福建中立恒自动化设备有限公司

1．输入/输出单元

输入/输出单元通常也称I/O单元或I/O模块，是PLC与工业生产现场之间的连接部件。

PLC通过输入接口可以检测被控对象的各种数据，以这些数据作为PLC对被控制对象进行控制的依据；同时PLC又通过输出接口将处理结果送给被控制对象，以实现控制目的。

由于外部输入设备和输出设备所需的信号电平是多种多样的，而PLC内部CPU的处理的信息只能是标准电平，所以I/O接口要实现这种转换。

I/O接口一般都具有光电隔离和滤波功能，以提高PLC的抗干扰能力。另外，I/O接口上通常还有状态指示，工作状况直观，便于维护。

PLC提供了多种操作电平和驱动能力的I/O接口，有各种各样功能的I/O接口供用户选用。I/O接口的主要类型有：数字量（开关量）输入、数字量（开关量）输出、模拟量输入、模拟量输出等。

常用的开关量输入接口按其使用的电源不同有三种类型：直流输入接口、交流输入接口和交/直流输入接口。

常用的开关量输出接口按输出开关器件不同有三种类型：是继电器输出、晶体管输出和双向晶闸管输出。

继电器输出接口可驱动交流或直流负载，但其响应时间长，动作频率低；而晶体管输出和双向晶闸管输出接口的响应速度快，动作频率高，但前者只能用于驱动直流负载，后者只能用于交流负载。

PLC的I/O接口所能接受的输入信号个数和输出信号个数称为PLC输入/输出（I/O）点数。I/O点数是选择PLC的重要依据之一。当系统的I/O点数不够时，可通过PLC的I/O扩展接口对系统进行扩展。

2．通信接口

PLC配有各种通信接口，这些通信接口一般都带有通信处理器。

PLC通过这些通信接口可与监视器、打印机、其它PLC、计算机等设备实现通信。

PLC与打印机连接，可将过程信息、系统参数等输出打印；与监视器连接，可将控制过程图像显示出来；与其它PLC连接，可组成多机系统或连成网络，实现更大规模控制。

与计算机连接，可组成多级分布式控制系统，实现控制与管理相结合。远程I/O系统也必须配备相应的通信接口模块。

3．智能接口模块

智能接口模块是一独立的计算机系统，它有自己的CPU、系统程序、存储器以及与PLC系统总线相连的接口。

它作为PLC系统的一个模块，通过总线与PLC相连，进行数据交换，并在PLC的协调管理下独立地进行工作。

PLC的智能接口模块种类很多，如：高速计数模块、闭环控制模块、运动控制模块、中断控制模块等。

以下链接皆有货

F8203802 SEAL ALLIANCE SPEED QUEEN LOT OF 12

9-14213612-0 ISUZU KOMATSU GASKET LOT OF 10

8247866 SEAL ELECTRO-MOTIVE EMD

12-00306-00 CARRIER SENSOR REPLACE 12-01090-00

91040380 O-RING KIT REPAIR

1-8466060 ELECTRO MOTIVE PINION GEAR EMD 8466060

314-013 PUSHBUTTON RESET FOR VSM 300 SHALE SHAKER 300/03/16

785292-4 HOBART TEMPERATURE PROBE SENSOR

VCBT2500000 MECHANICAL SEAL

BE321620GEK BASLER TRANSFORMER

195-202-0350 FITS HOSHIZAKI 195-202-0350 CAPACITOR 20UF 350V AC50/60HZ

65720255 CRANK CASE OIL SEAL FOR CAT TRIPLEX PUMP QTY 3 PCS

100003329 REPAIR KIT 4WAY VALVE TORQ POWER CANSOLE

M4960P3 DRYER KIT TRUNNION AND SEAL 35/T30 ALLINCE

VENTIS MX4 GAS DETECTOR CHARGER

PK252HLL01 PARKER PISTON SEAL KIT

CS0177292 BREMAS ROTARY CAM SWITCH

00-107477 GASKET-HINGE HOBART 107477 4

002404483 EMERSON GS-2136-1 SOLENOID COIL 208/240 50-60

20070-039 WARTSILA O RING

450014 TAIYO ELECTRIC 150V SPACE HEATER ELEMENT EA 300 W

P77BCA-9300 JOHNSON CONTROLS PRESSURE SWITCH

XHPBS 20123 ADALET EXPLOSION PROOF PUSHBUTTON GREEN

D-A93 SMC CORPORATION REED SWITCH LOT OF 8

D-A93 SMC CORPORATION REED SWITCH LOT OF 8

XHPBM ADALET PUSHBUTTON

5H-7704 CATERPILLAR ORING 5H7704 LOT OF 16

5H-7704 CATERPILLAR ORING 5H7704 LOT OF 16

7D-1979 CATERPILLAR O-RING 7D1979 4

3N5991 CATERPILLAR IMMERSION THERMOCOUPLE

4F-7387 CATERPILLAR ORING 4F7387 8

8F-8858 BUTTON CATERPILLAR 8F8858 4

5N-8209 HARNESS CATERPILLAR 5N8209

3P-0653 SEAL ORING CATERPILLAR 3P0653 LOT OF 13

PWB 9200-3128 ECOLAB PCB

2P-9540 SEAL CATERPILLAR 2P9540

ETA 2210-S210-P1M1-H121 CIRCUIT BREAKER PLUG IN

782XBXM4L MAGNECRAFT RELAY 24VAC LOT OF 6

782XBXM4L MAGNECRAFT RELAY 24VAC LOT OF 6

FURUNO IC-315 JUNCTION  MADE IN JAPAN

98054-2 COUPLING FOR NOV VARCO TDS OIL PUMP L095118

0423-2267 SHAFT SEAL DEUTZ 04232267

5H401002 BEARING CONNECTING ROD

XB4BP42 SCHNEIDER ELECTRIC PUSHBUTTON RED

6N-7363 SEAL KIT CATERPILLAR 6N7363

6N-7533 ROTOR VANE KIT CATERPILLAR 6N7533

UK 5-HESI PHOENIX CONTACT FUSE MODULAR TERMINAL BLOCK 2

3P-0658 ORING CATERPILLAR 3P0658

2110658 PIN FOR 1625-UDBE DISC BRAKE NATIONAL OILWELL VARCO

DIFFUSER HER SEWAGE TREATMENT PLANT MODEL ST6A

51464 SEAL INGERSOLL RAND FOR FA5MR AIR HOIST MAN RIDER S-12797 SEAL PACK OF 2

EM 95 SERIES LIMIT SWITCHES

RV1607B STAUFF HIGH PRESSURE CHECK VALVES PN500-1 MADE IN GERMANY

35332691 SPRING DOOSAN INGERSOLL RAND

INGERSOLL RAND CAPSCREW 71431571 LOT OF 8

26966 INGERSOLL RAND SPRING

582495-80 ASCO SOLENOID VALVES

E2E2-X5C1 OMRON LONG-BARREL INDUCTIVE PROXIMITY SENSOR

4004406 NOV SHAFFER PRESSURE GAUGE 0-300 PSI 1/4" NPT DSC600K

15003 NON RETURN VALVE YORK MADE IN ITALY

QUINCY 2012100202 KIT AIR DIAPHRAGM 6353

APPLETON GRX100 4 WAY EXPLOSION PROOF CONDUIT OUTLET  

3EB-30-11131 KOMATSU FORKLIFT BRAKE CABLE PARKING BRAKE CABLE

6680 FESTO GATE AND

OSYSU-2 SUPERVISORY SWITCH

00-975632 MECHANICAL SEAL 7/8" HOBART 54302

GB2CB12 SCHNEIDER  TELEMECANIQUE CIRCUIT BREAKER

723M1055001 MECHANICAL SEALS

30172885-SK GASKET RETURN FILTER FOR IRON ROUGHNECK ST-80

P302-6 SIRAI PRESSURE SWITCH

5N-3810 CATERPILLAR GASKET 5N3810

3S-9643 LIP SEAL CATERPILLAR 3S9643 LOT OF 8

PT1000 DANFOSS TEMPERATURE SENSOR

WATTS P60 WATER PRESSURE REGULATOR P60-0-25PSIG 1037885

B3.30 - SQUARE D - OVERLOAD RELAY THERMAL UNIT

BA-0051 PACKING STEM 1-1/4" 2039123480 RG SEAL NOV

B-10K PARTS KIT FOR EB-0107 SPRAY VALVES TS BRASS

US2112B UNICATCH 21 GAUGE 1/2 CROWN 80 SERIES STAPLER

204366 J CLIPPER SEAL KIT

6S-1025 JOINT CATERPILLAR 6S1025

5P-8970 SINGLE CYLINDER LINER GASKET KIT CATERPILLAR 5P8970

BX155 RING GASKET SS316

SEA TEL 122176 HARDWARE KIT XX97 PULLEY REPLACEMENT HARDWARE KIT

RX35 RING GASKET SS316 PETRO FLEX

SP-2300 HT PACKING ASSEMBLY 4"-10K MAGNUM HIGH TEMP SP-2300 HT

3P-0649 SEAL ORING CATERPILLAR 3P0649 LOT OF 8

6125-16 PARKER CONNECT UNDER PRESSURE, HIGH FLOW QUICK COUPLINGS

53157 SEAL KIT BRADEN/PACCAR 72911

BRADEN A11112X SEAL KIT BRADENPACCAR 71042

0664-4800 HELLE RELAY BOARD 344C2

INX4000SP LAMP HER SHOCKPROOF PAULUHN ELECTRIC INX4000

APOLLO BALL VALVE 1/2" REPAIR KIT 2710327-03-09/2710327-27/2710327-30

66623338450 NORTON BACK UP PAD 15H.516M8  PCS

761069238 GEORG FISCHER ELECTROFUSION ELBOW 90° D20

2.04.5 BOLL  KIRCH FILTER 2.04.5/DN32

V9NL SAIA-BURGESS MICROSWITCH

8UC61 SIEMENS HANDLE

2N-2765 BOLT-HIGH TEMPERATURE CATERPILLAR 2N2765 LOT OF 6

7B-2420 FERRULE CATERPILLAR 7B2420 5

480303 EXTECH 3 PHASE  MOTOR ROTATION TESTER

480303 EXTECH 3 PHASE  MOTOR ROTATION TESTER

246-8458 AMPHENOL CONNECTOR 6 WAY LOT OF 6

8UC6 SIEMENS FRONT DRIVE HANDLE

26 NISSENS BY-PASS VALVE 1"

K5W250 SPRING SPOOL VALVE FOR 25UWB114L INGERSOLL RAND

302505 OX HIGH PRESSURE CONNECTOR 1669430

30172475-44-28 BUSHING DP4 BUSHING FOR NOV VARCO ST-80 ROUGHNECK

648408359 MISSION SEAL OUT BOARD BEARING COVER MISSION MAGNUM PUMP

1TL1-2 HONEYWELL TOGGLE SWITCHES MS24523-21

05211600031000A SEQUENCE VALVE 1/2" REXROTH

05211600030500A SEQUENCE VALVE REXROTH

FX4042 PAULUHN LAMP HER 13 W LAMP CROUSE-HINDS PAULUHN LOT OF 9

DIXON AIR KING A4 PLATED IRON CLAMP 1/2" DIAMETER LOT OF 12

40035242 (40036607) CYLINDER TEST VALVE EMD ELECTRO-MOTIVE

3018924 CUMMINS GROUND WIRE LOT OF 8

02909501 VETCO GLAND PISTON REGAN DIVERTER MODEL KFDH

FRP95566 WILKERSON FILTER REPLACEMENT FRP-95-566

214617 CUMMINS TUBE CLAMP LOT OF 6

3033915 CUMMINS SEAL O RING LOT OF 17

6V-3736 TURBOCHARGER INSTALL GASKET KIT CATERPILLAR 6V3736

3897787 CUMMINS O-RING SEAL LOT OF 6

349-822 RS RESISTANCE SENSING RELAY 50-5000 OHMS

116703001 ROD END BALL JOINT WEATHERFORD 14.5-50 HYD POWER TONG

4N4403 CATERPILLAR PISTON RING SPRING

8420863 VALVE SPRING-MAIN EMD ELECTRO-MOTIVE DIESEL

9571921 BUSHING ARM EMD ELECTRO-MOTIVE DIESEL LOT OF 6

8F-9206 SEAL ORING CATERPILLAR 8F9206 LOT OF 95

K5B-928 AIR MOTOR GASKET INGERSOLL RAND (FA5A, FA5I, FA5T) LOT OF 12

4L-7890 GASKET CATERPILLAR 4L7890 LOT OF 16

920-0001B JABSCO IMPELLER

G057 JOINT KIT IMO PUMP FERRIER PUMPS

150LF-12A END PLATE INGERSOLL RAND