描述
350042M
从时间调度上来说。
PLC的程序一般不能按事先设定的循环周期运行。PLC程序是从头到尾执行一次后又从头开始执行。（现在一些新型PLC有所改进，不过对任务周期的数量还是有限制）而DCS可以设定任务周期。比如，快速任务等。同样是传感器的采样，压力传感器的变化时间很短，我们可以用200ms的任务周期采样，而温度传感器的滞后时间很大，我们可以用2s的任务周期采样。这样，DCS可以合理的调度控制器的资源。
从网络结构发面来说。
一般来讲，DCS惯常使用两层网络结构，一层为过程级网络，大部分DCS使用自己的总线协议，比如西门子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等，这些协议均建立在标准串口传输协议RS232或RS485协议的基础上。现场IO模块，特别是模拟量的采样数据（机器代码，213/扫描周期）十分庞大，同时现场干扰因素较多，因此应该采用数据吞吐量大、抗干扰能力强的网络标准。基于RS485串口异步通讯方式的总线结构，符合现场通讯的要求。
WESTINGHOUSE RD316T36W 1600A LSIG CIRCUIT BREAKER
GE ELECTRIC 225-100-56-25HP 1790-1190-895-595RPM 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
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