我们新研制出一种用于纸浆白度测定的智能白度仪，该仪表采用西门子公司生产的S7-224 CPU结合软件功能进行数据处理，具有较好的可靠性、重复性、精确度和稳定性。为了使其能与其它智能设备之间实现通信，我们将通过现场总线技术把它连接到网络中，使它成为造纸厂现场总线控制系统的一部分。

2.现场总线的选择

  2.1现场总线技术的选择

  现场总线集控制技术、计算机技术、通信技术于一体，是当今自动化领域技术发展的热点之一。这项技术可将多个智能控制仪表连接成网络系统，实现分布式计算机控制，提高检测和控制精度，改善系统的动态响应速度，提高系统安全性，从而得到了广泛的应用。

  近年来，几种有影响的现场总线技术已在一些特定的应用领域里显示出各自的优势。在此，我们选定了现为德国和欧洲标准的PROFIBUS（Process Fieldbus）现场总线。一方面由于它是目前数据传输率快的一种现场总线，传输率高可达12Mbps，另一方面它能够很好的与西门子的传动设备相配合，并与西门子PLC（Programmable Logic Controller）结合紧密且组态简便。

  2.2 PROFIBUS现场总线简介

  参照ISO/OSI参考模型,PROFIBUS现场总线只包含物理层、数据链路层和应用层。由PROFIBUS-DP，PROFIBUS-FMS， PROFIBUS-PA组成PROFIBUS系列。

  PROFIBUS-DP：经过优化的高速、廉价的通信连接，专为自动控制系统和设备级分散I/O之间通信设计，使用PROFIBUS-DP模块可取代价格昂贵的24V或0～20mA并行信号线。用于分布式控制系统的高速数据传输。

  PROFIBUS-FMS ：解决车间级通用性通信任务，提供大量的通信服务，完成中等传输速度的循环和非循环通信任务，用于纺织工业、楼宇自动化、电气传动、传感器和执行器、可编程序控制器、低压开关设备等一般自动化控制。

  PROFIBUS-PA专为过程自动化设计，标准的本质安全的传输技术，实现了IEC1158-2中规定的通信规程，用于对安全性要求高的场合及由总线供电的站点。

  本设计中采用的是PROFIBUS-DP标准，PROFIBUS-DP（或DP标准）是由欧洲标准EN50170定义的一种远程I/O通信协议。DP表示分布式外围设备，亦即远程I/O。PROFIBUS-DP还用到了应用层接口（ALI），ALI将过程对象转换为通信对象。

ITE/Siemens B230 Circuit Breaker *USED*

MGM 750 KVA Substation 13800 x 480 3 Phase Dry Type

Kohler 100 KW 3 Phase 277/480 Volt Genset

Square D LC36400, I-Line Circuit Breaker 

Ward 750 KVA 13800 x 120/208 Padmount Transformer

Interstate 750 KVA 13800 x 480/277 Padmount Transformer

General Electric 250 Watt HPS Cobrahead M250R2

(10) P & S 690-IG Ivory Combination Device 2-SP switche

Distran Scale Rangematic Distance Finder

TIF 8800A Combustible Gas Detector

Makita 6095-D 9.6 Volt Battery Drill

Greenlee Model 93-1065 Light Meter

Greenlee/Kellem?s Large Pulling Basket 4.00 - 4.40 Inch

50' Extension Cord 12/3 Copper Triple Plug NEW

Rotary Phase Converter System 460 Volt

170 KW 3 Phase 277/480 Volt Natural Gas Genset

KEB F4 Frequency Invertor 

Geist Surge Protector Monitor Plug Strip

Geist Power Monitor Cord Strip #SPCN104-1025TL

ITE CC1B020 20 Amp 1 Pole 277/480 Volt Circuit Breaker

ITE CC3B015 15 Amp 3 Pole 277/480 Volt Circuit Breaker

ITE KPB3F120 1200 Amp 3 Pole Circuit Breaker

Siemens PXD63B160 1600 Amp 3 Pole Circuit Breaker

ITE CJD63B300 300A 3P Circuit Breaker

75VA 100/110/120 X 24 VCT Liebert E-007D TRANSFORMER

ACME 1 KVA 1PH 380/600 X 115/230 CAT# TA-2-81241, NEW

15 KVA 3PH 480X120/208 DRY TRANSFORMER *USED*

Step Down Transformer 75 KVA 3 Ph 240X480 TO 120/208 

Siemens HLD63F600 500 Amp Circuit Breaker w/ 500A Trip

ITE QJ2-B150 150 Amp 2 Pole 240 Volt Circuit Breaker

ITE QJ2-B125 125 Amp 2 Pole 240 Volt Circuit Breaker

ITE QJ22B225 225 Amp 2 Pole 240 Volt Circuit Breaker

ITE QJ22B150 150 Amp 2 Pole 240 Volt Circuit Breaker

ITE QJ22B125 125 Amp 2 Pole 240 Volt Circuit Breaker

ITE QJ3-H150 150 Amp 3 Pole 240 Volt Circuit Breaker

ITE QJ2-H150 150 Amp 2 Pole 240 Volt Circuit Breaker

Siemens B130 Circuit Breaker 

Siemens B120 20 amp Circuit Breaker 

ITE/Siemens B350 Circuit Breaker

ITE/Siemens QJH23B150 Circuit Breaker 

ITE/Siemens QJH23B200 Circuit Breaker 

Siemens QJ23B225H Circuit Breaker 

ITE/Siemens EE3 B10000S01 100 amp shunt trip breaker

ITE/Siemens EE3-B050 Circuit Breaker 

ITE/Siemens EE3-B040 Circuit Breaker 

Acme 150 KVA 3ph 600/347 X 480/277 Cat #T-2A-52713-1

(6) ITE/Siemens B220 Circuit Breakers *NEW*

ITE/Siemens BF120 GFI Circuit Breaker 

Westinghouse QBGF1020 Type BA 1p 20a Circuit Breaker

Cutler Hammer BAB3015 Type BA 3p 15a Circuit Breaker

Cutler Hammer BAB2030 Type BA 2p 30a Circuit Breaker

Westinghouse BAB2030 Type BA 2p 30a Circuit Breaker

Westinghouse BAB1015 Type BA 1p 15a Circuit Breaker

Cutler Hammer BAB1015 Type BA 1p 15a Circuit Breaker

Square D QO320 Black Face Circuit Breakers 

Shawmut TRS200R  

Shawmut TRS200R  

Siemens B120 Circuit Breakers *NEW*

Westinghouse BAB1020 Type BA 1P 20A Circuit Breaker

Cutler Hammer BAB1020 1P 20A Circuit Breaker type BA

Westinghouse QBGF1020 1P 20A Circuit Breaker type BA

Cutler Hammer QBGF1020 1P 20A Circuit Breaker type BA

(10) Square D QO115 Circuit Breaker  

(10) Square D QO120 Yellow Sq Circuit Breakers 

10 Square D QOB120 Yellow Sq Circuit Breaker 

Cutler Hammer CH115 Full Notch Circuit Breaker 

Acme T-2-53113-15, 3 KVA 1ph 600X120/240 Transformer

Square 5kva 1ph 600 X 120/240 CAT# 5S4F Transformer NEW

Asco Redhat 82106002 Shut Off Valve

Honeywell PTCC 9515 Micro Switch Contactor

Allen Bradley 1A06 Coil

Telemechanique LC1D12B7 Contactor

Square D 15S5H 15 KVA 1PH 600 X 120/240 Transformer NEW

Edwards 876-G5 Weatherproof Horn

Edwards 340-4N5 Adaptabel

Advance Centium Ballast, ICN-4P32-5C

(5) Philips MH400/U Metal Halide Lamps

1500 Watt Quartz Fixture

RAB 500 Watt Quartz Flood Light, Cat #QF500

Honeywell 198162EA Transformer

Cutler Hammer Def. Purpose Contactor, C25ENED425A

Advance REL-4P32-3C 120 Volt Electronic Ballast

Furnas Size 2.5 Starter, Open Type, 146P32AA71

Square D MB NQOD Panelboard, 225 Amp, 1 Phase

Square D NF430L2C MLO Panelboard, 250 Amp, 

Edwards 874-G5, 240 Volt Horn

FSC 121S-120A Rotating Amber Beacon

Omega CN8261-F1 Process Controller

EGS Hevi Duty HS10F7.5AS, 7.5 KVA Transformer

Square D 2S51F, 2 KVA 1PH 600 X 120/240 Transformer NEW

Square D 3S4F, 3 KVA 1PH 600 X 120/240 Transformer,NEW

Square D FA340601021 Circuit Breaker With Shunt Trip

Square D KA362251021 Circuit Breaker With Shunt Trip

Square D FJA34100 Circuit Breaker

Square D KC34225 Circuit Breaker NEW

Square D KC34200 Circuit Breaker

Square D FDA34030 Circuit Breaker

Square D FDA34100 Circuit Breaker

Square D Q232125H Circuit Breaker 

Cutler Hammer LT20425 Panel Board Cover

Cutler Hammer LT20365 Panel Board Cover

Square D FAL34060, 60 Amp Circuit Breaker

Square D FCL340801021, Circuit Breaker w/ Shunt Trip

Square D FAL340601021, Circuit Breaker W/ Shunt Trip

Cutler Hammer CP4SBC510A2, 1000 Amp Tap Box

Cutler Hammer PRL-1A, 225 Amp MLO Panelboard (Interior)

Cutler Hammer PRL-1A, 400 Amp MLO Panelboard (Interior)

Cutler Hammer LTEZV2036SF Panel Board Cover

Cutler Hammer LTEZV2048SF Panel Board Cover

Square D HU366, 600 Amp, 600 Volt Non Fused Disconnect

Cutler Hammer LTDD2060S Panel Board Cover

Cutler Hammer LTDD2048F Panel Board Cover

Hubbell 460R7W,60 Amp Pin & Sleeve Recepticle

Hubbell 4100R9W, 100 Amp Pin & Sleeve Recepticle

Hubbell 4100R7W, 100 Amp Pin & Sleeve Recepticle

Levitron 560R9W, 60 Amp Pin and Sleeve Recepticle

Hubbell 560R9W, 60 Amp Pin & Sleeve Recepticle

Square D EHB34040 Circuit Breaker *NEW SURPLUS*

Cutler Hammer LTDD2048S Panel Board Cover

Cutler Hammer LT20485 Panel Cover  

Allen Bradley Size 5 Starter, 509-FOD *USED*

Allen Bradley Size 6 Starter, 509-G0B *USED*

General Electric Size 5 Contactor, CR305GO**CAKH

General Electric Size 6 Contactor, CR305HHD**BA1H

Cutler Hammer HPG49755-A01, 800 Amp Tap Box 

Siemens 4300 Power Meter *USED*

15 KVA, 1 Phase, 240x480 X 120/240 Volt Transformer

GS Hevi Duty 63 KVA SCR Drive Trans,460X460Y/?266, 3 Ph

Siemens 30 KVA Transformer, 480 x 120/208 Volt

Square D 45 KVA, 480/277 x 208 Volt Transformer

Federal Pacific 37.5 KVA,480X120/208 3 Ph, Trans

Square D HU368, 1200 Amp Disconnect *NEW SURPLUS*

GE 25 KVA Transformer, 1 Phase 600X120/240 volt

Westinghouse 25 KVA Transformer, 600 x 120/240 Volt

ACME 25 KVA,600X120/240?, 1 Phase Trans

GS Hevi Duty 7.5 KVA, 575X575/332, 3 Ph Trans

REX 25 KVA, 1 Ph, 600X120/240 Volt Trans 

Marelco 55 KVA Transformer, 3 Phase, 208x240 X 400 Volt

Federal Pacific 10 KVA 240X480X120/240?, NEMA 3R, 1 Ph

Jefferson 25 KVA, 480X120/240, 1 Ph Trans *USED*

Square D 225 Amp Main Lug I-Line Panelboard *USED*

Federal Pacific 15 KVA, 3 Ph 480X460Y/277 Transformer 

GS Hevi Duty Electric 25 KVA 575X120/240 1PHTransformer

GE 150 KVA 600X277/480 Transformer, 3 Phase 

Hitran 27 KVA, 3 Phase, 208 x 120/208 Transformer

Sq D 15 KVA 600X120/240 Transformer, 1 Phase

Siemens SX312A10PL10, 1600 Amp Bus Duct *USED*

Siemens R310APG, 1000 Amp Bus Duct *USED*

Siemens SX312A10PL10, 1200 Amp Bus Duct *USED*

Square D 15 KVA, 1 Ph 600X120/240 Trans *NEW*

Square D 225 KVA Transformer, 3 Phase, 480 x 240 Volt

Sorgel/Square D 150 KVA Transformer, 600 x 120/208 Volt

MGM 150 KVA Transformer, 480 x 240 Volt, 3 Phase

Westinghouse 75 KVA Transformer, 600 x 120/208 Volt

REX 50 KVA 1 Phase 575x120/240 Transformer

Square D 45 KVA Transformer, 3 Phase, 480x480/277 Volt

Federal Pacific 15 KVA 3 Ph 480 X 460Y/126 DRY TRANS 

General Electric 15 KVA, 3 Ph 208X120/208 Transf *USED*

Hammond 15 KVA, 480X120/208 NEMA 3R, 3 Ph Trans*USED*

Hammond 112.5 KVA,3PH 480X120/208 NEMA 3R,Trans *USED*

Hammond 45 KVA,480X120/208 NEMA 3R, 3 Ph Trans *USED*

Hammond 30 KVA,480X120/208 NEMA 3R, 3 Ph Trans *USED*

Hammond 75 KVA,480X120/208 3 ph NEMA 3R Trans *USED*

GE 45 KVA 3PH 208X120/208 Cat #9T23B3093 DRY TRANS 

Cutler Hammer 30 KVA 3PH 480 X 120/208 V48M28T30EE NEW

Square D 800 Amp I-Line Main Lug Panelboard 

Square D 225 Amp, NQOD Main Lug Panelboard *USED*

ITE CE3-B100, 100 Amp Cordon Circuit Breaker NEW IN BOX

ITE CE3-B020, 20 Amp Cordon Circuit Breaker *NEW IN BOX

ITE CE3-B030, 30 Amp Cordon Circuit Breaker *NEW IN BOX

ITE HE3-B100, 100 Amp Circuit Breaker  

ITE JL3-T225 Trip Unit  

(5) Buss NOS80 Fuses  

(10) Gould/Shawmutt TR20R Fuses  

(5)Shawmutt TR100R Fuses  

Gould/Shawmut TRS-150R, 150 Amp Fuse *NEW*

GE LU70, Lot of 12** High Pressure Sodium Lamp *NEW*

ITE FJ3-B225, 225 Amp Circuit Breaker  

Square D EHB34030 Circuit Breaker *NEW SURPLUS*

Square D EHB34015 Circuit Breaker *NEW Surplus*

NEMA 4 Dual 5 HP Pump Control Panel *USED*

Siemens W4242L3225CU, Weatherproof Load Center 

Adalet XCE101408 Explosion Proof Junction Box *USED*

Adalet XCE121208 Explosion Proof Junction Box *USED*

Hoffman A8H12ALP, NEMA 12 Jic Box *NEW SURPLUS*

Weighman N12303012, Nema 12 Enclosure *NEW SURPLUS*

Cooper 225 KVA 3PH 13800 X 120/208 PAD MOUNT NEW

Air Compressor Products, #028-158DP3 *USED*

SQUARE D PXF361600G Main Circuit Breaker Switchboard

Cooper 75 KVA 1PH 13800GY/7979 X 120/240 NEW PAD MOUNT

RTE 100 KVA 1 Ph13800 X 120/240 Padmount Transformer 

RTE 50 KVA 1 Ph 13800 X 120/240 Padmount Transformer 

Cooper Padmount Transformer, 167 KVA, *USED*

Cooper 100 KVA 1 Ph 13800GY/7970 X 120/240 PAD MOUNT 

RTE 75 KVA 1 Ph 13800 X 120/240 Padmount Transformer 

Hoffman A30P24SS6 Enclosure Back Plate  

Siemens B220 Circuit Breaker 2p 20 amp 

ITE/Siemens B240 Circuit Breaker *USED*

Siemens B250 Circuit Breaker 

ITE/Siemens B320 Circuit Breaker 

ITE/Siemens B3100 Circuit Breaker *USED*

ITE/Siemens B360 Circuit Breaker *USED*

ITE/Siemens B330 Circuit Breaker *USED*

ITE - ET 225amp "K" Frame 225 amp Circuit Breaker USED

ITE - ET 225amp "K" Frame 200 amp Circuit Breaker USED

ITE - ET 225amp "K" Frame 175 amp Circuit Breaker USED

ITE -ET 100 "F" Frame 20 amp Circuit Breaker *USED*

ITE -ET 100 "F" Frame 50 amp Circuit Breaker *USED*

ITE -ET 100 "F" Frame 70 amp Circuit Breaker *USED*

ITE -ET 100 "F" Frame 90 amp Circuit Breaker *USED*

ITE JL63F400, 200 amp Circuit Breaker *USED*

ITE JL63F400, 250 amp Circuit Breaker *USED*

ITE JL63F400, 300 amp Circuit Breaker *USED*

Siemens Q120 Circuit Breaker *USED*

Siemens B120H Circuit Breaker 

GE DFPTQL4 50amp Bus Plug *USED*

Siemens SN426 600 Amp Fused Disconnect *USED*

Square D KAL362001021 Circuit Breaker, Grey Label *USED

Square D KHL36200 Circuit Breaker, Grey Label *USED

Square D KHL36225 Circuit Breaker, Black Label *USED

Square D KHL362251212 Circuit Breaker, Grey Label *USED

Square D KHL3625025DC161?6 Circuit Breaker *USED*

Square D KHL362501291 Circuit Breaker *USED*

Square D KHL36250 Circuit Breaker *USED*

Square D KCL34150 I-Line Circuit Breaker *USED*

Square D KCL34225 I-Line Circuit Breaker *USED*

Square D KA36150 Circuit Breaker, Grey Label *USED*

Square D KA36125 Circuit Breaker, Grey Label *USED*

Square D KA36175 Circuit Breaker, Grey Label *USED*

Square D KA362001021 Circuit Breaker, Grey Label *USED*

Square D FC34100 Circuit Breaker *USED*

Square D KC342251021 Circuit Breaker w/ Shunt Trip USED

Square D KC34225 Circuit Breaker *USED*

Square D FC34030 Circuit Breaker *USED*

Square D KC34175 I-Line Circuit Breaker *USED*

Square D KC34110 I-Line Circuit Breaker *USED*

Square D KAF361251143 Circuit Breaker *USED*

Bryant BRWH230 Tandem 2 Pole Circuit Breaker *USED*

Bryant BRSN220 Switch Neutral Circuit Breaker *USED*

Bryant BR230 Bolt On GFI Circuit Breaker *USED*

Bryant BR120 Bolt On GFI Circuit Breaker *USED*

Bryant BR115 Bolt On GFI Circuit Breaker *USED*

Bryant BR230 GFI Circuit Breaker *USED*

Bryant BR215 GFI Circuit Breaker *USED*

Bryant BR120 GFI Circuit Breaker *USED*

Bryant BR140 Circuit Breaker *USED*

Bryant BR130 Circuit Breaker *USED*

Bryant BR120 Circuit Breaker *USED*

Square D FAL24045 Circuit Breaker, Grey Label *USED

Square D FAL36040 Circuit Breaker, Grey Label *USED

Square D FAL34030 Circuit Breaker, Grey Label *USED

Square D FAL34025 Circuit Breaker, Grey Label *USED

Square D FAL34020 Circuit Breaker, Grey Label *USED

Square D FAL34015 Circuit Breaker, Grey Label *USED

Square D FA3600712M Circuit Breaker, Black Label *USED

Square D FAL360801017 Circuit Breaker, Grey Label *USED

Square D FAL341006471 Circuit Breaker, Grey Label *USED

Square D FAL360251212 Circuit Breaker, Grey Label *USED

Square D FAL360801143 Circuit Breaker, Grey Label *USED

Square D FAL341001212 Circuit Breaker, Grey Label *USED

Square D KAL36125DC1616 Circuit Breaker, Grey Label

Square D KAL36175DC1680 Circuit Breaker, Grey Label

Bryant BR350 Circuit Breaker *USED*

Bryant BR340 Circuit Breaker *USED*

Bryant BR330 Circuit Breaker *USED*

Bryant BR320 Circuit Breaker *USED*

Bryant BR315 Circuit Breaker *USED*

Bryant BR270 Circuit Breaker *USED*

Bryant BR260 Circuit Breaker *USED*

Bryant BR250 Circuit Breaker *USED*

Item title
Bryant BR230 Circuit Breaker *USED*

Bryant BR225 Circuit Breaker *USED*

Bryant BR220 Circuit Breaker *USED*

Bryant BR215 Circuit Breaker *USED*

Bryant BR115 GFI Circuit Breaker *USED*

Bryant BR3100 Circuit Breaker *USED*

Bryant BR370 Circuit Breaker *USED*

Bryant BR360 Circuit Breaker *USED*

Square D QOU230 Circuit Breaker *NEW TAKE OUT*

Square D QOU220 Circuit Breaker *NEW TAKE OUT*

Bryant BR115 Circuit Breaker *USED*

Joslyn 1261-49-R-TT Transient Voltage Surge Suppressor 

Ferraz Shawmut 67575 Terminal Block *NEW TAKE OUT*

Square D QOU240 Circuit Breaker *NEW TAKE OUT*

Siemens HNF361 30 Amp Non Fused Disconnect *USED*

ITE/Siemens F351 30 Amp Fused Disconnect *USED*

ITE F354 200 Amp Fused Disconnect *USED*

Cutler Hammer DH362FRK 60 Amp Fused Disconnect 

Temporary Job Site Electrical Service **USED**

Challenger HD321SN 30 Amp Fused Disconnect  

Square D QOM100 Circuit Breaker **USED**

Square D FA36080 Grey Face Circuit Breaker *USED*

FPE 500 KVA, 480x240, 3 Phase Transformer *USED*

Square D Q2M3225MT Circuit Breaker  

Square D LA36400 Circuit Breaker *NEW TAKE OUT*

Square D FH36030 Circuit Breaker *NEW TAKE OUT*

Square D FH36100 Circuit Breaker *NEW TAKE OUT*

Square D FH26015AB Circuit Breaker  

Square D FH26015BC Circuit Breaker  

Square D FH26015AC Circuit Breaker  

Square D FH26040AC Circuit Breaker  

Square D FH36060 Circuit Breaker  

Square D FH36025 Circuit Breaker  

Square D MAL266001390 Circuit Breaker *NEW TAKE OUT*

Square D MHL361000 Circuit Breaker *NEW TAKE OUT*

Square D MHL3612001288 Circuit Breaker *NEW TAKE OUT*

Square D MA26600AC Circuit Breaker *NEW TAKE OUT*

Square D MHL3612001288 Circuit Breaker *NEW*

Square D FA26020AC Circuit Breaker *NEW*

Square D EGB34070 Circuit Breaker *NEW TAKE OUT*

Square D QO3151021 Circuit Breaker  

*BOX OF 5* Square D QO215 Circuit Breaker  

Square D QO2100 Circuit Breaker  

Square D HOM2100 Circuit Breaker  

Square D HOM120AFI Circuit Breaker  

Square D HOM115AFI Circuit Breaker  

Square D QOB120 Circuit Breaker *NEW TAKE OUT*

Square D QOB115GFI Circuit Breaker  

Square D QOB130GFI Circuit Breaker  

Square D QOB120GFI Circuit Breaker *NEW TAKE OUT*

Square D QHB120 Circuit Breaker  

Square D QOXD150 Circuit Breaker  

Square D QOB120VH Circuit Breaker  

Square D QOB320VH Circuit Breaker  

Square D QOB3100VH Circuit Breaker 

Square D Q12100VH Circuit Breaker  

Square D QOB340VH Circuit Breaker  

Square D QOB215VH Circuit Breaker  

Square D QOXD120 Circuit Breaker  

Square D QOB2100VH Circuit Breaker