描述

350042M

從時(shí)間調(diào)度上來說。
PLC的程序一般不能按事先設(shè)定的循環(huán)周期運(yùn)行。PLC程序是從頭到尾執(zhí)行一次后又從頭開始執(zhí)行。（現(xiàn)在一些新型PLC有所改進(jìn)，不過對(duì)任務(wù)周期的數(shù)量還是有限制）而DCS可以設(shè)定任務(wù)周期。比如，快速任務(wù)等。同樣是傳感器的采樣，壓力傳感器的變化時(shí)間很短，我們可以用200ms的任務(wù)周期采樣，而溫度傳感器的滯后時(shí)間很大，我們可以用2s的任務(wù)周期采樣。這樣，DCS可以合理的調(diào)度控制器的資源。

從網(wǎng)絡(luò)結(jié)構(gòu)發(fā)面來說。
一般來講，DCS慣常使用兩層網(wǎng)絡(luò)結(jié)構(gòu)，一層為過程級(jí)網(wǎng)絡(luò)，大部分DCS使用自己的總線協(xié)議，比如西門子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等，這些協(xié)議均建立在標(biāo)準(zhǔn)串口傳輸協(xié)議RS232或RS485協(xié)議的基礎(chǔ)上?，F(xiàn)場IO模塊，特別是模擬量的采樣數(shù)據(jù)（機(jī)器代碼，213/掃描周期）十分龐大，同時(shí)現(xiàn)場干擾因素較多，因此應(yīng)該采用數(shù)據(jù)吞吐量大、抗干擾能力強(qiáng)的網(wǎng)絡(luò)標(biāo)準(zhǔn)?；赗S485串口異步通訊方式的總線結(jié)構(gòu)，符合現(xiàn)場通訊的要求。

WESTINGHOUSE RD316T36W 1600A LSIG CIRCUIT BREAKER

GE ELECTRIC 225-100-56-25HP 1790-1190-895-5?95RPM MOTOR

MATRA 225 KVA 2400V DRY TYPE N3R TRANSFORMER 23211-1

SQUARE-D PXF361600 LSI ELECTRONIC TRIP CIRCUIT BREAKER

UNUSED GE 800A 600V AKRU-7D-30S POWER CIRCUIT BREAKER

MAGNUM DS 1600 AMP 3P CIRCUIT BREAKER W/ PROGRAMMER

DENISON 100HP 5000PSI HYDRAULIC POWER SUPPLY

2000A TRANSFER SWITCH 3 PH STATIC L3 COMMUNICATIONS

3 UNUSED S&C SM-5S NON-DISCONNECT 15KV FUSE ASSEMBLY

ZINSCO 300 KVA 480 240 VAC 223-411-5HM TRANSFORMER

WESTINGHOUSE SPB-100 1600A FIXED MOUNT CIRCUIT BREAKER

CUTLER HAMMER MDS608 800A AC POWER CIRCUIT BREAKER LSIG

UNUSED GE 225 KVA 460 to 240 VAC 9T23Q9887 TRANSFORMER

UNUSED OLSON 225 KVA 480 208Y/120 VAC TRANSFORMER

MATRA 225 KVA 4160V DRY TYPE TRANSFORMER 21744-1

GE 300 KVA 480 to 208Y/120 VAC 9T23B3878 TRANSFORMER

ASCO SERIES 300 260A 480V 3PH AUTOMATIC TRANSFER SWITCH

UNUSED CUTLER-HAMMER HMDL3800 CIRCUIT BREAKER W/ TRIP

GE TSP203F6 2000A 600VAC DO ELECT-OP CIRCUIT BREAKER

GE TSP203F2 2000A DRAW OUT ELEC OPS CIRCUIT BREAKER

TOSHIBA 800HP 3560RPM 4160V 355-1120 INDUCTION MOTOR

2003 CLUB CAR 4 PASSENGER GOLF/WORK FACILITY CART

2003 CLUB CAR CUSTOM GOLF/WORK CART W/ IQ & TOW SYSTEM

RUUD COMMERCIAL SERIES AIR CONDITIONING RLMB-A090DL

DAYTON SPEEDAIRE 120 GAL 15 HP 49 CFM AIR COMPRESSOR

MARATHON 200HP 890RPM 460V TEFC TFS ELECTRIC MOTOR

SIEMENS ALLIS 225 HP 1785 RPM 460V 445TS TEFC MOTOR

MAGNETEK M AC 350 HP 1780 RPM 460V 447T BK481236 MOTOR

RELIANCE 200HP 885RPM 460V TEFC 449TS ELECTRIC MOTOR

GE 150 KVA 2400 480Y/277 9T25B5835 G3 TRANSFORMER

MATRA 150 KVA 4160 208Y/120 VAC TRANSFORMER

ZINSCO 150 KVA 4160 208Y/120 VAC 14649-1 TRANSFORMER

SIEMENS-ALLIS 200HP 1785RPM 2300V 449T INDUCTION MOTOR

FEDERAL PACIFIC 300 KVA 480-208Y/120 T4T300 TRANSFORMER

FPE 300 KVA 480 208Y/120 VAC 9T21B9103 TRANSFORMER

TRANE 2TWA3042A4000AA 3.5T SS HEAT PUMP R-22 3-PHASE

CARRIER 38QE024300 2 TON SS/HP COMPRESSOR SECTION ONLY

MUELLER 105MAP-10 10″ FLANGED CHECK VALVE 160783

DAY AND NIGHT PHH036L0A00AAA 3T ROOFTOP AIR CONDITIONER

DAYTON 1/2 TON AIR CHAIN HOIST 152338

BLACK BOX KVT109A SERV-VIEW KVM TRAY 162735

CARRIER 19DM2321504 DISCHARGE VOLUTE 2 FOR 19D-SERIES

YORK D1NH042N06546 3.5T 80,000 ROOFTOP AIR CONDITIONER

BLACK BOX KVT122A#C RACKMOUNT TRAY 153538

YORK B3CH048A46C 4 TON ROOFTOP AIR CONDITIONER 150540

RACKMOUNTABLE KVM TRAY KVT122A-C 153238

BLACK BOX WS-C2950T-48-SI 48 PORT ETHERNET SWITCH

US ELECTRIC R724 10 HP MOTOR230/460 VOLT-1185 RPM 85040

MONITOR TS761A ACCESS UNIT 16-PORT ETHERNET SWITCH

DAY AND NIGHT PGF048L080F 4T ROOFTOP AIR CONDITIONER

MARS 60HV-WD-115 WASHDOWN AIR CURTAIN 152633

NORDYNE FG6TE120C-IQC 120,000 BTU 95% AFUE GAS FURNACE

DAY AND NIGHT PHF036L000E 3T ROOFTOP AIR CONDITIONER

YORK D2NA042N05646 3.5T 70,000 ROOFTOP AIR CONDITIONER

BLACK BOX MX261A#R3 MULTISERVER 3000 156377

INDUSTRIAL SCIENTIFIC TMX412-0080 4-GAS DETECTOR 146397

DAYTON 7.5 HP CENTRIFUGAL PUMP 230/460V 153288

BLACK BOX KVT125A-R2 8 PORT SERV-VIEW II ULTRA 163102

EAGLE GROUP CB3048SE ENCLOSED WORKTABLE 159607

MILLER BY SPERIAN DH-4 ALUMINUM HOIST – BASE COMPONENT

AQUA BATH C4136BF-FUS-3/4?-LH 36x41x82-3/8 SHOWER UNIT

NORDYNE FG6TE100C-IQB 100,000 BTU 95% AFUE GAS FURNACE

DAYTON 42″ CABINET EXHAUST FAN/RPM 482 156852

MANITOWOC AV3SG REACH IN COOLER CABINET 22553

CARLYLE 06ET265-160 25 HP SEMI HERMETIC A/C COMPRESSOR

TRANE 2TWA3042A4000AA 3.5T SS HEAT PUMP R-22 3-PHASE

CARRIER 38QE024300 2 TON SS/HP COMPRESSOR SECTION ONLY

MUELLER 105MAP-10 10″ FLANGED CHECK VALVE 160783

DAY AND NIGHT PHH036L0A00AAA 3T ROOFTOP AIR CONDITIONER

DAYTON 1/2 TON AIR CHAIN HOIST 152338

BLACK BOX KVT109A SERV-VIEW KVM TRAY 162735

CARRIER 19DM2321504 DISCHARGE VOLUTE 2 FOR 19D-SERIES

YORK D1NH042N06546 3.5T 80,000 ROOFTOP AIR CONDITIONER

BLACK BOX KVT122A#C RACKMOUNT TRAY 153538

YORK B3CH048A46C 4 TON ROOFTOP AIR CONDITIONER 150540

RACKMOUNTABLE KVM TRAY KVT122A-C 153238

BLACK BOX WS-C2950T-48-SI 48 PORT ETHERNET SWITCH

US ELECTRIC R724 10 HP MOTOR230/460 VOLT-1185 RPM 85040

MONITOR TS761A ACCESS UNIT 16-PORT ETHERNET SWITCH

DAY AND NIGHT PGF048L080F 4T ROOFTOP AIR CONDITIONER

MARS 60HV-WD-115 WASHDOWN AIR CURTAIN 152633

NORDYNE FG6TE120C-IQC 120,000 BTU 95% AFUE GAS FURNACE

DAY AND NIGHT PHF036L000E 3T ROOFTOP AIR CONDITIONER

YORK D2NA042N05646 3.5T 70,000 ROOFTOP AIR CONDITIONER

BLACK BOX MX261A#R3 MULTISERVER 3000 156377

INDUSTRIAL SCIENTIFIC TMX412-0080 4-GAS DETECTOR 146397

DAYTON 7.5 HP CENTRIFUGAL PUMP 230/460V 153288

BLACK BOX KVT125A-R2 8 PORT SERV-VIEW II ULTRA 163102

EAGLE GROUP CB3048SE ENCLOSED WORKTABLE 159607

MILLER BY SPERIAN DH-4 ALUMINUM HOIST – BASE COMPONENT

AQUA BATH C4136BF-FUS-3/4?-LH 36x41x82-3/8 SHOWER UNIT

NORDYNE FG6TE100C-IQB 100,000 BTU 95% AFUE GAS FURNACE

DAYTON 42″ CABINET EXHAUST FAN/RPM 482 156852

MANITOWOC AV3SG REACH IN COOLER CABINET 22553

CARLYLE 06ET265-160 25 HP SEMI HERMETIC A/C COMPRESSOR

US ELECTRIC T807 25HP MOTOR 208-230/460V 3530 RPM 81411

JACUZZI 9590958 55″ x 55″ ALMOND WHIRLPOOL BATH 160800

JACUZZI 9590969 55″ x 55″ OYSTER WHIRLPOOL BATH 160799

PORT-A-COOL PAC2K24HPVS PORTABLE EVAPORATIVE COOLING

SUNROC F110PM/F140PM WALL MOUNT DUAL WATER COOLER KIT

SUNROC DF-3401/DF-3301 WALL MOUNT DUAL WATER COOLER KIT

CARRIER 17FA5322514 INTAKE WALL 27″ IN DIAMETER 151061

BLACK BOX LS50124#R2 24-PORT CONSOLE SERVER 156412

JAMESBURY 815L-11-2236-TT 8″ BUTTERFLY VALVE 58224

CONSOLE SERVER 24-PORT LS50124-AE-R2 153146

TIRE VALVE EXTENSION-PACK OF 1000 161135

BLACK BOX LE2124A-R2 12 PORT AUTOCROSS 162964

RHEEM E10-12-G 10 GAL COMMERCIAL WATER HEATER 146358

LUXAIRE FL9C120D20DH11 120,000 BTU 95% GAS FURNACE

BLACK BOX KV1702C RECEIVE CARD 154166

NORDYNE FG6TE080C-IQB 80,000 BTU 95% AFUE GAS FURNACE

NORDYNE FG6TC120C-VCB 120,000 BTU 92% AFUE GAS FURNACE

DURAMETALLIC ADPJA000WD3 DURCHROME FACE INSERT 60975

BLACK BOX MX9071 8 CHANNEL STATISTICAL MULTIPLEXER

CARRIER 19DR501444 POPPET VALVE 152594

DUPONT 191301929E CHEMICAL PROTECTIVE GARMENTS 157318

ICP HC4H318AKA 1.5 TON HEAT PUMP SPLIT-SYSTEM R-410A

CARRIER 17M4211213 LABYRINTH 150339

CARYLE 06CY125G-103 10T SEMI-HERMETIC COMPRESSOR 55556

DUAL PORT T1 CARD FOR WAN RACK 16 MT511C 153398

THERMO SCIENCE NESLAB CIRC REFG HTG STAND 28L 115V

DAYTON 1-1/2 HP EXHAUST VENTILATOR 1090 RPM 164962

NORDYNE FG6TE060C-IQB 60,000 BTU 95% AFUE GAS FURNACE

PAYNE PG9YAB036080 80,000 BTU 95% GAS FURNACE 163074

GOODMAN AEPF426016 3.5 – 5 TON MULTI-POSITION FAN COIL

BLACK BOX LR0062AE# DSL LAN EXTENDER 850 156422

BLACK BOX LR0062A LAN EXTENDERS RATE 155273

SQUARE D DTU324N 200 AMP DOUBLE THROW SAFTEY SWITCH

NORTEL DM1401096 CONTIVITY 1100 EXTRANET SWITCH 163092

YORK D1HG036N04046B 3T 50,000 ROOFTOP AIR CONDITIONER

WESTWARD 10 TON AIR ASSIST HYDRAULIC SERVICE JACK 61175

EAGLE PI-7710 30 GALLON SAFETY CABINET 159943

YORK D2NA036N05646 3T 70,000BTU ROOFTOP AIR CONDITIONER

GOODMAN GPC1324H21 2 TON ROOFTOP AIR CONDITIONER 159162

GOODMAN GPC1324H21 2 Ton ROOFTOP AIR CONDITIONER 15916

GOODMAN GPC1324H21 2Ton ROOFTOP AIR CONDITIONER 159162

GOODMAN GPC1324H21 2t ROOFTOP AIR CONDITIONER 15916

WESTWARD 10 TON QUICK LIFT HYDRAULIC SERVICE JACK 63142

COMFORT STAR CHH09CA-13 0.75T MINI-SS HEAT PUMP R-410A

BURNHAM G1-125ND1-L2 125,000 HEATING BOILER 20323

DAY AND NIGHT PGF036L080F 3T ROOFTOP AIR CONDITIONER

VEE GEE SCIENTIFIC 3432 PORTABLE REFRACTOMETER 146145

WINSMITH 943MDSN METRIC SPEED REDUCER 30:1 58:RPM 96641

SANYO KS3632 3TON MINI-SPLIT INDOOR A/C UNIT WALL MOUNT

FLOWSERVE B/M375609 BELLOWS MECHANICAL SEAL KIT 89060

JAMESBURY 7150-31-3600XTZ 4 INCH BALL VALVE 160725

US ELECTRIC E680A 2 1/2 HP ADUSTABLE SPEED DRIVE 12860

BLACK BOX MX237C-2 CARD/MS TURBO VOICE/FAX-2 153423

WIEGMANN N412362408SSC METALLIC ENCLOSURE 162600

TRANE BAYECON091A 12-1/2 – 15 TON HORIZONTAL ECONOMIZER

BLACK BOX LB6540A-SM-LH ADAPTA-SWITCH 162874

HEATILATOR GDFL60I 3-SIDED GAS FIREPLACE 36″TALL 163349

CARRIER 17DA711253 NUT-6 FOOT HAND 152679

Perkins Elmer Las Inc. WE016539 ASSEMBLY TORCH MOUNT-AD

APOLLO A650XRPDTL5 50 GALLON GAS WATER HEATER 165305

VIBCO JVS INTERNAL CONCRETE ELEC VIBRATOR 115V 150624

DAY AND NIGHT PHS036L0A00AAA 3T ROOFTOP AIR CONDITIONER

BAY NETWORKS 329390 BRINET MODULES/ASN PLATFORMS 153052

ELKAY SS81241 STEEL SCULLERY SINK/1 FAUCET HOLE 160924

MINUTEMAN M20130-00 1500 RPM FLOOR BURNISHER 40767

RUUD UGPL-07EBRQR 75,000 BTU 2-STAGE GAS FURNACE 150846

APOLLO A675XRPDTL 75 GALLON GAS WATER HEATER 165294

REZNOR F400-E 400,000 INPUT 80% GAS UNIT HEATER 13802

BLACK BOX EB-LR0003A-2UE1 INTERNET ACCESS ROUTER 2

NORDYNE FG6TE060C-VB 60,000 BTU 95% AFUE GAS FURNACE

RHEEM RPNL-048JAZ 4 TON SPLIT SYSTEM HEAT PUMP 13 SEER

DAYTON 48″ EXHAUST FAN 2 TO 7.5 HP 160339

MULTIPLEX 2242M COUNTERTOP DISPENSING UNIT 22546

KNF FLEX PAK 49P1000 BAGS INDY POLY 4M 12 x 16 146143

THERMO SCIENTIFIC IEC3581 CENTRIFUGE MICROLITE 145852

BLADOR 39N090W857H1 40 HP ELECTRIC MOTOR 3500 RPM 50254

TRANE 2TEE3C31A1000A 2-1/2 TON MULTIPOSITION FAN COIL

JACUZZI H547969 72″ OYSTER WHIRLPOOL RIGHT-HAND DRAIN

MICRO METROLOGY SYSTEMS MMS20541 COLOR PRINTING PACK

CONSOLE SERVER 16-PORT LS50116-AE-R2 154161

MITSUBISHI PKH18EK 18,000 BTU MINI SS HEAT PUMP 148243

MAJICAIRE MBVD20 3/4 HP FAN COIL UNIT/BELT DRIVE 148603

BLACK BOX MT200A-449/449-?R2 T1 MULTIPLEXOR 156970

NORDYNE FG6TE060C-VA 60,000 BTU 95% AFUE GAS FURNACE

DURAMETALLIC B/M138099 SINGLE INSIDE PSS PARTS 56392

BLACK BOX SC121A 2×2 MATRIX SWITCH 162921

JACUZZI R090959 CETRA 536 WHIRLPOOL TUB LEFT HAND DRAIN

RADIOLAN RMG-397-25P WIRELESS NETWORK BRIDGE 164505

DAY AND NIGHT N4A336GLB 3T SS AIR CONDITIONER R410A

ELKAY EWS2520-1H SURGEON STAINLESS STEEL SINK 160629

DAYTON 2HP GRINDER PUMP 480 VOLT 3 PHASE 69836

DAYTON 250,000 BTU VENTED UNIT HEATER 165123

BLACK BOX FX68240A# PHONE LINE MANAGER 162725