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(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(luò)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(lǐng)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(luò)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(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，幾種有影響的現(xiàn)場總線技術(shù)已在一些特定的應(yīng)用領(lǐng)域里顯示出各自的優(yōu)勢。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(shè)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(yīng)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(shè)備級分散I/O之間通信設(shè)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(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)、樓宇自動化、電氣傳動、傳感器和執(zhí)行器、可編程序控制器、低壓開關(guān)設(shè)備等一般自動化控制。

  PROFIBUS-PA專為過程自動化設(shè)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(shè)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(shè)備，亦即遠程I/O。PROFIBUS-DP還用到了應(yīng)用層接口（ALI），ALI將過程對象轉(zhuǎn)換為通信對象。

Allen Bradley SLC500-10 Slot Rack w/Proc 1747-L542/C &

Norgren Smart Pumps / Vacuum System - VMS 2110 24 V

Fanuc AC Servo Motor A06B-0127-B175

Allen-Bradley 1794-OB16P Flex I/O Output Module

Olsun 45 KVA 480 HV / Dry type Class AA Transformer
415Y/240-120 LV / 3 Phase

Goodyear FHP 4L280 Power Transmission Belt

Fanuc AC Servo Motor A06B-0153-B675

PILZ Pnoz 11 Safety Relay - Emergency Stop Relay

FANUC A16B-1212-0871/?12C POWER SUPPLY

Allen Bradley 1785-L40B/D Controller w/NP5 Kit

Allen-Bradley 1794-ADN Flex I/O DeviceNet Adapter

Allen Bradley AB 104-B110NZ243 Series A Contactor
Reversing Starter

ALLEN BRADLEY 500-DOD920 New In Box / 115-120 V

Honeywell Temperature Controller L456A 1008 NIB
2-Wire 250V Max - 5 Ft copper capiliary 

NIB Honeywell Serviceline Pneumatic Thermostat 
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Allen-Bradley 1794-IB10x086 Flex I/O Combo Module

Allen-Bradley 1794-IB16 Flex I/O Input Module w/TB3Base

Reliance Electric Variable Speed Drive - 125 HP 
pulled from operating Machining center

Fanuc A16B-2201-0891/?03A Ethernet Remote PCB 

Fanuc A05B-2316-C105 3 Slot Back Plane

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FANUC A16B-3200-0040/?04C MAIN CPU PCB MODULE

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BOARD

B74 GATES HI-POWER II VBELT

GATES Part # 3740 Truflex Belt 21/32"x 74" 17x1880mm

FANUC Servo Amplifier Unit A06B-6089-H105

GATES Part # 3740 {Truflex Belt 5L 21/32" x 74"}

CONTROL TECHNIQUES 9500-8603 QUANTUM III DC DRIVE 
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Moog Brushless Sevro Motor / Model 306-131A - NEW

Allen Bradley PowerFlex 70 AC Drive2HP 20AD3P4A3AYNNNN?N

NIB Honeywell Heavy duty Heating/Cooling Thermostat
T6051A 1016

Square D Reversing Starter 8702 Type SDO-2 -New In Box

Square D 1S1FIS 1 KVA General Purpose Transformer Used

Allen Bradley AB 104-A75NZ243 Series A Contactor
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Honeywell Ultraviolet Flame Amplifier - 7800 Series NIB
R7849 A 1023 - Solid State plug in amplifier

Allen Bradley AB 104-B180ND3 Series A Contactor
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NIB Honeywell Sailswitch - 43A 1003 1 (2wire / 250Vmax)

Allen Bradley 1747-L511/B SLC 5/01 CPU 1747L511 / B

Allen Bradley 1756-DHRIO/B Logix DH+/RIO Communication

Allen Bradley 1747-L541/B SLC 500 5/04 1747L541

Allen Bradley 1747-L542/B SLC 5/04 CPU 1747L542 / B

Reliance 0-51874 Module Static Seq SCCA

Reliance 0-48652 PC Board Meter Calibration

Reliance 0-48652-25 PC Board

Reliance 0-48654 PC Board- AC Tach Rectifier

Reliance 0-49017-83 Card Pack

Reliance 0-51375 PC Board

Reliance 0-51418-4 PC Board

Reliance 0-51419 PC Board Gate Coupling

Reliance 0-51421-3 RC Network

Reliance 0-51425-1 Rectifier - AC Tach

Reliance 0-51426 PC Board- Field Loss

Reliance 0-51444 Driver Board

Reliance 0-51445 Controller Board

Reliance 0-51446 PC Board

Reliance 0-51447-3A PC Board - PC Network- 460V

Reliance 0-51486-24 PC Board

Reliance 0-51486-39 PC Board

Reliance 0-51486-56 PC Board ETR - 14 Pin

Reliance 0-51811-1 Tester Card- Voltmeter- TSTB

Reliance 0-51829-2 PC Board Linear Voltage- LVTC

Reliance 0-51831 PC Board Current Voltage CVTB

Reliance 0-51831-1 PC Board Current Voltage CVTB

Reliance 0-51831-3 PC Board Current Voltage CVTD

Reliance 0-51839-4 PC Board Relay Card IRCE

Reliance 0-51845-1 PC Board Power Supply PRSB

Reliance 0-51846-25A PC Board

Reliance 0-51847 Voltage Detector Board VLDB

Reliance 0-51848-1 PC Board

Reliance 0-51849 PC Board Gate Driver GBCA

Reliance 0-51851-5 PC Board Control Regulator

Reliance 0-51851-6 PC Board Control Regulator- CRCG

Reliance 0-51862-1 PC Board Universal Sum AMP

Reliance 0-51865 (CLDA) PC Board- Current Loop Drive

Reliance 0-51865-1 (CLDB) PC Board- Current Loop Drive

Reliance 0-51865-9 Module Current Loop DRV-CLDK

Reliance 0-51874-2 PC Board Static Sequence SSCC

Reliance 0-51881-1 Circuit Card Ext Term CNTR- ETCB

Reliance 0-51884 LSCA Moldule LOG SIG COND

Reliance 0-51890-6 PC Board DPSG

Reliance 0-51893-2 Field Controller - FCCC

Reliance 0-51893-3 PC Board- Field Exciter FCCD

Reliance 0-51899-2 Control Module Extender Card

Reliance 0-51901-A Armature Reg.

Reliance 0-51902 Driver Card

Reliance 0-51902-5 PC Board

Reliance 0-51903-A Power Supply

Reliance 0-52012 PC Board Gate Driver MaxPak

Reliance 0-52014 PC Board Timed Voltage Reference

Reliance 0-52824 Current Loop Regulator

Reliance 0-54349-2 PC Board Phase