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主营AB/ABB/GE/施耐德/本特利/ TRICONEX 巴赫曼/西屋/黑马 福克斯波罗 霍尼韦尔 等PLC 模块卡件
PLC以微处理器为核心，具有微机的许多特点，但它的工作方式却与微机有很大不同。
微机一般采用等待命令的工作方式工作。
PLC是按集中输入、集中输出，周期性循环扫描的方式进行工作的。每一次循环扫描所用的时间称为一个扫描周期。
对每个程序，CPU从条指令开始执行，按顺序逐条地执行指令做周期性的程序循环扫描，如果无跳转指令，则从条指令开始逐条顺序执行用户程序，直至结束又返回条指令，如此周而复始不断循环。
PLC在每次扫描工作过程中除了执行用户程序外，还要完成内部处理、输入采样、通信服务、程序执行、自诊断、输出刷新等工作。PLC工作的全过程包括三个部分，即上电处理、扫描过程和出错处理。PLC工作的全过程可用图4所示的运行框图来表示。
PLC通电后，CPU在系统程序的控制下行内部处理，包括硬件初始化、I/O模块配置检查、停电保持范围设定及其他初始化处理等工作。
LESER 4411.4404 IRON FLANGED RELIEF VALVE 40X65MM 8BAR D556730
FARRIS 1855 95PSI 1-1/2 IN NPT 1362CFM STEEL THREADED RELIEF VALVE D564371
MERCER 81-17151V13G11 STEEL RELIEF VALVE 1751CFM 500PSI 1IN NPT D586314
WATER WELL PUMP PRESSURE RELIEF VALVE 210-01 TLRV 1IN X 3/4IN NPT D576764
HENRY 560A IRON THREADED RELIEF VALVE 150PSI 1/2X3/4IN FNPT D585369
HENRY 560A IRON THREADED RELIEF VALVE 150PSI 1/2X3/4IN FNPT D585361
KUNKLE 6182FE01 BRONZE THREADED RELIEF VALVE 45PSI 1IN NPT 349SCFM D585544
FARRIS 2745/S4 STAINLESS RELIEF VALVE 1/2 IN NPT 290PSI 22GPM D565279
CONSOLIDATED 1980C2 300PSI 1 IN NPT 145GPM STEEL RELIEF VALVE D563481
HYDROSEAL 1BV-30 STAINLESS RELIEF VALVE 1/2IN NPT 5.5GPM 250PSI D597648
LUKENHEIMER 1226C 110PSI 2 IN NPT 741CFM BRONZE RELIEF VALVE D544347
KUNKLE 337-H01 15PSI 2 IN NPT 903CFM THREADED RELIEF VALVE D551862
ANDERSON GREENWOOD 81PS1S8A12A-4 125PSI 16GPM 1IN FLANGED RELIEF VALVE D577800
WELLMARK W9501-RSB 1200 SAFETY RELIEF VALVE 1IN X 1IN 2421SCFM 900PSI D591035
HANSEN H56 1/2X3/4IN NPT 150PSI STEEL REFRIGERATION RELIEF VALVE D539913
PLAST-O-MATIC 3/4IN NPT PVC THREADED RELIEF VALVE D599614
J.E. LONERGAN LCT-14 STEEL RELIEF VALVE 322CFM 225PSI 3/4 X 1IN NPT D597629
SPENCE ENGINEERING 31GF BRONZE THREADED RELIEF VALVE 1-1/4IN NPT 100PSI D599492
HYDROSEAL 2CXV00-E 3150PSI 87GPM 3/8 X 1/2 IN NPT RELIEF VALVE D534022
KUNKLE 20-E01-MG 115PSI 1 IN NPT 38GPM BRONZE THREADED RELIEF VALVE D556852
NAKAKITA NS255 A-H 25X50MM 1 IN NPT 93KG/H 0.5KGF/CM2 RELIEF VALVE D539060
DRESSER 1543D-21 15PSI 1/2 IN 157LBS-HR STEEL THREADED RELIEF VALVE D552887
CROSBY 951400MA 1/2X1IN NPT 300PSI 456CFM STEEL RELIEF VALVE D564522
FARRIS 2745/S4 STAINLESS RELIEF VALVE 1/2 IN NPT 290PSI 404CFM D565281
KUNKLE 1-D01-LC 295LB/H 60PSI 3/4 IN NPT SAFETY RELIEF VALVE D554574
AQUATROL 69 150PSI 1/2 IN NPT 22GPM BRONZE THREADED RELIEF VALVE D559257
KUNKLE 20-E01-MG 15PSI 1 IN 14GPM NPT BRONZE THREADED RELIEF VALVE D558715
FULFLO VJF5R 1 IN STEEL FLANGED RELIEF VALVE D556322
GRIFFCO BPV050P BACK PRESSURE VALVE PVC 0-150PSI 50PSI 1/2 IN NPT D579308
MERCER 91-17D31V07I2 FLANGED RELIEF VALVE 1IN 60PSI D596608
CROSBY JR-U-CA RELIEF VALVE 18GPM 80PSI 1/2 X 1IN NPT D597652
CROSBY VALVE & GAGE JRS-A THREADED RELIEF VALVE 80PSI 1/2 X 1IN NPT D595642
CROSBY VALVE & GAGE JRSA THREADED RELIEF VALVE 150PSI 3/4 X 1IN NPT D596560
CONBRACO 11-701-21 100PSI 2 IN NPT 2414LB/HR BRONZE RELIEF VALVE D531147
FARRIS 1850 250PSI 1/2 IN NPT STEEL THREADED RELIEF VALVE D563806
FOSTER VI080BDO 10-28PSI 2 IN BRONZE THREADED RELIEF VALVE D563562
VIKING C-1 PRESSURE OPERATED RELIEF VALVE 1/2 IN NPT BRASS D569284
FISHER 298A-1 0.70 SPRING LOADED RELIEF VALVE 3-13PSI 1/4IN NPT D599436
LONERGAN L14B-C40-LS STEEL RELIEF VALVE 700PSI 1/2IN NPT D599794
FARRIS 1875-0L 30PSI 1/2 IN NPT RELIEF VALVE D567138
WATTS 1XL M6STD.Z21.22 150PSI 1/2IN NPT PRESSURE RELIEF VALVE D587869
CYRUS 803 STEEL RELIEF VALVE 246CFM 100PSI 1/2IN NPT D594755
CIRCLE SEAL P75-344 2440PSI 1/2 IN NPT BRASS RELIEF VALVE D561507
WATTS M3 174A 75PSI 3/4IN NPT BRONZE PRESSURE SAFETY RELIEF VALVE D594792
REGO PRV9434T CRYO-FLOW 375PSI 1/2 IN NPT BRASS RELIEF VALVE D567635
BELL & GOSSETT 4100 4100000 BTU/HR 30PSI 2 IN NPT IRON RELIEF VALVE D522943
WATTS M3 174A 150PSI 3/4 IN NPT BRASS THREADED RELIEF VALVE D567421
WL HAMILTON 1/2IN NPT 40PSI BRONZE THREADED RELIEF VALVE D552327
CASH ACME NCLX-5 TEMPERATURE PRESSURE 3/4 IN NPT RELIEF VALVE D562073
WATTS 100XL 150PSI 3/4 IN NPT BRASS RELIEF VALVE D562069
MANSFIELD 451 26662-005 PRESSURE RELIEF VALVE 75PSI 1/2 IN NPT BRASS D577178
LIMITORQUE SMB SIZE 4T 14.4HP 1900RPM L0218AR4 250V-DC VALVE ACTUATOR D555245
LIMITORQUE L120-190 4HP 575V-AC VALVE ACTUATOR D568990
LIMITORQUE SMB SIZE 2 8HP 3510RPM X0215 550V-AC VALVE ACTUATOR D555244
DODGE 132429 6 SLV RTL LINER ASSEMBLY BEARING D515854
DODGE 132594 SLEEVOIL 10XC LINER BEARING 10IN D497462
FLOWSERVE L120-190 LIMITORQUE DS204 250V-DC VALVE ACTUATOR D555272
LIMITORQUE SMA SIZE 3 4HP 250V-DC VALVE ACTUATOR D567728
ROSEMOUNT 3D39441G09 WORLD CLASS 3000 9FT ANALYZER HEATER PROBE D577132
LIMITORQUE SMA 550V-AC SIZE 1 VALVE ACTUATOR D568830
BECK 11--01 ELECTRONIC CONTROL DRIVE ACTUATOR 120V 1PH D584153
METSO P4610370 KAJAANI MCA MICROWAVE CONSISTENCY TRANSMITTER DISPLAY D594724
EL-O-MATIC PS4000.U0A14A.00K0 PNEUMATIC VALVE ACTUATOR D597213
AUMA SA 10.1-FA10 GZ 25.1 GS250 ELECTRIC VALVE ACTUATOR D560956
AUMA SA07.5 GS200.3/GZ200.3 AD63-2/80 864:1 ELECTRIC ACTUATOR D562557
SIEMENS 6DR52100EN000AA0 VALVE POSITIONER D553034
FLOWSERVE L120-40 LIMITORQUE 1HP VALVE ACTUATOR D555066
DODGE 132954 SLEEVOIL BEARING LINER ASSEMBLY 4-15/16IN D521952
ROTORK SM-5120-N-1-48/300-90 VALVE DAMPER ROTARY ACTUATOR D538452
SIEMENS 6DR5215-0EN00-0AA0 SIPART PS2 ELECTRO-PNEUMATIC POSITIONER D554224
LIMITORQUE L120-40 1.8HP 1900RPM MSG0056Y 250V-DC VALVE ACTUATOR D555275
SIEMENS P1051AD 5-7/8IN ID PUMP STEEL BUSHING D511529
SIEMENS 6DR5215-0EN00-0AA0 SIPART PS2 ELECTRO-PNEUMATIC POSITIONER D554223
ROOTS DRESSER RK10AVBOO 10IN ROTARY LOBE BLOWER REPAIR KIT D583917
FLOWSERVE CSCPX1750EAXVS STAINLESS PUMP SEAL CARTRIDGE 1.75IN D561308
ROTORK 40AFA25A 575V-AC 3PH 5.9HP 500LB-FT ELECTRIC VALVE ACTUATOR D565521
EIM MDF3-4 M2CP 2000 ROTORY VALVE ACTUATOR CONTROLLER ASSEMBLY D566173
ROSEMOUNT 4847B61G04 OXYMITTER 4000 ANSI 6FT CELL REPLACEMENT KIT D592368
VALVCON LVWX2500KS2N115AC JAMESBURY VALVE ACTUATOR 115V-AC D554431
JOHN CRANE 1-82982 T1648LP TYPE 1648LP 3-1/4IN STAINLESS PUMP SEAL D528859
MOYNO SS A2D5020 15-1/4IN STAINLESS PUMP ROTOR D595422
EL-O-MATIC EL-2500 ELECTRIC ROTARY VALVE ACTUATOR D594705
SIEMENS 6DR5110-0NN01-0AA3 SIPART PS2 SMART VALVE POSITIONER D583320
SIEMENS 6DR5110-0NN01-0AA3 SIPART PS2 SMART VALVE POSITIONER D583495
JORDAN CONTROLS ROTORK SM-1730-D-1-12/1200-90 ROTARY ACTUATOR 120V D569894
EL-O-MATIC PD4000.U0A00A.00K0 PNEUMATIC VALVE ACTUATOR 116PSI D594763
JORDAN CONTROLS ROTORK SM-1730-D-1-12/1200-90 ROTARY ACTUATOR 120V D569896
SIEMENS 6DR5210-0EN01-0AA3 SIPART PS2 SMART VALVE POSITIONER D583322
ROTORK A14 0.6HP 575V-AC 120LB-FT 3PH VALVE ACTUATOR D565866
EL-O-MATIC PS2500.U0A14A.00K0 PNEUMATIC VALVE ACTUATOR 116PSI D594769
GOULDS RC04051A 1012 13IN TAPER BORE IRON STUFFING BOX COVER D579941
METSO NP704/B1S1A NELES PNEUMATIC VALVE POSITIONER D553381
EIM Q7N2-6 M2CP 2000 ROTORY VALVE ACTUATOR CONTROLLER ASSEMBLY D566468
PUMP IMPELLER 25IN OD 3IN THREADED ID 4 VANE D566179
ABB V0001 TZIDC ELECTRO PNEUMATIC VALVE POSITIONER D597872
SIEMENS 6DR5210-0EN01-0AA3 SIPART PS2 SMART VALVE POSITIONER D583326
WEIR 38777 31IN OD 14-1/8IN EYE SLURRY PUMP IMPELLER 4-VANE D563691
FLOWSERVE 120CHTA59AX5 R-655-3 STEEL BALANCE SLEEVE D568833
DODGE 132225 SLEEVOIL SIZE 8 RT THRUST PLATE KIT D559923
WEIR DAM005XLM BEARING CARTRIDGE ASSEMBLY SLURRY CENTRIFUGAL PUMP D598798
HONEYWELL 0102660-1-0000-00001000-00 120V-AC ACTUATOR D514336
WEIR 59111 31IN OD 12IN EYE SLURRY PUMP IMPELLER 4-VANE D580528
FLOWSERVE GEB422246DB-C JS STAINLESS SPLIT PUMP SEAL D569456
EIM 9H5753FC-C 1/4HP 575V-AC 3PH ELECTRIC VALVE ACTUATOR D579678
SIEMENS 6DR5210-0EN00-0AA3 SIPART PS2 HART VALVE POSITIONER D566823
FLOWSERVE RG316SR7SN0GE00 AUTOMAX PNEUMATIC VALVE ACTUATOR D580127
SUDMO D630 2141403 SANITARY DOUBLE SEAT STAINLESS VALVE ACTUATOR D568754
MASONEILAN DRESSER SVI2-21123121 DIGITAL VALVE POSITIONER D583853
ATLAS COPCO 2906-0298-00 AIR COMPRESSOR SERVICE KIT D552484
NELES JAMESBURY QPX4C/K40 QUADRA-POWR X VALVE ACTUATOR D553767
DEZURIK 425939T CONSISTENCY TRANSMITTER PIPELINE MODULE D585020
GOULDS RC04113A011216 CD4MCU 10IN TAPER BORE STUFFING BOX COVER D567031
STURM 0M0 6 VANE 23 IN OD 4-1/4 IN ID BRASS PUMP IMPELLER D524514
FLOWSERVE MY49112A130-D4 5-VANE 13IN OD STAINLESS PUMP IMPELLER D522044
AUMA SA07.5 VD63-2/45 ELECTRIC VALVE ACTUATOR 575V-AC D565896
FLOWSERVE 67128 3-5/8IN X 98IN STEEL PUMP SHAFT D594784
DRESSER L3382-2 13-1/2IN STEEL PUMP IMPELLER D598830
FALK 0706057 14F COUPLING GRID D558317
SCHUNK 358200 SRU 50.2 PNEUMATIC ROTARY ACTUATOR D596009
CHESTERTON 255-38 SHAFT SIZE 4.750 DUAL CARTRIDGE SEAL D584687
METSO NE724/S1A-CE01 NELES ELECTRO-PNEUMATIC VALVE POSITIONER D554568
FLOWSERVE RG314SR3SN0GE00 AUTOMAX PNEUMATIC VALVE ACTUATOR D579957
VANE STAINLESS PUMP IMPELLER C256 80AC 3194 19IN OD 2-5/16IN ID D581636
MOYNO S7211 CAVITY PUMP ROTOR D591484
NELES JAMESBURY QPX3C/K35 QUADRA-POWR X VALVE ACTUATOR D555682
EIM 9H4603FC-E ROTARY VALVE ACTUATOR CONTROLLER ASSEMBLY D577857
FISHER DVC6010F FIELDVUE VALVE POSITIONER D574629
FISHER DVC6020F FIELDVUE VALVE POSITIONER D574628
MARPOSS 3602220005 HYDRAULIC SLIDE CYLINDER VALVE D586478
THERMO SCIENTIFIC 112980-01 HG LAMP KIT FOR MERCURY ANALYZER D588443
HARMONIC DRIVE CSS-25-50-2A-GR-SP GEAR REDUCER COMPONENT SET D591585
HARMONIC DRIVE SH-25-50-2A-GR-SP GEAR REDUCER COMPONENT SET D591582
SIEMENS 6DR5010-0NN00-0AA0 SIPART PS2 I/P POSITIONER D591042
FISHER DVC6020 FIELDVUE VALVE POSITIONER D586025
LIMITORQUE SMB-00 3PH 1700RPM 575V-AC ACTUATOR D562087
TOKAI MATIERIALS 300X60 5KB-D553 BRAKE PAD D592025
LIMITORQUE L120-10 230/460V-AC 3PH VALVE ACTUATOR D598493
WAUKESHA 060 U2 ROTARY LOBE PUMP GEAR CASE ASSEMBLY D546612
KOCSIS CMO-308084-A HYDROTOR HYDRAULIC MOTOR CRANKING STARTER D596584
GOULDS 3196 MT CENTRIFUGAL IRON PUMP POWER END D594038
FLOWSERVE EK1144 SL-5000 2.875 CW PUMP SEAL KIT D561392
ROTORK 11AFA10A 575V-AC 0.24HP 50LB-FT ELECTRIC VALVE ACTUATOR D562379
FISHER 29A3667X022 CONTROL VALVE SEAT RING D531461
INGERSOLL C06568-02-00-728 21 IN OD CENTRIFUGAL BRASS PUMP IMPELLER D532959
MORIN B-023U-D000 STAINLESS ROTARY VALVE ACTUATOR D591927
EL-O-MATIC ES1600.U1A04A.46K0 PNEUMATIC ACTUATOR VALVE REPLACEMENT PART D599271
EL-O-MATIC ES1600.U1A04A.46K0 PNEUMATIC VALVE ACTUATOR 116PSI D599521
GEA BLOUUOOCV0320 TUCHENHAGEN STAINLESS SANITARY ACTUATOR D566185
EIM 9H5753FC-D ROTORY VALVE ACTUATOR CONTROLLER ASSEMBLY D578308
VALVCON VW600KS2TN115AC ELECTRIC VALVE ACTUATOR 115V-AC D579477
SUNDSTRAND MCV104A5901 ELECTOHYDRAULIC PUMP STROKE CONTROLLER D591615
SUNDSTRAND MCV104A5902 ELECTRONIC DISPLACEMENT CONTROLLER D598870
DEZURIK 425939T ACCUTRAX CONSISTENCY TRANSMITTER PIPELINE MODULE D593259
FLOWSERVE PRESSURE REDUCING PUMP SHAFT SLEEVE D583894
GOULDS 3196 MTX 3X4-13 IRON PUMP POWER END D599255
WEIR WARMAN E4110A05 SLURRY PUMP VOLUTE LINER D599771
FLOWSERVE CE4A2TAX CENTURA CE ROTARY VALVE ACTUATOR 115V-AC D595402
JOHN CRANE 1-RBA20771 CFSP-101317 TYPE 88SRS 2.125IN PUMP SEAL KIT D564732
FLOWSERVE 134625-GS DURA SEAL CARTRIDGE PUMP SEAL ASSEMBLY D522737
ANDCO 8417T POSI-TORK ELECTRIC LINEAR ACTUATOR 1.26HP 230/460V-AC 38IN D586468
MOYNO TS A2A5000 10IN STAINLESS PUMP ROTOR D587612
FISHER 3582 VALVE POSITIONER 3-15PSI D585782
PACO K0312-1 GENUINE PARTS KIT D574487
LIMITORQUE L120-10 MULTI-TURN ELECTRIC VALVE ACTUATOR D559551
