IN 12 OUT
Woodward Governor / 5417-178 CABLE MICRONET HIGH DENSITY ANALOG/DISCRETE
Woodward Governor / 5417-045 NETCON 20 FT DISCRETE W/ BACKS
Woodward Governor / 5417-033 NETCON LOW DENSITY ANALOG BLACK
Woodward Governor - 8239-082 Rev E - Load Sharing Interface Module
Woodward Governor - 5466-353 Rev C - Transceiver Module
Woodward Governor - 5464-544 Rev E - 4 Channel Actuator Control Module
Woodward Governor - 5464-414 Rev NW - Speed Sensor Module
Woodward Governor - 5464-414 Rev B - Speed Sensor Module
Woodward Governor - 5464-211 Rev D - 2 Channel Actuator Control Module
Woodward Governor - 5464-210 Rev D - 2 Channel Actuator Control Module
Woodward Governor - 5464-132 Rev B - FC198 Co-Pro
Woodward Governor - 5464-013 Rev G - RTD Input Module
Woodward Governor - 5463-785 Rev J - Isolated 4-20 mA Analog Input Module
Woodward Governor - 5463-581 Rev H - 8 Channel Isolated 4-20 mA Input Module
Woodward Governor - 5463-473 Rev D - DCS 4.4 SIO OPSYS Module
Woodward Governor - 5461-655 Rev H - Fuel Valve Final Driver Module
Woodward Governor - 5461-648 Rev F - 2 Channel Actuator Control Module
Woodward Governor - 5437-092 Rev F - Netcon Expansion Chassis Power Supply
Woodward Governor - 5437-079 Rev A - Field Terminal Module
Woodward Governor - 5417-028 Rev A - Cable
Woodward Governor
WOODWARD GOVERNER STRAIGHT SHAFT # 032487 NSN: 3040-01-198-1072
Woodward Governer Company Control Board # 8270-238 ( 671 or 971 diesel motor )
Woodward Governer Co Import Control 8271-570
WOODWARD GOVENOR P.G.A. DRIVE SPEED 300-960RPM NICE
WOODWARD GENERATOR LOADING CONTROL 8271-488 D
WOODWARD GENERATOR LOAD SENSOR MODEL 8290-048 F -- CLEAN
WOODWARD GENERATOR LOAD SENSOR 8290-048 // 3074-47IC
Woodward Generator Diesel Engine Speed Governor UG8 420-1255 RPM
Woodward Generator Diesel Engine Speed Governor UG8 350/375-1255 RPM (2)
Woodward Generator Controller MFR1 Diesel Controller Monitor MFR15 8440-1771
Woodward GENERATOR 9907-021 Rev. 2301A Load Sharing And Speed Control
Woodward Gas Shutoff Valve P/N 9905-891 2" Warranty Fast Shipping
Woodward Fuel Valve Liquified Turbine 771-615-90001 or 8004-230 Fuel Control
WOODWARD FINAL DRIVER, PN 8230-815, EXC COND
WOODWARD EXPLOSION PROOF SOLENOID VALVE 5852-149
Woodward Ethernet Interface FTM 5453-754
Woodward EPG Speed Control Steuerger?t 8290-045 Rev. E1 --
Woodward Engine- Governor- UG8
Woodward Engine Governor 8290-205 EPG Speed Control
WoodWard Electro-Mechanical Linear Actuator 10202-000-0-24 30KW 60KW Generator
Woodward Electrical Governor Actuator #8250-570 42 Degrees (NIB)
Woodward Electrical Governor Actuator #8250-570 42 Degrees (Factory Re-Furbished
WOODWARD EG-M CONTROL P/N 8270-916 SURPLUS
Woodward EGCP-2 8406-120 Rev G Generator Control Panel Digital - CAT
Woodward EG-A Governor Controller #9908-003 120 VAC 50/60 Hz
Woodward EG-10P Actuator 9900-294
Woodward EG Remote Sump Motor Assy 8250-390 Servo 8250-102 Actuator AR9900-217GH
Woodward EG Remote Actuator AR9900-217GH for use with 8250-102
WOODWARD EASYGEN-1000
Woodward Easygen 3000 Genset Controller 8440-1831H
WOODWARD DYNA SPEED CONTROLLER 10502-001 8270-1096 GOVENOR CONTROL BOX
WOODWARD DYNA 8000 ELECTRONIC GOVERNOR SYSTEMS 24 VOLT MECHANICAL ACTUATOR
Woodward DSM Synchroniser 8239-002
Woodward Drehzahlregler für Deutz S/BA/M 528 Schiffsmotoren
woodward digital synchronizer and load control 9905-797
WOODWARD DIGITAL REMOTE FINAL DRIVER 8239-006
WOODWARD DIGITAL REMOTE FINAL DRIVER (DRFD) PN 8239-005
Woodward Digital Remote Final Driver (DRFD) 8239
WOODWARD DIGITAL REFERENCE UNIT 8272-683 ELECTRONIC CONTROL OF SIGNAL VOLTAGE
WOODWARD DIGITAL REFERENCE UNIT 8272-683 ELECTRONIC CONTROL OF SIGNAL VOLTAGE
Woodward Dental Extracting Forceps 3FS Lower Molars
Woodward Dental Extracting Forceps 3FS Lower Molars
Woodward C8516-040 4500 RPM TG Governor NIB
Woodward Automatic Power Transfer and Load Control 9905-007 PARTS/REPAIR
Woodward Automatic Power Transfer and Load Control 9905-007 N
WOODWARD AUTOMATIC POWER TRANSFER AND LOAD CONTROL 9905-007
Woodward Automatic Power Transfer and Load Con 9905-007
WOODWARD AUTOMATIC GENERATOR LOADING CONTROL, PN 9905-096, EXC COND
Woodward Automatic Generator Loading Control 9905-096 H -
WOODWARD AUTOMATIC GENERATOR LOADING CONTROL 9905-096
WOODWARD AUTO POWER TRANSFER & L.C., 9905-007 / 171-057
Woodward Atlas Controller w/Profibus Module
WOODWARD A8556-749 PS GOVERNOR, 300-650 RPM, S/N: 2208540 (REFURBISHED)
WOODWARD 9907-838 9907838
WOODWARD 9907-252 9907252
WOODWARD 9907-252 9907252
WOODWARD 9907-029 9907029
Woodward 9907-029 Rev E - SPM-A Synchronizer *Gebraucht*
WOODWARD 9907-028 9907028
Woodward 9907-028 SPM-A Synchronizer Load Sharing Module 115/230V / Warranty
Woodward 9907-028 Revision F SPM-A SYNCHRONIZER
Woodward 9907-028 Revision D SPM-A SYNCHRONIZER
WOODWARD 9907-027 9907027
Woodward 9907-018 Rev. C 2301 A Load Sharing and Speed Control Good
Woodward 9907-005 Rev. G Master Synchronizer & Load Control
WOODWARD 9907-005 9907005
WOODWARD 9905-971 9905971
WOODWARD 9905-970 9905970
WOODWARD 9905-969 9905969
Woodward 9905-797 Digital Synchronizer and Load Control Rev B
WOODWARD 9905-796 9905796
WOODWARD 9905-795 9905795
WOODWARD 9905-760 9905760
Woodward 9905-711 Rev. L Digital Synchronizer and Load Control DSLC
Woodward 9905-708 Digital Synchronizer and Load Control Rev L
WOODWARD 9905-373 9905373
Woodward 9905-373 Rev. T Digital Synchronizer and Load Control DSLC
Woodward 9905-373 Rev. T Digital Synchronizer and Load Control DSLC
WOODWARD 9905-367 9905367
WOODWARD 9905-204A DSM DIGITAL SPEED MATCHING SYNCHRONIZER 120V-AC 6A B240206
WOODWARD 9905-111 9905111
WOODWARD 9905-096 9905096
WOODWARD 9905-096 J AUTOMATIC GENERATOR LOADING CONTROL GOOD TAKEOUT
Woodward 9905-096 Automatic Generator Loading Control 9905096 Rev. J 115 230 VAC
WOODWARD 9905-096 / 9905-096J / J / AUTOMATIC GENERATOR LOADING CONTROL
WOODWARD 9905-092 9905092
WOODWARD 9905-092 / 9905-092K / K / PROCESS IMPORT EXPORT CONTROL
WOODWARD 9905-068C 9905068C
WOODWARD 9905-068 9905068
WOODWARD 9905-068 / 9905-068B / B
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