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　　工业循环水轧钢工业中占有非常重要位，其水温高低直接影响到加热炉和轧机等设备安全和使用寿命。为及时准确对循环水进行监控，莱钢轧钢厂中小型车间水处理采用浙大中控SUPCON JX—300X DCS控制系统。DCS控制系统把计算机、仪表和电控技术融合一起，实现了数据自动采集、处理、工艺画面显示、参数超限报警、设备故障报警和报表打印等功能。并此基础上开发了针对循环水温温度闭环控制。
　　2、系统介绍
　　SUPCON JX—300XDCS采用高速工业以太网Scnet作为其过程控制网络，系统由工程师站、操作站、控制站、过程控制单元等组成，配置灵活。水处理系统规模，水处理SUPCON DCS系统设计了1个控制站，1个操作站设置安全级别可兼做工程师站)，构成两级结构。控制站是现场级，直接与现场设备交换数据，完成整个工业过程实时监控功能。操作站(兼工程师站)是监督控制级，即可完成对系统组态、又可实现对现场级检测、控制、保护功能管理。SUPCON JX—300X DCS系统SCKey组态软件是一个全面支持该系统各类控制方案组态软件平台。 SCKey组态软件可完成整个系统控制站组态(系统I/O组态、控制方案组态等)、操作站组态(画面设置、系统流程图组态、系统报表组态等)。系统构成如图1所示。
　　3.1 方案设计
　　从生产热线循环回来工业水流入1#、2#吸水井散热，并吸水井塔顶1#和2#风机进行降温，然后1#、2#吸水井底部共用一个出水管为下一个工序供水，水温要求控制30oC以下。本系统吸水井出水管处安装Cu50热电阻对水温检测，把温度信号T1送入DCS处理器，控制规律运算后给出控制信号，控制变频器来改变电机输入电压频率，来改变电动机转速，带动风机降温，构成一个闭环温度控制系统。变频器选用两台日本SANKEN(300KW)通用型变频器，控制原理如图2所示。
　　循环水吸水井底部热交换特点，对1#、2#吸水井两台风机电机进行主/副控制，主/副电机不同速度曲线驱动风机运转。1#、2#电机可互为主/副电机选择，极大方便了操作工操作。
　　3.2 软件实现
　　为方便操作人员操作，操作站创建循环水温度监控画面，可线显示循环水温度、变频器速度反馈、报警等，进行1#、2#风机电机启停控制和主/副选择控制。并切换安全等级线修改主/副电机控制回路中温度、转速等控制参数。
　　针对循环水温度调节存大滞后性特点，对1#、2#风机电机采用分段控制方法，主/副电机控制曲线如图3所示：当循环水温度低于20oC时，主/副风机电机变频器输出电压频率均为20HZ。当循环水温度变高时，主控制回路中变频器输出电压频率跟随增大，当循环水温度高于24oC时，主电机全工频运转。副电机循环水温度升至23oC时，副控制回路增大副电机输入电压频率，提高风机转速，当循环水温度高于28oC时，副电机全工频运转，与主电机一起为循环水快速降温。

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Siemens 6ES5 421-8MA12 Digital Input Module NIB

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Reliance Electric 61C351A Analog I/O

INTERNATIONAL DATA SCIENCES MODEL 76B INTERFACE MODULE

TEXAS INSTRUMENTS 510-7105 VPU INTERFACE MODULE PART NO. 2702403-0001

WS-C6509-E CATALYST ENHANCED 6509 CHASSIS 9 15RU

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Reliance 57C411

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Schneider Modicon AS-B359-001 USPP ASB359001

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Schneider Modicon AS-B810-008 16 ISOLATED OUTPUT MODULE 115V 48095

Modicon AS-B838-032 Discrete Output Module

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Total Control Products QPJ-DVN-202 Communication Module Series A 24VDC

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SIEMENS Simodrive 610 Instruction Manual Edition 08.91_6SC6101-0AA76_1987_PWM

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ADVANTECH PCL-747+ CPU Module

Allen-Bradley 1756-OB32 DC Output Module

ABB Bailey Infi 90 IMMFP01 Multi-Function Processor in the Factory

Adept T1 Pendant P68700-00550

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HONEYWELL 51402755-100 USPP 51402755100

TAYLOR ELECTRONICS 6205BZ10000K USPP 6205BZ10000K

DANFOSS 175H4447 USPP 175H4447

CONTROL TECHNIQUES FX-208 USPP FX208

OMRON NT600M-DT122 NSFP NT600MDT122

MODICON 557-VCM-761-10 NSFP 557VCM76110

GENERAL ELECTRIC DS3820HSMC1C1F USPP DS3820HSMC1C1F

Siemens 6ES5 304-3UB11 6ES53043UB11

Siemens 6ES5-521-8MA22T NSFP 6ES55218MA22T

SIEMENS 6ES5-318-8MA12/6ES5318-8MA12 INTERFACE NIB

Siemens 6ES5 095-8MC01 6ES50958MC01

Siemens 6ES5138-4HA00-0AB0 6ES5 138-4HA00-0AB0

Siemens 6GK5 788-1ST00-2AA6 6GK57881ST002AA6 Ethernet

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Kingspec Flash DOM Disk On Module 1GB/1G 44Pin Vertical IDE Interface PATA MLC

YASKAWA ELECTRIC JAMSC-B2801 USPP JAMSCB2801

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Siemens OP270 6AV6 542-0CC10-0AX0 HMI Touchscreen in Box

Red Lion bmk20000

Schneider Modicon AS-B827-032 ASB827032 32 Point 24VDC Input NIB

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Modicon/Schneider PanelMate PM+ 1000 Modbus MMPMMP003C

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Telemecanique MODICON TWDLCAA16DRF NIB

Siemens Simatic S5 6ES5-470-7LB11 Analog Output Module

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SIEMENS Sinumerik DM 16 E-MODUL 6FC5111-0CA01-0AA0

SIEMENS 6SN1112-1AC01-0AA0 MODULE 6SN11121AC010AA0

SIEMENS SIMODRIVE 6SN1130-1A011-0BA0

SIEMENS OP010S 6FC5203-0AF04-0AA0 Membrane Keypad

Advantech PCL-746+ Card

ALLEN-BRADLEY 2711-M3A18L1 PanelView 300 Micro WOW

ABB 57288531 MEM 86-192K Memory Allen Bradley Stromberg 200039

Acme T-1-53347-3S 225 KVA 480 to 240/120V 3PH Transformer N1 Reconditioned

Aaronia EMI HyperLog 20300 Antenna -

8500-E153 ALLEN BRADLEY PLC MODULES

SIEMENS 6FX1-132-8BB01 USPP 6FX11328BB01

ASEA BROWN BOVERI PM665 NSFP PM665

ASEA BROWN BOVERI 57120001-FG USPP 57120001FG

MITSUBISHI FRZ220-22.0K USPP FRZ220220K

INDRAMAT IKG0122-25 NSPP IKG012225

ALLEN BRADLEY 8000-KAC NSPP 8000KAC

STOBER C202N0560MR163/050 USPP C202N0560MR16305

Siemens 6ES5-432-3BA12 USPP 6ES54323BA12

SIEMENS 6ES5 465-3AA13 6ES54653AA13

SIEMENS 6ES7 400-1JA00-0AA0 6ES74001JA000AA0

Siemens S5 6ES5 375-8LC21 MEMORY MODULE

Siemens 6ES7 414-2XK05-0AB0 6ES74142XK050AB0 NIB

Siemens RLU222 Controller

Promise Removable Device PR401US Pegasus R4 4TB RAID System 4x1TB SATA

HomeSeer ADIO-100 Analog / Digital System Interface

Veeder-Root TLS-350 330886-001 Type A Interface Module

SIEMENS 6AV6644-0AA01-2AX0 MP377 12" Touchscreen Glass

SIEMENS LOGO 6ED1055-1FB00-0BA0 Exsion Module

Omron 3G2A5-DUM01

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Schneider Modicon AS-P371-002 QT1 CPU PROGRAM MODULE

Schneider Modicon AS-E909-131 ASE908131

Schneider Modicon Gould PC-0984-385 AS-M380-006 - AS-E385-904

Schneider Modicon AS-BDAO-216

Schneider Modicon PROCESSOR MEMORY MODULE AS-M380-006

Telemecanique Altistart 48 ATS48C41Y

Schneider Telemecanique BMXP342020

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SIEMENS Sinumerik 6EV3 055-0DC 810T Power Supply

GE FANUC IC600CB53GL COMMUNICATIONS CONTROL MODULE TYPE2 SERIES SIX

SIEMENS SIMODRIVE 6SN1145-1BA02-0CA1SINUMETIK 840D NCU 6FC52476SN11236FC5357

SIEMENS SINUMERIK 6FC3538-3EF 6FC35383EF USED

SIEMENS Moore Industries FDT/C/4-20MA/117AC FREQ TO DC TRANSMIT

Allen-Bradley InView Message Display 2706-P22R

AB Allen Bradley 4100-234-R Series K IMC S Class 4 Axis Motion Controller Servo

AC Motor Control Drive - 30 HP - 600 Volt - Three Phase Input

A06B-0502-B751 FANUC SERVO MOTORS REMANUFACTURED

75 KVA 480 DELTA TO 240 D/120 3 PHASE TRANSFORMER

RELIANCE ELECTRIC 86466-59SCR NSFP 8646659S

ALLEN BRADLEY 4100-234 USPP 4100234

ALLEN BRADLEY 1784-T50B USPP 1784T50B

INDRAMAT CLM-01.3-X-E-4-0-FW USPP CLM013XE40FW

YAMATAKE 82114927-002 NSPP 82114927002

UNITED TECHNOLOGIES TV612012S USPP TV612012S

HONEYWELL 30731720-001 USPP 30731720001

Siemens 6ES5-242-1AA32/6ES5242-1AA32 SIMATIC COUNTER MODULE XLNT

SIEMENS 6ES5 375-8LA12 6ES53758LA12

SIEMENS Digital Output Module 6ES5 440-8MA22 Appears to be

Siemens 6ES5 998-1DB21 NSPP 6ES59981DB21

SIEMENS 6ES5470-8MA12 6ES54708MA12

Siemens MP277-10 6AV6 643-0DD01-1AX1 Touch Glass

RELIANCE ELECTRIC 0-57405-E USPP 057405E

Texas Instruments 500-5055

Square D NEHB442ASP-N Power Interface Module Make An Offer

Unisphere Juniper CT1-Full CT1_I/O ERX 1400 90 Free Overnight Ship

Siemens Card 6ES7793-2AA00-0AA0 6ES7 793-2AA00-0AA0

Modicon AS-W904-015

Schneider Modicon 38489 In box AS-BDAU-202 Output Module 10V

Schneider Modicon PC-A984-120 with3 DEP 216/AS-BDEP-216 ON DTA 200 RACK 30DAY WARRANTY

Schneider Modicon AS-BDAP-258 USPP ASBDAP258

Schneider Modicon AS-BADU-206

Schneider Modicon /Schneider AS-B872-100/ASB872100 Analog Output NICE OFFERS ACCEPTED

Schneider Modicon COMM. PROCESSOR MODULE AS-C921-000

Schneider Modicon TSXP575634M in Box

SCHNEIDER TSX MICRO TSXDEZ08A4 DISCRETE INPUT MODULE

Rare MARANTZ 750A 6 MonoBlocks INDEPENDENT 3 Way SYSTEM

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SIEMENS SINUMERIK OP010 6FC5203-0AF00-0AA0 MembraKeypad

Mitsubishi MELSEC A1S-D51S A1SD51S Communication Module PLC Programmable

SIEMENS Simodrive 6SN1118-0AE11-0AA0 Module

SIEMENS Sinumerik FPCI/ISA 6FC5247-0AA02-1AA0 6FC5 247

SIEMENS 6FC5203-0AB00-0AA0 Sinumerik OP030 Free Ship

ALLENBRADLEY1734-OB4EOUTPUTMODULE

Allen Bradley SLC 500 1747-L40A Processor Output Module Good Condition

ABB ROBOT SERVO 3HAC0468-1

A06B-0143-B175 FANUC SERVO MOTORS REMANUFACTURED

0021-21589 CLAMP RING, 8" SNNF, PADDED, MASKS HTHU

MODICON PC-E984-385 NSFP PCE984385

ALLEN BRADLEY 150B360NBDD USPP 150B360NBDD

ALLEN BRADLEY 1326AB-C2C-21-4888A USPP 1326ABC2C214888A

GENERAL ELECTRIC 331X232ACG03 USPP 331X232ACG03

SQUARE D HDMPM21012188 NSFP HDMPM21012188

SIEMENS 6SC9811-2BE30 USPP 6SC98112BE30

ASEA BROWN BOVERI 68789010P FNFP 68789010P

Siemens 6ES5 943-7UB11 6ES5943-7UB11 Free Ship

Siemens Simatic S5 6ES5 460-4UA13 Module 6ES5-460-4UA13

SIEMENS 6ES5-700-2LA12 NSPP 6ES57002LA12

Siemens 6ES5 456-4UA12SERIES DIGITAL OUTPUT MODULE 16POINT 55025

SIEMENS 64kB MMC 6ES7953-8LF20-0AA0

Siemens HMI PP7 6AV3688-3AA03-0AX0 Operator panel

SANS DIGITAL MR4UT MobileRaid 4-bay hardware RAID

Square D FAL34025

SIEMENS HTRI-D INTEL INTERFACE DUAL MODULE

SERIES E CAT REV K01 F/W REV D.1

Siemens 6SE7018-0EA84-1HF3

Siemens TP7 6AV3607-1NH01-0AX0 Touch Glasss

Schneider Modicon DEP210/AS-BDEP-210 INPUT MODULE NIB

Schneider Modicon ASB885002 GOULD MODULE AS-B885-002

Schneider Modicon AS-B837-016 USPP ASB837016

Schneider Modicon SEALED AS-B829-116 MODULE

Schneider Modicon B804 AS-B804-016 115V 16PT INPUT MOD ASSEMBLY

Schneider Modicon AS-H819-209 Housing Assembly 800 rack plc 19"

Schneider PLC Analog Output Module 170AAO12000

Siemens 6ES5430-4UA12 Simatic Input Module 20280

Roland Fantom XR SRX-05 upgraded 128-Voice Synthesizer / Sampler Module-MIDI 2

SIEMENS CONTROL MONITOR M IPC3510A300MGT TOUCH SCREEN

SIEMENS SINUMERIK 840DE 6FC5356-0BB14-0AA0 NCU 561.4

RELIANCE ELECTRIC NETWORK COMMUNICATION PLC MODULE 57404-1 57-404-1 57404-1F

SIEMENS CONTROLLER CARD 6SN1118-0AD11-0AA0 ~

SIEMENS SIMODRIVE SERVO DRIVE 6SN1145-1AA01-0AA2

SIEMENS 6FC5110-0CB01-0AA0 6FC51140CB010AA0 version E

ALLENBRADLEY2711P-T9C1OPERATORINTERFACEPANELVIEW900SERIESCREVC

Allen Bradley Versaview 1500P 6181P-15TPXPHSS Rev A Ser C For Windows XP AB/COA

ABB FI803F 3BDH000032R1 good in condition for industry use

Advanced Energy ATX-600 Impedance Matching Network -

(M3) 1 BAYSIDE ( Parker) RA142-010-LB GEAR HEAD MOTOR M3

MARPOSS 3014332600 USPP 3014332600

ALLEN BRADLEY 1334-FOB-T4 USPP 1334FOBT4

GE FANUC IC3600LSRB1 NSPP IC3600LSRB1

FANUC A06B-6058-H221 USPP A06B6058H221

SIEMENS 1LA0364-2SP22 NSFP 1LA03642SP22

RELIANCE ELECTRIC 0-60002-5A USPP 0600025A

SIEMENS 6DS1302-8AB USPP 6DS13028AB

Siemens 6ES5 466-4UA11

Siemens 6ES5-944-7UA12 USPP 6ES59447UA12

SIEMENS 6ES5-435-7LA11 NSFP 6ES54357LA11

Siemens 6ES5 700-8MA11 Bus Module w/Warranty

Siemens S5 6ES5 927-3SA11 6ES59273SA11

Siemens C79451-A3276-A1

SIEMENS 6ES5-305-7LB11 NSPP 6ES53057LB11

Square D 8020 SCP-321

NUM Interface Module 32 E _ 263202926 _ 2632O2926

WS-C3750G-48TS-S CISCO 3750G-48TS SWICTH W/1 YR -WSC3750G48TSS

Siemens 6ES7232-0HB20-0XA0 6ES72320HB200XA0 FreeShip

SIEMENS SIMATIC PANEL PC870 6AU7705-3CA40-0AA0 Membrane Keypad

Reliance 61C22A

Schneider Modicon ASWBXT201 Compact Primary Rack AS-WBXT-201

Schneider Modicon AS-B374-001 NSFP ASB374001

Schneider Modicon AS-T584-002 USPP AST584002

Schneider Modicon AS-BDAP-210 OUTPUT MODULE 8 POINT 24-230VAC

Schneider Modicon AS-B824-000 I/O MODULE / 24 vdc output

MODICON AS-B355-001 OUTPUT MODULE OLD STOCK FREE SAME DAY SHIPPING USA

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Siemens 505-4232 Input Module 5054232

SIEMENS OUTPUT MODULE 2AMP 24VDC 1P 6ES7 132-4BB30-0AA0

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ALLEN-BRADLEY 1746-OVP16 SLC 500 OUTPUT MODULE SERIES C 20.4-26.4 VDC