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。

 TESTED SURPLUS GE FANUC VERSAMAX MICRO CONTROLLER IC200UDR001-BB
       IC610PER151D GE FANUC PRINTER INTERFACE MODULE SNAP-ON CC
       GENIUS I/O 115V 50/60HZ .1A MAX GE FANUC BLOCK/BRICK IC66OELA100A (II3)
       GE Fanuc VersaMax micro controller IC200UDD112-BC -60 day warranty
       GE Fanuc servo motor power cable IC800SKCPV050B - 60 day warranty
       GE FANUC SERVO MOTOR A06B-0614-B032
       GE Fanuc Series 90 Micro Programmable Controller IC693UDR005FP1 In: 24VDC
       GE Fanuc PLC Series 90 Micro, IC693UDR001NP1
       GE Fanuc PLC Output Module, IC693MDL340E, 120VAC, .5A, 16PT
       GE Fanuc PLC Analog bbbbb Card, IC693ALG220G, 4PT Voltage
       GE Fanuc PLC Analog bbbbb Card, IC693ALG220D, 4PT Voltage
       GE Fanuc IC697CHS782B Series 90-70 17 Slot Rear Mount Rack
       GE Fanuc IC693UDR002BP1 Series 90 Micro Programmable Controller
       GE Fanuc IC693PWR321CA Power Supply 120/240VAC 30W
       GE Fanuc IC693CPU331Y CPU 331 Module
       GE Fanuc IC693CPU331S CPU 331 Module
       GE Fanuc IC693CPU331N CPU Module 90-30
       GE Fanuc IC693CPU323J Base 10 Slot Rack with CPU
       GE Fanuc IC693CPU323E Base 10 Slot Rack with CPU
       GE Fanuc IC693CPU323D Base 10 Slot Rack with CPU
       GE Fanuc IC693CPU323C Base 10 Slot Rack with CPU
       GE Fanuc IC693ALG390D 2PT Analog Output Module
       GE Fanuc IC693ALG221C bbbbb Analog 4PT Current
       GE Fanuc IC693ALG220D 4PT Analog bbbbb Module
       GE FANUC IC660EBD101S GENIUS I/O MODULE, IC660TSD100L TERMINAL
       GE FANUC IC660EBD101 BLOCK
       GE Fanuc IC630MDL311A 24VAC/DC SRCE bbbbb Module 16 Circuits
       GE Fanuc D-A7610-4 Board
       GE Fanuc A20B-0007-0070-06B Circuit Board
       GE FANUC A16B-1212-0222/02A I/O C5
       GE Fanuc A14B-0076-B001 bbbbb Unit
       GE Fanuc 230VAC Output Module A03B-0819-C158
       GE FANUC 10 SLOT BASE EMI ENHANCED IC693CHS391M
       FANUC TEACH PENDANT CABLE A660-2004-T284 L=11MEB / YF91-F MR-20LW (B27)
       Fanuc Robotics EE-1063-001 Accuflow Counter bbbbb Module
       Fanuc Operator Interface Board A20B-1006-0291/02B A20B1006029102B
       Fanuc Keypad PCB A20B-1001-0510/02A A35O-IOOI-T5I2/O2 A350-1001-T512/02
       FANUC CRT/KB UNIT A05B-2051 - C102
       Fanuc AID32F1 bbbbb Module A03B-0807-C106
       Fanuc A20B-1007-0540/01A Relay Board
       Fanuc A20B-1006-0290/02B Operator Panel Relay Board
       Fanuc A20B-1005-0120/03A Power Supply Board
       Fanuc A20B-1004-0590/02B Slot Rack Control Chassis
       Fanuc A20B-1002-0490/02A Video Signal Board
       Fanuc A20B-1000-0472/03A Power Supply Board
       FANUC A16B-2203-0830/03A CIRCUIT BOARD CHEAP (C47)
       Fanuc A16B-2200-0917/04A Option Board without Daughter Boards
       FANUC A16B-2200-0020/05C BASE 2 FANUC A16B-2200-002 BOARD
       FANUC A16B-1700-0130 PC BOARD A16B-1700-0130 A16B-1700-0130/02B
       Fanuc A16B-1310-0600/02A Purge Control Board
       Fanuc A16B-1310-0530/17D Power bbbbb Board
       Fanuc A16B-1212-0030/02B Detector Adapter Board
       Fanuc A16B-1211-0120/05B CPU Board
       Fanuc A16B-1211-0120/04B CPU Board
       Fanuc A14B-0076-B001-01 Servo Amplifier bbbbb Unit
       Fanuc A14B-0061-B103 bbbbb Module RC Power Unit
       Fanuc A05B-2452-D350 Connector Assembly
       Fanuc A05B-2400-C060 2 Slot Backplane Module
       Fanuc A05B-2300-C002 4 Slot Backplane Rack
       Fanuc A05B-2051-C041 RH Battery Unit
       Fanuc A02B-0236-C203 Detector Interface Module SDU1
       Fanuc A02B-0047-C062 Tape Reader Unit
       Fanuc 15-TA Base Module A02B-0094-B502
Union/Fanuc Power Transbbbber, # A80L-0001-0339, 1800 VA, **        ** WARRANTY **
TSUGAMI NP-32 CNC FANUC SERVO AMPLIFIER DRIVE A06B-6058-H003 BOARD A20B-1003-003
TSUGAMI NP-32 CNC FANUC SERIES O OO MAINTENANCE MANUAL BOOK B-60125E/02
TSUGAMI NP-32 CNC FANUC AC SPINDLE SERVO UNIT MAINTENANCE MANUAL B-65015E/01
TSUGAMI NP-32 CNC FANUC AC SERVO UNIT MAINTENANCE MANUAL GUIDE B-54765E/02
TSUGAMI NP-32 CNC FANUC AC SERVO UNIT DIGITAL MAINTENANCE MANUAL B-65005E/05
TSUGAMI NP-32 CNC FANUC A20B-1001-0731 EXPANSION MODULE BOARD A350-1001-T736
TOYODA GT-32 CNC LATHE FANUC A03B-0801-C123 ID64C bbbbb MODULE A03B0801C123
TOYODA FH-45 CNC MILL FANUC A14B-0076-B106 bbbbb UNIT A16B-1600-0080 BOARD
TOSHIBA FANUC A50L-1-0230 IGBT TRANSISTOR
TOSHIBA FANUC 100A IGBT TRANSISTOR A50L-1-0212 *LOTS OF 3*
TESTED        SURPLUS FANUC IC693ALG390 GE
TESTED        GE FANUC PLC IC693UDR001RP1 IN 24VDC
TESTED        GE FANUC PLC IC693UDR001LP1 IN 24VDC
TESTED        GE FANUC PLC IC693UDR001CP1 IN 24VDC
TECNO WASINO LG-6 FANUC NTJ0511A CONTROL PANEL A860-0201-T001 PULSE GENERATOR
TAMAGAWA SEIKI A86L-0027-0001 TS1508N92 OPTICAL SHAFT ENCODER FANUC TAPE DRILL
TAMAGAWA FANUC A90L-0001-0197 5715 READER MOTOR LT 2
TAKISAWA MAC-V3 CNC MACHINE FANUC SYSTEM 6M CONTROL OPERATOR PANEL KEYBOARD
TAKISAWA MAC V2 CNC MILL W/ FANUC 6M ELECTRONIC DIAGRAM
TAKAbbbbI TNC-LO LATHE FANUC SERIES O-MATE T 0-MATE CONTROL PANEL A02B-0091-C041
TAKAbbbbI TNC-LO LATHE CONTROL PANEL & FANUC PULSE GENERATOR A860-0201-T001
SW1857C Fanuc High Quality Ceramic Module (1 PER)
STAR RNC-16 CNC LATHE FANUC OPTION A13B-0139-C360 OPERATOR CONTROL PANEL
STAR MAF-42 CNC FANUC BOARD A16B-1211-0280 /03A A16B12110280 A320-1211-T286/02
STAR MAF CNC MACHINE FANUC bbbbbbbbING MODULE PT01A A03B-0801-C051 A03B0801C051
STAR MAF CNC FANUC VELOCITY CONTROL DRIVE UNIT A06B-6050-H102 A20B-1000-0560
STAR KNC -16/20 CNC LATHE FANUC A13B-0129-C038 TERMINAL UNIT A13B0129C038
SPINDLE RPM CONTROL PANEL FANUC CABINET
SPINDLE MOTOR FANUC AC TERMINAL BOX COVER A290-1003-X431 CNC
Soshin EMI Filter off of Fanuc Robocut Wire EDM, Mod # LF3020D-Y1,       
Soshin EMI Filter off of Fanuc Robocut Wire EDM, Mod # LF3005A-Y1,       
SORENSEN PTM28-6.0 POWER SUPPLY 6A 29V PTM2860 FANUC MISC PALLET 26
Siemens TI 305-05N , DirectLogic D3-16ND2-1 , Koyo E-05N or GE Fanuc IC610MDL107
Siemens Sinumerik Fanuc Pulse Generator A860-0201-T002
Shinano / Fanuc Tape Reader Motor A90L-0001-0068,       , WARRANTY
SET OF (2) Makino Fanuc System 11M Model A Instruction Manual _ SE85-008/E
Schwei?robotersteuerung Fanuc Operator Panel
SANYO REMEX FANUC CONTROL READER RLC174-1B, RLC172-4, RLC170-5
Sanyo / Fanuc Control Reader Board, RLC172-4, RLC174-2, RLC170-5,       
Sanyo / Fanuc Control Reader Board, RLC172-4, RLC170-5,       , WARRANTY
RX-740, GE FANUC IC693ACC336A AUXILIARY TERMINAL BOARD W/ IC693CBL324A CABLE
ROKU-ROKU VERTIMAC-O CNC FANUC PERMANENT MAGNET MOTOR 5N-2000M & A860-0300-T001
RIBON CABLES 2040-T107 LOT OF 4 LONG FANUC ROBOT LR MATE 2001
REPLACEMENT PULLEY FOR FADAL CNC MODEL PUL-0114 PULLEY MOTOR FANUC (I,01-02)
REPAIRED FANUC A05B-2351-C201 BRAKE RELEASE UNIT MISSING COVER A05B2351C201
RENISHAW A-4012-0584 FANUC-B CONTACT TOOL SETTING SOFTWARE *     *
REM GE Fanuc IC600CB504A Internal Memory Card, WARRANTY
RELAY PANEL A04B-0018-C204 A04B0018C204 FUJITSU FANUC CNC VERT MILL
RECONDITIONED FANUC DAUGHTER BOARD (A20B-2902-0070//04)
RECONDITIONED FANUC BACK PLANE BOARD A20B-2001-0980/01A
RECONDITIONED FANUC BACK PANEL ( A20B-2100-0220 )
Reactor Transbbbber 75A 3PH Fanuc CNC
Quantity 3 GE FANUC 90-70 IC697ACC702A IC697ACC702 TERM.
QTY 2-Fanuc Power bbbbb Cable 4005-T215 #L4R203 Y-13X018034 - AWM 2464 VW-1
PRATT WHITNEY WIRE EDM W1 FANUC A20B-1004-0340 A350-1004-T342 CNC BOARD
PRATT WHITNEY WIRE EDM FANUC A04B-0215-C215 A80L-0001-0495 A04B-0215-C215-01
PRATT WHITNEY EDM W1 FANUC RESISTOR UNIT A04B-0220-C412 IWAKI NCRH80V NCRH200V
PRATT WHITNEY EDM W1 FANUC A20B-1003-0940 A350-1003-T932 A04B-0222-C409
PORTER PEERLESS 183-12-0106-0 DC SERVO MOTOR
PLC Ge Fanuc Base espansione 10 slot IC693CHS392F
PLC Ge Fanuc Base 10 slot Typ IC693CHS391
PLC GE FANUC 90 30 IC693PWR325 24/48 Vcc
PLC GE FANUC 90 30 IC693PWR322 24 Vcc
PLC GE FANUC 90 30 IC693MDR390
PLC GE FANUC 90 30 IC693MDL753
PLC GE FANUC 90 30 IC693MDL390 Output
PLC GE FANUC 90 30 IC693CMM302
PLC GE FANUC 90 30 IC693ALG442B
PLC GE FANUC 90 30 IC693ALG390
PLC GE FANUC 90 30 HE693ASC900
PLC GE FANUC 90 30 Centro programmazione e riparazione
PCB Circuit Board, A20B-2100-0220/03A
Original Fanuc 6T-Model "C" Maintenance Manual B-5320