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PLC输入输出模块是PLC与工业现场设备之间的核心连接桥梁，负责完成信号的双向转换与传输，是自动化控制系统里的关键组成部分。

一、核心作用

二、主流分类

按照信号类型和功能，可分为四大基础类别：

1. ‌数字量输入模块‌：接收开关通断类的二进制信号，常见支持24V DC或220V AC输入，适配按钮、行程开关等设备。

2. ‌数字量输出模块‌：分为继电器型、晶体管型、晶闸管型三类：

3. 继电器型：可驱动250V/2A交流负载，适合接触器、电磁阀等设备，机械寿命约10万次。

4. 晶体管型：响应速度可达0.1毫秒级，仅支持30V以下直流负载，适配高频脉冲控制场景。

5. 晶闸管型：专为220V交流负载设计，无火花通断，适合加热管、交流电机控制。

6. ‌模拟量输入模块‌：采集温度、压力等连续变化的物理量，支持4-20mA、0-10V、热电阻、热电偶等信号格式。

7. ‌模拟量输出模块‌：输出连续的电压/电流信号，用于控制变频器、比例调节阀等需要无级调节的设备。

HONEYWELL MICRO SWITCH 221CH54 RB Roller Action Limit Switch9

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WESTINGHOUSE CUTLER HAMMER HFB3480ML 3 Pole 50 AMP 160-480 TripCircuit Breaker

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ACCU CODER W275379 Encoder 220C 0100PU 0003

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Cutler Hammer C370MCP size 00 starter 3amp motor circuitprotector

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SIEMENS MEANWELL DRP 480 24 Switching Regulator Power SupplyIFSM568629

WESTINGHOUSE Motor Circuit Protector MCP13300

ALLEN BRADLEY CUTLER HAMMER EATON 140U K SNB 480-600V Shunt Trip1482D59G04

CUTLER HAMMER WESTINGHOUSE WPONI W 200 Advantage PONI 96002D79735G04

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CINCINNATI ELECTROSYSTEMS Model 416 Control and Display Module416 4 5 5 11

GROUPE SCHNEIDER MODICONUE 24VDC 16W Power SupplyTSXPSY1610

EDWARDS 2025 X704 Fire Ala

DWYER FLOWTECH W.E. ANDERSON Model V6EPB Flow Switch SS4FS

Bussmann CHM3DI 4 Bases Modulares Industriales 690v-32amp

GOULD FERRAZ SHAWMUT Copper Distribution Block 68182 2 pole600V

ALLEN BRADLEY 592 D0V16 Overload Relay Panel Mount

Cutler Hammer Westinghouse A200 Size 5 Coil 208/220/240 VAC2050A14G10

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Schneider Electric TSXDEY32D2K Sink Connector Module

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GE FANUC IC697MEM713C 64 KB CMOS Memory Expansion Module

GE Timer and Relay Assembly CR122BT 02022A

GENERAL ELECTRIC GE FANUC Operator Interface ProgrammerIC620ACC003A

CUTLER HAMMER WESTINGHOUSE ART ON 30 Second Timing Relay

Westinghouse addressable relay ARII model B 5302C07G02

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ALLEN BRADLEY 2711 NM3 Panel View 1200 EEPROM Memory Upgrade KitModule

PYOTT BOONE 004 0053 001 Model 271 Remote Locator with Keys

Delta DOP EXIO28RAE 5VDC 100Ma HMI Human Interface Module

SIEMENS 958LGB3SA ESP200 25-100 AMP Electronic Overload Relay3UB8J33 6GWZ

WESTINGHOUSE Micro Switch Assembly 6A for 240V-600V Shunt Trip1371D11G32

WESTINGHOUSE CUTLER HAMMER HTM OG Mor Relay Current RatingModule S#1D89108G43

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SYLVANIA JOSLYN CLARK CMC 778M KTM33 1 Size 3 Contact Kit 3Pole

Westinghouse Cutler Hammer M33 6VH Rev Vacuum ContactorInterlock Kit 180C113G17

WESTINGHOUSE CUTLER HAMMER DPC Coil 110/120VAC 1254C70G08

Allen Bradley Input Module 1741 A120A Series A

Allen Bradley 1745 M1 Memory Module Series B

Allen Bradley 1336-MOD-E1 Programming Terminal 12V Series A

Allen Bradley 160-BA03NPS1 series C 0.75KW/1HP

Allen Bradley 140142 Rectifier Bridge

EATON R9I3030FCC 30 AMP I Frame Fusible Rotary Disconnect600VAC

ALLEN BRADLEY 140U H ER1 600VAC 125VDC Auxiliary Ala

EATON CUTLER HAMMER MA1L1RPK F Frame Ala

EATON CUTLER HAMMER SNT3P18K K Breaker 480-600 VAC Shunt Trip6642C88G04

EATON CUTLER HAMMER A2X1RA 2A-2B F Frame Ala

EATON CUTLER HAMMER UVH3RP23K K Frame UVR Undervoltage Release1482D05G33

WESTINGHOUSE A200 Size 2 Contact Kit 3 Pole 373B331G12

ALLEN BRADLEY 140U H SND E J L Breaker Shunt 66C1571G65SNT120CPK 66C1571G45

EATON CUTLER HAMMER RP6A16A080 Rated RMS R Rating Plug RetroPlug 3D86766G23

FASTENAL E Model 0547658 HAND CHAIN Hoist .5 Ton 1/2 TON10' Chain

EATON CUTLER HAMMER W22 Advantage Auxiliary Contact 2 NO 2 NC1A48174G07

EATON CUTLER HAMMER SNT120CPK Type E J L Breaker Shunt Trip66C1571G45

COOPER ARROW HART AH420MI12W 20 AMP 125/250 VAC 65420Switched

DWYER WMT2 A C 06 10 Liquid Flow Meter US GALLONS 1 1/2" 6 Digitx 100 Water

EATON MOELLER NZMB1 S26 CNA 3 Pole 26AMP 690VAC NZM 1 CircuitBreaker

EATON CUTLER HAMMER DR3016UGRY 3 Pole 16 AMP Rotary SwitchDisconnect Nema 1

CROUSE HINDS 7565-D Circuit Breaking Receptacle 7565 D 3Wire

EATON CUTLER HAMMER ECL03B1A4A Electrically Held 20AMP 4PoleLighting Contactor

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LUTRON CHD0 96W24V U HOMEWORKS LED Power Supply Driver Input120-277 VAC Output

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SCNEIDER ELECTRIC LV432619 NSX400 TO 630 TRANSFERPACT DownstreamBusbar Coupling

CUTLER HAMMER WESTINGHOUSE HFB3022ML 3 Pole 3 AMP Type HFB MagONLY

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ALLEN BRADLEY 509 M/A78282 110 120 VAC Size 0 Starter 18 AMPElectronic Overload

GIDDINGS & LEWIS NSM2304 401 30235 01

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MICRO POWER BERG 3015 00 0031 SMC HF 24/8 SB50 Plug Type 115 VAC924212 526

EDWARDS Adaptabel 340 10N5 Vibrations Bell 120 VAC 10 InchAudible Signal

TENSE KON TER 25 Termik Kontaktor Overload Contactor Relay100-240 VAC 1-25 AMP

INTERTEK NGRK 300W RUGGED GRADE E39 LED Shoebox Retrofit LightKit 300 Watt 100

EATON CUTLER HAMMER EDB3110 Type EDB Circuit Breaker 3 Pole 110Amp

Delta DTB9696LVE 100-240V Temperature Controller

Delta DTB9696CVE 100-240V Temperature Controller

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SIEMENS CLM0C02 AC Lighting Contactor 2 Pole 30 AMP 120 VAC

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ALLEN BRADLEY 160 BA03NSF1 160 SSC 1 HP Drive 380-460 VAC

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CUTLER HAMMER WESTINGHOUSE A200 A201 Size 5 440 480 VAC Coil2050A14G15

EATON CUTLER HAMMER CN15DNY13AB 110 120V CN15 65mm Enhanced CoilContactor 27AMP

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EATON CUTLER HAMMER HMCPS015E0C HMCPS Motor Circuit Protector 3Pole 15 AMP

BMI 14312 BRASS Check Valve 4" 200 WOG 4 Inch IPS

OGDEN ETR 9300 411000 Temperature Controller Relay ETR-930090-264 VAC

BOX CASE OF 10 LEGRAND Radiant 1597I GFCI Ground FaultReceptacle Self Test

CASE OF 10 PASS SEYMOUR Legrand 1595 TRWRLA GFCI Duplex GroundFault Receptacle

MEANWELL BTC POWER 202 0128 01 HVG 480 24A AC/DC Switching PowerSupply 200-480V

EATON CUTLER HAMMER GPS3035 3 Pole 35 AMP Type GPS CircuitBreaker

EATON XTFC010BBA 120 VAC CMC Type F FVRN 6.3 - 10 AMP StarterManual Operator

BOX OF 10 HUBBELL GFTWRST20BKU 20 AMP Commercial Grade GFCIReceptacle BLACK

WAGO 750 852 PLC Ethernet Controller 100MBIT 2 Port 1001507758750-852

COOPER POWER 27KV MOV Arrester 27 KV VariGap HD UHG27

ABB FEIP 21 Ethernet IP Adapter MODULE OPTION SP KIT FEIP-21DRIVE INVERTER