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PLC经过不断地发展，一般都具有“开关I/0、模拟I/0、网络通信”功能；然而，工程师们只需要使用开关I/O、少量的模拟I/O、以及简单的编程技巧，就可开发出约80%的工业应用。
①(单机独立完成)开关量的采集与控制
如：电动机的启停、定时控制，电磁阀的开阀、关阀控制，仓库门的开门、关门控制，产品的计数控制，机械手、生产线、组合机床、电梯等设备的运行控制，等等。
②(单机独立完成)模拟量的采集与控制
如：温度、压力、流量等过程量的采集与PID控制，位移、速度等运动量的采集与控制。
③(与上位机连网)作为高级系统(如集散型控制系统DCS)现场端的采集器和控制器
1-n台PLC与上位机(工控机IPC、人机界面HMI等)连网通信，由上位机实现“集中管理”，由PLC实现“分散采集+分散控制”/或“集中采集+集中控制”。
GLI GREAT LAKES T53A4A1N MODEL 53 115/230V-AC 10 VA TURBIDITY ANALYZER B426423
NEW BAILEY MODEL TB510 TBI PH ANALYZER D386347
GLI GREAT LAKES 672F3C1B0NN 672F FLOW OPERATOR MODULE ANALYZER B329594
NEW SWAN 22.411.000 AMI-2 OXYTRACE LOW LEVEL OXYGEN MONITOR D514416
NEW FOXBORO 873EC-AIPFGZ ELECTRODELESS CONDUCTIVITY 0-50MS/CM ANALYZER B319752
NEW ROSEMOUNT 1054APH PH MICROPROCESSOR ANALYZER D404328
IN-USA IN-2000-1 LOCON OZONE LEVEL LEAK DETECTOR MONITOR ANALYZER B213426
ROSEMOUNT 54EC-01 CONDUCTIVITY RESISTIVITY 230V-AC 8W ANALYZER B332737
ROSEMOUNT IFT 6A00178G01 115V-AC CLASS 3000 FLUE GAS OXYGEN ANALYZER B331501
ROSEMOUNT 1003 UNILOC W/0-14PH SCALE ANALYZER B401975
WESTINGHOUSE IW04037G10 FLUE GAS 115/220V-AC INTERFACE PANEL ANALYZER D423828
FOXBORO 873PH-AIYCGZ PH/ORP 7-11PH ST CK 120V-AC 10.2W ANALYZER B411604
OSMONICS CL2-03/A15R 2.11 OREC DISSOLVED OZONE MONITOR MODULE ANALYZER B213291
AIRSERCO 6800 START-O-METIC 110/220V-AC ANALYZER B322257
WESTINGHOUSE IW04037G04 FLUE GAS 115/220V-AC INTERFACE PANEL ANALYZER B403137
ROSEMOUNT 1054A 1054ADO DISSOLVED OXYGEN ANALYZER 115V-AC B404818
YOKOGAWA PH400-P-U-1XA PH ANALYZER D466025
NEW ROSEMOUNT 190702 7003M PERCENT OXYGEN ANALYZER D451485
NEW FOXBORO 873PH-AIYFNZ-7 873 120V-AC PH/ORP 0-14PH MODULE ANALYZER B339502
NEW UNILOC 1002 0-14 PH METER ANALYZER D455865
ROSEMOUNT 1054AT TOROIDAL CONDUCTIVITY MICROPROCESSOR ANALYZER B325794
REMARK 4050 RS232 LINE BUS CONTROL TRANSFER BREAKOUT BOX ANALYZER B331117
GLI GREAT LAKES 671 115V-AC 0-12PH SCALED NEMA 4 CONDUCTIVITY ANALYZER B354468
TBI 601 SERIES 600 CONDUCTIVITY CONTROLLER ANALYZER B336726
FOXBORO 873 SERIES ELECTRODELESS CONDUCTIVITY ANALYZER D493822
FOXBORO 873 120V ELECTRODELESS CONDUCTIVITY ANALYZER B436342
LEEDS NORTHRUP 7082-16 120/240V-AC 15VA CONDUCTIVITY ANALYZER B469046
ROSEMOUNT 1054BC-02 CONDUCTIVITY MICROPROCESSOR 115/230V-AC 4W ANALYZER D497897
SPM INSTRUMENT BEA-52 BEARING ANALYZER D492688
GREAT LAKES 95 115V-AC 60HZ TURBIDITY ANALYZER D299324
GREAT LAKES 95 115V-AC 60HZ TURBIDITY ANALYZER D299320
BAILEY TB600 SERIES TBI CONTROLS PH INSTRUMENT ANALYZER B408028
NEW ROSEMOUNT 1054BPH-02 1054B 115/230V-AC PH/ORP ANALYZER D435765
FOXBORO 873EC-AIPFGZ ELECTRO CHEMICAL 120V-AC 0-50MS/CM ANALYZER B318836
EUR-CONTROL DRT-90 SEQUENCE CONTROL SERVICE REFINING MODULE ANALYZER B395432
TELEDYNE 322B MULTI CHANNEL OXYGEN MONITOR MODULE 0-25% ANALYZER B325342
TELEDYNE 323-04494-0044 OXYGEN MONITOR MODULE 0-25% ANALYZER B425174
TBI CONTROLS SERIES 600 PH 120V-AC INSTRUMENT ANALYZER B408037
ROSEMOUNT 1054AC 115V-AC ANALYTICAL CONDUCTIVITY ANALYZER D498199
ROSEMOUNT1054A 1054ADO DISSOLVED OXYGEN ANALYZER 60HZ 0.100A 115/230V-AC B221515
LXE 9200L08 115V-AC 35V-DC BATTERY CHARGER ANALYZER B417581
GLI GREAT LAKES 671 14PH DIGITAL CONDUCTIVITY ANALYZER 115V-AC B354459
ROSEMOUNT 1054BC-02 1054B CONDUCTIVITY MICROPROCESSOR 230V-AC ANALYZER B341500
FOXBORO 873EC-AIZFNZ 873 120V ELECTRODELESS CONDUCTIVITY ANALYZER B418495
TBI TB411 BAILEY MULTI RANGE CONDUCTIVITY 90HZ ANALYZER B329830
ABB BIAC-1000 TMP CONSISTENCY 230VAC 100W 50-60HZ ANALYZER B243463
ROSEMOUNT 1054AC MICROPROCESSOR CONDUCTIVITY MODULE ANALYZER B332781
TBI TB600 BAILEY CONDUCTIVITY SERIES 600 INSTRUMENT ANALYZER B327021
BAMBECK O2000 OXYGEN ANALYZER 115V AC D236098
ROSEMOUNT 1054AC 1054A MICROPROCESSOR CONDUCTIVITY MODULE ANALYZER B353417
BAILEY ICCS02100 免费信息BUSTION CONTROL SYSTEM ANALYZER 120V-AC B216785
ROSEMOUNT 1054AC 1054A MICROPROCESSOR CONDUCTIVITY MODULE ANALYZER B338694
MICRO MOTION DRT1RS1C DIGITAL RATE TOTALIZER 115V-AC 25W ANALYZER D501612
VTI MB-300G GRAVIMETRIC VAPOR SORPTION ANALYZER B432661
ILLINOIS INSTRUMENTS 810 OXYGEN ANALYZER D477519
THERMO ENVIRONMENTAL 143 FLOW PERMEATION CALIBRATOR ANALYZER D489905
ORION 710A PH/ISE IONALYZER METER DIGITAL INSTRUMENT ANALYZER D511022
ROSEMOUNT 54EC-01 CONDUCTIVITY RESISTIVITY 230V-AC 8W ANALYZER B334829
LEEDS NORTHRUP 7082-16 120/240V-AC 15VA CONDUCTIVITY ANALYZER B472284
NEW APC 0L232 SMART-UPS POWER SUPPLY LIT KIT BACKUP UPS D454246
NEW APC SURTA3000XL SMART-UPS 2100W 120V-AC BACKUP UPS D512008
NEW INTERMEC 203-788-002 CV60 SMART-UPS BACKUP UPS D380926
APC BP280S BACK-UPS PRO 280 180W 120V-AC 7A AMP BACKUP UPS D448767
UPS SYSTEM INC GES 425V 425VA 100-200V-AC 120V-AC 6A AMP BACKUP UPS B379502
BEST POWER 03050600U PATRIOT 600 120V-AC 12V-DC 400W BACKUP UPS D468484
APC SU1000信息发布 SMART-UPS 1000VA 120V-AC 12A AMP BACKUP UPS B425992
NEW ONLINE POWER LU1.6A01HFN1-20 1900VA 120V-AC 11A 96V-DC BACKUP UPS D453282
ABB 6222NP10100A-73?8 TAYLOR POWER SUPPLY RACK BACKUP UPS D383964
SOLA 0310-0400 U INTERRUPTIBLE POWER SUPPLY 400VA 110-120V-AC BACKUP UPS B487726
APC SU700RM2U SMART-UPS 700 450W 120V-AC BACKUP UPS D494189
APC BK300 180W 120V-AC 120V-AC 3A AMP BACKUP UPS B305443
SOLA 056-10001-7500-?01 MINI UPS UNINTERRUPTIBLE POWER SUPPLY BACKUP UPS D468512
APC SU1000信息发布 SMART-UPS 1000VA 120V-AC 12A AMP BACKUP UPS B426017
NEW SWAGELOK S-63TF8 1/2 IN NPT STEEL THREADED BALL VALVE D513011
NEW WKW B136-S8-43-S2 3000MOP CF8M 1IN NPT STAINLESS FLOATING BALL VALVE D410534
NEW APOLLO 70-104-01 3/4 IN NPT BRONZE THREADED BALL VALVE D410560
NEW WHITEY B-41S2 1/8 IN BRASS BALL VALVE D430679
NIBCO T-FP600 1/2 IN NPT 600 THREADED BALL VALVE B442235
NEW APOLLO 1/2 IN 1000 STAINLESS SOCKET WELD BALL VALVE B414883
WHITEY SS-45S8 2 WAY 1/2 IN STAINLESS THREADED BALL VALVE D432723
NEW FNW 2000W0G 1/4 IN NPT STAINLESS THREADED BALL VALVE D456730
NEW WORCESTER CONTROLS 4466TSE FLOWSERVE 3/8 IN NPT STAINLESS BALL VALVE D408910
NEW SFERACO 505100 VS 505 DN 100 FTE PN16 4 IN STEEL FLANGED BALL VALVE D451056
NEW HAWS SP230 W/ FLAG THREADED 1/2X3/8 IN NPT BALL VALVE D357567
NEW VALVTECHNOLOGIE?S BOL1-SW-STD 3/4 IN SOCKET WELD STEEL BALL VALVE D515716
JAMESBURY 4 A 150F 36 4 IN 150 STEEL FLANGED BALL VALVE D394592
NEW FNW 601-150 2-1/2 IN 150 STEEL FLANGED BALL VALVE D404625
NEW HAWS SP227 DRINKING FOUNTAIN STAINLESS 1/2X3/8IN NPT BALL VALVE D328574
NEW PROCOL 20 1/2 IN 3 PIECE STAINLESS SOCKET WELD BALL VALVE B406529
NEW VALVTECHNOLOGIE?S BOL1-SW-STD 1/2 IN SOCKET WELD STEEL BALL VALVE D515721
NEW APOLLO 80-107-01 1-1/2 IN NPT BRASS THREADED BALL VALVE D410187
NEW CW617N THREADED 1/2IN NPT BALL VALVE D348066
JAMESBURY 4 IN 150 STEEL FLANGED BALL VALVE D471786
NEW RED-WHITE 4880 2000WOG 2WAY STAINLESS 1-1/2 IN NPT BALL VALVE B332077
NEW KARL DUNGS M601 BRONZE THREADED 3/8 IN NPT BALL VALVE D356858
FNW 1500WOG CF8M STAINLESS THREADED 1-1/4 IN NPT BALL VALVE D365184
NEW WATTS 0824 BRONZE THREADED 1/4IN NPT BALL VALVE D342242
NEW WORCESTER 1/2 WK4466TTC R1 1/2 IN STAINLESS TRI-CLAMP BALL VALVE D447199
MAS G-3 1000WOG CF8M 1/2 IN STAINLESS SOCKET WELD BALL VALVE B480593
NEW FLUID TRANSFER 2FT 3/4IN 300 SANITARY STAINLESS BALL VALVE D416983
MAS G-3 1500WOG CF8M 1-1/2 IN STAINLESS SOCKET WELD BALL VALVE B458958
VELAN S08-K1813-SSG 1000WOG CF8M 2 IN PNEUMATIC BALL VALVE B389779
NEW MAS 0206 3/4 IN NPT 2000 STAINLESS THREADED BALL VALVE B416119
NEW JOMAR T-100N-E GAS SHUT OFF 150 BRONZE 1-1/2IN NPT BALL VALVE D353376
WATTS S8450-M1-04 300WSP STEAM VALVE 1/2 IN NPT STAINLESS BALL VALVE B406637
FLOW-TEK H.65418 S.3000 STEEL THREADED 1-1/2IN NPT BALL VALVE D257312
NEW FLUID TRANSFER 免费信息PANY 2FT 3/4 IN 300 STAINLESS TRI-CLAMP BALL VALVE D435289
NEW FLUTEC KHMG1/23312 3/4 IN BALL VALVE B298022
HILLS MCCANNA RAMCON F151-S6-T 3/8 IN NPT STEEL FLANGED BALL VALVE D463431
GRINNELL BVR HINDLE 3X2-1/2 IN 150 STAINLESS FLANGED BALL VALVE D445891
NEW CONBRACO APOLLO 3/4 IN NPT BRASS THREADED BALL VALVE D482422
NEW 1/2 IN NPT BRASS THREADED BALL VALVE D503963
NEW SANITARY 1 IN PNEUMATIC STAINLESS TRI-CLAMP BALL VALVE D434963
TRUELINE 1000WOG 1/2 IN NPT PNEUMATIC STAINLESS THREADED BALL VALVE D447225
NEW RUB S95 BRONZE THREADED 1-1/2 IN NPT BALL VALVE D246359
NEW GMR CARBON 500SF 1-1/4 IN STEEL SOCKET WELD BALL VALVE B427858
NEW FG INOX E51AB FX 4 IN STAINLESS FLANGED BALL VALVE D445938
VELAN 8 BOLT CLASS CF8M 150 STAINLESS FLANGED 4 IN BALL VALVE B249385
NEW MCCANNA S302-BR-R-S6 BRONZE THREADED 3/4IN NPT BALL VALVE D357368
NEW MAS G-3 1500WOG 1001 CF8M STAINLESS SOCKET WELD 1-1/2IN BALL VALVE 200478
NEW GMR 500ISF 3/8 IN STAINLESS SOCKET WELD BALL VALVE B429215
NEW INLINE INDUSTRIES P1204107 MODEL 304F STAINLESS 3/4IN BALL VALVE D311002
APOLLO 316 1/2 IN NPT 2000WOG STAINLESS THREADED BALL VALVE B398566
NAQIP 1000 WOG CF8M 2 IN STAINLESS BALL VALVE B465438
NEW PROCOL DN 20/15 PN 125 CF8M 5/8 IN STAINLESS BUTT WELD BALL VALVE B424456
JAMESBURY 3AZ150F36 150 STEEL FLANGED 3 IN NPT BALL VALVE D351633
FNW CF8M 1000 WOG STAINLESS 3-1/2 IN SOCKET WELD BALL VALVE B311774
NEW DYNAQUIP 1-4408 PN64 1000 STAINLESS SOCKET WELD 1 IN NPT BALL VALVE D355748
NEW WATTS B6780 3/8IN NPT BRONZE THREADED BALL VALVE D417695
NEW PARKER 12Z-B8LJ2-SSP 3/4 IN STEEL BALL VALVE D453607
NUTRON T3-F15S20A 1-1/2 IN NPT STAINLESS THREADED BALL VALVE D427314
DURCO AKH3 PNEUMATIC 150 STEEL FLANGED 2 IN BALL VALVE B208412
NEW FLUID TRANSFER 免费信息PANY 2FT 3/4 IN 300 STAINLESS TRI-CLAMP BALL VALVE D435288
KITZ 150UTBM 275PSIG 150 STAINLESS FLANGED 1/2 IN BALL VALVE B206432
LOT 2 LUBRIQUIP 509-365-030 1/4 IN NPT STEEL THREADED BALL VALVE D473552
NEW VELAN 00302-SSEAE 2X3 IN 150 STEEL FLANGED BALL VALVE B473680
NEW 3/4 IN NPT STAINLESS THREADED BALL VALVE D496371
NEW DYNAQUIP 3/8 VGA2-A3 125WOG SEAT 3/8IN NPT 2000WOG BRONZE BALL VALVE B398018
NEW NEUHAUS NEOTEC PKI-1/2-I-NPT-0?15-D058 SC-M2-S1 1/2IN NPT BALL VALVE D303841
NEW JENKINS BRS125G 600WOG 2 WAY BRASS THREADED 1-1/2 IN BALL VALVE B330423
NEW ASAHI DUO BLOC SOCKET TRUE union 1/2 IN 150 BALL VALVE D480500
TRUELINE N650T CF8M 1000WOG STAINLESS 2 IN BALL VALVE B348052
JAMESBURY 3A-3600TT-3 VPVL050SR6B 1/2IN NPT PNEUMATIC THREADED BALLVALVE B449137
NEW SUPERIOR 594A-255T COPPER PIPE BRASS SOCKET WELD 2-1/2IN BALL VALVE D315729
NEW GEb2b FISCHER 198.150.778 WITH ACTUATOR 1IN PVC BALL VALVE D346315
NEW GMR EMICO 500SF CARBON STEEL SOCKET WELD 3/4IN BALL VALVE B201786
NEW VALVTECHNOLOGIE?S B0L1-SW-STD 1/2IN STEEL SOCKET WELD 3100 BALL VALVE D515655
MAS CF8M 1/4 IN NPT 2000WOG STAINLESS THREADED BALL VALVE B402309
KF VALVES 3 IN 150 STEEL FLANGED WEDGE GATE VALVE D446837
NEW NELES JAMESBURY 1/2 23 2236 TT1 800CWP 1/2 IN NPT STEEL BALL VALVE D479701
NEW FNW 601-150 2-1/2IN FLANGED 150 STEEL BALL VALVE D403483
WHITEY SS-45S8 2 WAY 2500PSI 1/2 IN NPT STAINLESS THREADED BALL VALVE D431036
NEW WORCESTER MK001 1/2 IN STEEL SOCKET WELD BALL VALVE ASSEMBLY D458876
NEW MCCANNA 57126DRT E325 FLOWSERVE 3/4 IN STEEL BALL VALVE D513595
WHITEY SS-62TSW6T 3600PSI 3/8IN NPT STAINLESS SOCKET WELD BALL VALVE B406717
JAMESBURY QP1C/M QUADRA-POWR II 100PSI DIAPHRAGM 1-1/2 IN BALL VALVE B445761
APOLLO CII 1-1/2 IN NPT 400 BRONZE BALL VALVE B415245
NEW ASAHI DUO BLOC PVDF 1 IN SOCKET WELD BALL VALVE D476877
NEW PITTSBURGH BRASS PS-60 2 IN PNEUMATIC 150 STEEL FLANGED BALL VALVE D480022
TRI CLOVER SANITARY DISC BODY CG3M 1 IN STAINLESS FLANGED BALL VALVE B454677
NEW WHITEY B-65TF12 3/4IN NPT BRASS THREADED BALL VALVE D413559
NEW MCCANNA MARPAC 571MJHRT 2CSE32512RTP-T1 2 IN 2000 STEEL BALL VALVE D514225
TA CHEN TC-03S 1000 WOG FLOW 3/4 IN STAINLESS SOCKET WELD BALL VALVE B480587
NEW WORCESTER CONTROLS 4466TSE FLOWSERVE 1/4 IN NPT STAINLESS BALL VALVE D410113
MARWIN 5333R 4 IN 150 STAINLESS FLANGED BALL VALVE D471743
FLOW-TEK H.65418 S.3000 STEEL THREADED 1-1/2IN NPT BALL VALVE D257312
NEW PARKER 6Z-SWB4L-RT-BN-?SS-S-LD 2500CWP 9MM STAINLESS BALL VALVE D514117
NEW FG INOX HC91KDJ 4 IN STAINLESS FLANGED BALL VALVE D445935
APOLLO CII 2 WAY 600WOG BRASS THREADED 1-1/2 IN BALL VALVE B265200
