目前，在连续型流程生产自动控制（PA）或习惯称之谓工业过程控制中，有三大控制系统，即PLC、DCS和FCS。它们各自的基本特点如下:
1 PLC
（1）从开关量控制发展到顺序控制、运送处理，是从下往上的。
（2）连续PID控制等多功能，PID在中断站中。
（3）可用一台PC机为主站，多台同型PLC为从站。
（4）也可一台PLC为主站，多台同型PLC为从站，构成PLC网络。这比用PC机作主站方便之处是:有用户编程时，不必知道通信协议，只要按说明书格式写就行。
（5）PLC网格既可作为独立DCS/TDCS，也可作为DCS/TDCS的子系统。
（6）大系统同DCS/TDCS，如TDC3000、CENTUMCS、WDPFI、MOD300。
（7）PLC网络如Siemens公司的SINEC—L1、SINEC—H1、S4、S5、S6、S7等，GE公司的GENET、三菱公司的MELSEC—NET、MELSEC—NET/MINI。
（8）主要用于工业过程中的顺序控制，新型PLC也兼有闭环控制功能。
（9）制造商:GOULD（美）、AB（美）、GE（美）、OMRON（日）、MITSUBISHI（日）、Siemens（德）等。
公司主营产品有:AB,ABB,GE,西门子,力士乐，施耐德,福克斯，等工业自动化控制配件及各种停产备件。诚信经营，质量可靠，请放心购买，我们将竭诚为您服务！
UNIVERSITY SOUND MILC45 PAGE / TALK BACK HORN
UNIVERSITY SOUND MM2 SUBMERGENCE PROOF SPEAKER
US BEARING AND DRIVE CONVEYOR BELT 282111
US ELECTRIC B31JR60BY012 MOTOR 5 HP 3 PH 1160/945 RPM 380-480/346-415 VOLT
US ELECTRIC E406 HIGH EFFICENCY INDUSTRIAL MOTOR 15HP 3540RPM PH3
US ELECTRICAL 750650X01W320R071M AC MOTOR 15HP 3PH 230/460 VOLT
US ELECTRICAL B038 MOTOR 10 HP 3500 RPM 3 PH 208-230/460 VOLT 60 Hz
US ELECTRICAL E391-50-S07S094R011M MOTOR 2HP 3PH 60HZ 230/460V
US ELECTRICAL MOTOR MODEL F071 1 HP 1 PH 1725 RPM
US ELECTRICAL MOTOR MODEL F856 1HP
US ELECTRICAL MOTORS G322 MOTOR 2 HP 3 PH 1735 RPM 230/460 VOLT 6.2-3.1 AMP
US ELECTRICAL UNICLOSED MOTOR 5HP 3 PHASE 208/220/440 VOLT 215 FRAME
US ELECTRICAL UNICLOSED MOTOR 5HP 3 PHASE 208/220/440 VOLT 215 FRAME
US ELECTRICAL UNIMOUNT 125 B044A 15HP AC MOTOR 3 PHASE
USG D110561M SOLFRUNT 4-1/2" LIQUID FILLED PROCESS GAUGE 0-4000 KPA RANGE
USHIO QIH480-2500/S BOX OF QUARTZ INFRARED HALOGEN LAMPS QTY 6
USHIO USH-255BY SUPER HIGH PRESSURE MERCURY LAMP
USHIO USH-350DP SUPER HIGH PRESSURE SHORT ARC MERCURY LAMP 350W
USHIO XIR/HD/A 191093 LAMP TUBE EMITTER HALOGEN INFRARED HEATER 235V 1000W
USTC LC10MC050 THERMAL TOOL PRE CHILLER SYSTEM
UTI INSTRUMENTS RF GENERATOR MODEL 2221
UTICA CH-150 ADJUSTABLE TORQUE WRENCH 0-150 IN/LB 5/16" WRENCH SIZE
UTICA MODEL A5 CLICK TYPE TORQUE SENSING WRENCH WITH LB122 3/8" 12 PT HEAD HEX
UTICA TS-100 TORQURE-LIMITING SCREWDRIVER
UTICA TS-30 TORQURE-LIMITING SCREWDRIVER
UTICA TS-35 TORQURE-LIMITING SCREWDRIVER
UTICOR 150115N2L16EX OPERATOR INTERFACE DISPLAY
UVEXS SCU110B ULTRAVIOLET SPOT CURING UNIT (MODEL 13197B 110V 5A 50/60HZ)
UVP ULTRA VIOLET PRODUCTS BLAK-RAY B-100Y MICROSCOPE UV INSPECTION LAMP
VACUUBRAND ME 2SI/1.9 DIAPHRAGM VACUUM PUMP
VACUUBRAND ME4SI/3,7 DIAPHRAGM VACUUM PUMP
VACUUM BREAKER STEAM TANKER STAINLESS STEEL
VACUUM FITTING 304 STAINLESS STEEL ELBOW 44" KF-50 NW50 TO KF-25 NW25
VACUUM FITTING 304 STAINLESS STEEL ELBOW 44" KF-50 NW50 TO KF-25 NW25
VACUUM FITTING 304 STAINLESS STEEL ELBOW 44" KF-50 NW50 TO KF-50 NW50 LONG
VACUUM FITTING 304 STAINLESS STEEL ELBOW 44" KF-50 NW50 TO KF-50 NW50 LONG
VACUUM FITTING ADAPTER STAINLESS STEEL COPPER CERAMIC BRAKE KF-40 NW40
VACUUM FITTING ADAPTER STAINLESS STEEL ISO NW200 TO 9" 8 BOLT HOLE W/ KF25 BLEED
VACUUM FITTING ASSY STAINLESS STEEL KF-50 NW50 KF-40 NW40 WITH BLEED 28" X 20"
VACUUM FITTING BLANK BLIND BOLTED FLANGE 5" 127MM OD STAINLESS STEEL 4 BOLT HOLE
VACUUM FITTING BLANK BLIND BOLTED FLANGE ISO NW-100 W/ 4 BOLT HOLES STAINLESS
VACUUM FITTING CENTERING RING PUMP INLET SCREEN 6" OD FOR PUMP
VACUUM FITTING CONICAL REDUCER NW-80 TO NW-40 FLANGE
VACUUM FITTING FLEXIBLE BELLOW HOSE NW-80 ISO 80 STAINLESS STEEL 6" L THIN
VACUUM FITTING FLEXIBLE BELLOW HOSE NW-80 ISO 80 STAINLESS STEEL 6" LENGTH
VACUUM FITTING FLEXIBLE BELLOW KF-50 NW50 COUPLING
VACUUM FITTING FLEXIBLE BELLOW KF-50 NW50 COUPLING STAINLESS STEEL BRAID HOSE
VACUUM FITTING FLEXIBLE BELLOW STAINLESS STEEL KF-40 NW40 37" LENGTH ISO-KF
VACUUM FITTING FLEXIBLE HOSE STAINLESS STEEL ADAPTER KF-25 NW25 TUBE FITTING
VACUUM FITTING KF-25 NW25 CROSS 4-WAY MACHINED ALUMINUM ISO-KF FLANGE
VACUUM FITTING KF-40 TO 98MM FLANGE REDUCER
VACUUM FITTING MACHINED ALUMINUM KF-16 NW16 CROSS 4-WAY ISO-KF FLANGE
VACUUM FITTING REDUCER SIZE NW-80 TO NW-100
VACUUM FITTING SPOOL ADAPTER 285MM BOLTED FLANGE VAT VALVE FITTING ALUMINUM
VACUUM FITTING STAINLESS REDUCER W/ BLEED KF-40 NW40 TO 63 NW63 REDUCING
VACUUM FITTING STAINLESS STEEL 8" CF BLANK BLIND FLANGE 20 BOLT HOLES
VACUUM FITTING STAINLESS STEEL ADAPTER 6" FLANGE CF TO 11.5" FLANGE CALWELD
VACUUM FITTING STAINLESS STEEL ADAPTER 6" FLANGE CF TO 11.5" FLANGE CALWELD
VACUUM FITTING STAINLESS STEEL ADAPTER KF-25 NW25 TO 1" NPT W/ SMC SILENCER
VACUUM FITTING STAINLESS STEEL ADAPTER KF-40 NW40 6 WAY CROSS COMPRESSION CAPS
VACUUM FITTING STAINLESS STEEL ASA 4.5" OD ADAPTER WITH COMPRESSION 1" TUBE
VACUUM FITTING STAINLESS STEEL ASA 4.5" OD ADAPTER WITH COMPRESSION 1" TUBE
VACUUM FITTING STAINLESS STEEL ASA FLANGE BLANK BLIND 5-1/8" OD BORED
VACUUM FITTING STAINLESS STEEL BLANK BLIND BOLTED FLANGE NW-100 ISO 6.5" DIA
VACUUM FITTING STAINLESS STEEL BLANK BLIND FLANGE 4 BOLT HOLES 5" OD
VACUUM FITTING STAINLESS STEEL BLANK BLIND FLANGE ISO LF 160 NW160
VACUUM FITTING STAINLESS STEEL CENTERING RING INLET SCREEN KF-40 NW40
VACUUM FITTING STAINLESS STEEL CONICAL REDUCING TEE KF-40 NW40 KF-25 NW25
VACUUM FITTING STAINLESS STEEL ELBOW 90° 90 DEGREES KF-50 NW50 7" X 7"
VACUUM FITTING STAINLESS STEEL ELBOW 90° KF-50 NW50 VCR SWAGELOK SS-4BK-V51-1C
VACUUM FITTING STAINLESS STEEL ELBOW ISO LF 80 NW-80 90° 90 DEGREES KF-80
VACUUM FITTING STAINLESS STEEL ELBOW KF-50 NW50 FITTING 1/2" 1/4" 4 8 VCR BELLOW
VACUUM FITTING STAINLESS STEEL FEEDTHROUGH ? KF-40 NW40 TO 5/8" COMPRESSION
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW 3" TUBE OD ENDS 5.5" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW HOSE ISO 100 NW100 FLANGE SST 6"
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO KF-50 NW50 6" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO LF 100 NW100 10.5" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO LF 100 NW100 4" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO LF 100 NW100 5-3/4" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO LF 63 NW63 5" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO LF 63 NW63 6" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW ISO LF 63 NW63 FLANGE 6" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW KF-25 NW25 FLANGE 38" LENGTH
VACUUM FITTING STAINLESS STEEL FLEXIBLE BELLOW KF-25 NW25 FLANGE 46" LENGTH