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 PLC的外部设备主要是指控制系统中的输入输出设备，其中输人设备是对系统发出各种控制信号的主令电器，在编写控制程序时必须注意外部输入设备使用的是常开还是常闭触点，并以此为基础进行程序编制。否则易出现控制错误。

在PLC内部存储器中有于输入状态存储的输入继电器区，各输入设备（开关、按钮、行程开关或传感器信号）的状态经由输入接口电路存储在该区域内，每个输入继电器可存储一个输入设备状态。PLC中使用的"继电器"并非实体继电器，而是"软继电器"，可提供无数个常开、常闭触点用于编程。每个"软继电器"仅对应PLC存储单元中的一位（bit），该位状态为"1"，表示该"软继电器线圈"通电，则程序中所有该继电器的触点都动作。输入继电器作为PLC接收外部主令信号的器件，通过接线与外部输入设备相，其"线圈"状态只能由外部输入信号驱动。

郑娟萍

厦门仲鑫航自动化设备有限公司 

 PLC的各种功能主要是通过运行控制程序来实现。编制程序时，需要合理使用PLC提供的编程元件（即软元件）。FPO型PLC中常用的编程元件有两种：位元件（bit）和字元件（word）。位元件实际上是PLC内存区域所提供的一个二进制位单元，又被称为软继电器，主要用作基本顺序指令的编程元件，如输入继电器Xn、输出继电器Yn、内部通用继电器Rn、定时（计数）器等，其参与控制的方式主要是通过对应触点的通断状态改变影响逻辑运算结果即输出。

    字元件则为PLC内存区域内的一个字单元（16bit），主要用作功能指令和高级指令的编程元件，通常用以存放数据，如数据寄存器DTn，定时(计数)器的设定值SVn、经过值EVn等。字元件没有触点，通常以整体内容参与控制。

Banner PBD Power Block For Multi-Beam PBD 16390 New

NEW VEEDER ROOT 778311-121 PROXIMITY SWITCH 150mA

Rieter Proximity Switch 24V 18412170024024 0920-2328 09202328

NEW THERMOID 20MM TIMING BELT 1200 RPP8 1200RPP8

NEW HUNT & CO SWITCH CONTROL TO/6889 9400-FK  TO6889 9400FK

NEW DALTON SPRING TORQUE LIMITER 0SD-900 OSD900

KEB "KN" 16-083-25620 LIMIT ROLLER HEAD NEW 

Allen Bradley 195-BA01 Auxiliary Switch 195BA01 Ser. A

Parker SS14 & 40 Valve Kit PS5395 PS-5395 New

No Name Timing Belt T5-500 T5500 T5 500 New 

GOULD MODICON B552 10-48 VDC OUTPUT MODULE

Murr Elektronik Female Connector w/ Connector 7000-12321-6230500 New

NEW APPLETON EXPLOSION PROOF JUNCTION BOX GUB-1 GUB1

Johnson Controls Pressure Control Switch P70HA-2 P70HA2 40-100 PSIG New

RED LION LMPEC000 3 PIN LOGIC MAGNETIC PICKUP EMITTER FOLLER NEW 

Red Lion Inligent Meter IMP20060 120/240 VAC New

NEW RITTAL FLAT BRACKET ENCLOSURE CONNECTION KIT PS4582500 600347 

Fanuc LTD Discharge Unit A06B-6050-H050 A06B6050H050 Used

GE MOLDER MOLDED COVER ASSEMBLY 546A780G054 NEW

Giddings & Lewis DC Input 501-03202-00 502-02814-16

JOSLYN CLARK COIL TB-137-13 TB 137 13 TB13713 240V.D.C. 

PTC Dual 999018-001 Powerlithic Modules on Heat Sink 41180-002

SQUARE D 1S1F 1KVA 1 KVA 115C TYPE S 480/240 (HV) 240/120 (LV) 1PH TRANSFORMER

SQUARE D HCW 0199360-847 800A 800 A AMP 460V 3PH 3W BREAKER PANELBOARD

HERAEUS 834010 177 1750W 450V NEW PROCESS LAMP LIGHT 

LFE 2011 C5-5020-4300 PROCESS CONTROLLER  

No Name 274731 Heater 274-731 New

New D&R Lamps Miniature Lamp Bulb Model 259 Lot of 20 

NEW LOT OF 10 HALEX 90° LIQUID TIGHT CONNECTOR 16907B 3/4"

Acra Electric Heaters 4-92 175 watt 250 volt 10" x 3"

Allen Bradley Elect Interlock 40495-455-04 4049545504

IRION & VOSSELER ENCODER 112082-01 11208201 

SIRCO CHLORIDE POWER PROTECTION SWITCH VM1 125A 125A 125 A AMP 3 POLE  VM1125A 

Apollo Conbraco 1" 3 PC. Ball Valve Service Kit 82-005-01 8200501 Lot of 2 New

PARKER COIL  CF4C05 120V VOLT 04F20C2110ACF 11W WATTS 

Crouzet I/O Module IDC5Q 84112210 10-60 VDC 50mA Lot of 2 Used

DYNISCO TPT432A-5C-6/18 PRESSURE TRANSDUCER 0-500 PSI

New ACI Motor Brush Lot of 4 234 2-1/2" x 1"x 5/8"

NEW ALLEN BRADLEY DIODE AROUND KIT 142498 SEMIKRON RECTIFIER SKN71/12

METTLER TOLEDO MAIN INTERFACE DISPLAY CIRCUIT BOARD B140111 A12885800A 12885800A

(PACK OF 2) NO NAME 43884-0020 438840020 30VDC SURGE SUPPRESSOR NEW 

MURR ELEKTRONIK 21003-001 600 VOLTS 13 AMPS NEW

STI SCIENTIFIC TECH MINISAFE B LIGHT CURTAIN 36" RECEIVER MS4336B-2 MS4300B-2

STI miniSafe Light Curtain Receiver MS4312 New

NEW SENSORTRONICS LOAD CELL TEST SENSOR 60040-250-0103 600402500103

NEW LEVITON PULL CHAIN SWITCH 003-1689 0031689

FOXCONN CONTROL CONTROLLER DISPLAY PANEL 0-3598 GE C-2800 C1383-004

PPE Heat Band 66301-B 66301B 400W 460V Lot of 2

NEW LEVITON PULL CHAIN SWITCH 003-1689 0031689

FOXCONN CONTROL CONTROLLER DISPLAY PANEL 0-3598 GE C-2800 C1383-004

PPE Heat Band 66301-B 66301B 400W 460V Lot of 2

WALCHEM COOLING TOWER CONTROLLER WCT310-1N1 WCT3101N1 10A

PNEUMATIC G1019060/012 Filter G1019060012

John Crane Seal 81175 1.875" New

NEW SANFORD MILLER RESISTOR 6RS22P B6AH1

Unknown Brand Heating Element 750162G2 

NEW POWERWARE P17P7249 200-240VAC POWER CABLE PC-UN ASSEMBLY 12 AMP A 12A 

KRALOY 12"x12"x4" NON-METALLIC PVC PLASTIC ELECTRICAL ENCLOSURE BOX

Turck Proximity Sensor Bi2-M12-AP6X 1 stuck NEW

NEW SPC TECHNOLOGY POWER SUPPLY SPC11479 

HOHNER Encoder AM-33321/550 AM33321550 5 pin NEW 

WESTINGHOUSE BREAKER FD3070L 600VAC 3 POLE

Honeywell Micro Switch GLAA01A4J New

BLINKGEBER LG.NR.4/920 437/9 W/ SAIA UDS1NJ1A1OBZ134

Newport Digital Volt Meter 2003B-2/ZE09 2003B2ZE09 115 VAC 5 Watt Used

LOT OF (2) PANDUIT C4LG6 WIRE DUCT COVER 6' 6FT STRIPS 4.25" WIDTH x .37" DEPTH 

 NEW PRX POWER TRANSISTOR MODULE 150C120BIL  T6001511304BT 9603

DEVAR ISOLATED SENSOR TRANSMITTER 18-115ASG 18-115A NEW

BONITRON REGEN REGENERATIVE REGENERATION MODULE 3345 M3345-46VMFM 460V 120A

Johnson Controls Platinum 10' Avg Sensor TEA-J000000 

NO NAME HCGFAR 1200 MFD 400 VDC CAPACITOR NEW

Drager Polytron IR Ex Fixed Gas Detector ARMJ-0030 w. Sensor IR ARMF-0017 Used

Honeywell Micro Switch SW8A 130V 3Amps New

Precision Brand Steel Shim 16670 .031 Gauge 12" x 120"

NEW CONTITECH TIMING BELT 240 L A18083 240L 240LA18083 1" WIDE

EATON CH6L3125SP CH6L3125FP 125A 125 A AMP 208Y/120V 240V BREAKER PANELBOARD NEW

WESTINGHOUSE MCP03150 A200M0CACD SIZE SZ 0 120V UNFUSIBLE MOTOR STARTER COMBO

GE Fanuc Input Module IC693MDL640C 24VDC 16PT Pos Logic

NEW EMECANIQUE COIL SUPPRESSOR MODULE 023317 LA4 DC3U 24-250V AC LA4DC3U

Fast Heat Heat Band Lot of 2 BB022176 500W 240V EH PX

NEW TOSHIBA GTR MODULE MG75Q2YK1 

HONEYWELL STD624E-A10-803A PRESSURE TRANSMITTER AS-IS

Lot of 5 Appleton Conduit Fitting CN-200 2" NPT New

SIEMENS W0816B1200CT 200A 208-120/240 OUTDOOR LOAD CENTER BREAKER PANELBOARD NIB

NEW LOT OF 2 LITFUSE INDICATOR FUSE FLSR 60 ID 60A 60 A AMP 600Vac FLSR60

Exac Series 8300 Mass Flow Transmitter 8300 EX-FM2 8300EXFM2 115 VAC 35W Used

ROSEMOUNT 3051 CG4A22A1AS1 BASF PARENT TRANSMITTER NIB

Detas 900307 Transient Suppressor 575VAC/7.5KW New

New 3M Connector Ejector Header 3433 50 Pin

NEW LOT OF 2 BURNDY CABLE CLAMP UTG14AC SIZE SZ 14

PHILIPS ECG COMPONENT 128 ECG128 TRANSISTOR NEW 

New Fast Heat Band Lot of 2 BM023786 700W 240V HP

OPTO 22 Output Relay OAC5 Lot of 2 Used

Dwyer Differential Pressure Switch 1627-5 16275 New 

YASKAWA YASNAC ERC ROBOTICS ROBOT CONTROL STATION OPERATOR JZNC-OP111B P/N: 75

BARBER-COLMAN TEMPERATURE CONTROLLER 570 5743-09030-430

emecanique Altivar Ac Drive ATV452U75S Series 45-2 10 hp 10hp 575v 11a 16.5a

SCHMERSAL Switch AZM 161ST-33rk-024-2111-1 NEW

NEW TRI-TRONICS FIBER OPTIC MODE SENSOR UCFR-A UCFRA 

Allen Bradley 2711 Memory Card Retainer 77135-146-52  7713514652 New

RELIANCE ELECTRIC RESOLVER INPUT MODULE 57411-2 0-57411-2E 0574112E

NEW SCHRADER BELLOWS FLOW SPEED CONTROL VALVE 3250 A 3250A 1/4"  NPT

ADALET 3-3/16" EXPLOSION PROOF ENCLOSURE 1/2" XIHDGCX-2

DeVilbiss 4' Fluid Kink Guard OMX-4023 OMX4023 New in Sealed Bag

NEW MICRO SWITCH MERCURY SWITCH SA452B13

XLNT HOFFMAN A727212ULP 72"x72"x12" PEDESTAL ELECTRICAL ENCLOSURE W/ BACK PLATE

BULLARD ROLLOX 7A 7 HOIST HOOK 8-1/4" RD6 NEW

LOT of 10 Festo QST-6-4 Push in T Connectors NEW

NEW LOT OF 3 SOUTH LAND CARBON MOTOR BRUSH 21342 E3 1-3/8"L 25/32"W 1/2"TH

Electronic Enterprises Electronic Electron Vacuum Tube 6Y6GA 7 PIN New

NEW NO NAME HEATING UNIT FOR 135 PRESS W/ 3X5 YOUNG AMERICA BRASS DIE  

NEW B&G THERMOMATE OPERATOR 6'6" REMOTE SENSING BULB TM61 109302

Yarway Impulse Steam Trap Kit 30-130 3/8"/1/2" New

NEW ALLEN BRADLEY DATAMYTE CONNECTOR CABLE CORD 90645 90645-005 6' FT 90645005

NEW COOPER LIGHTING GE FIXTURE 12T12WHU-MMX 12T12MHWH

EUROTHERM PARKER SSD 590 AC DRIVE MODULE 6011-P-00 6011P00

SER-SIT BC 1610 F Bushing BC1610F 30 Bore New

NEW LOT OF 44 NO NAME TEST PROBE 600042 

NOS 16' 16 FEET ANACONDA 3" LIQUID-TIGHT FLEX FLEXIBLE METAL PVC CONDUIT 

Industrial Performance Lamps/Bulbs 6S6/24CS 24 Volt 6 Watts Lot of 10 New

ABB B50 Contactor B50C-* B50C-222 240V W/ CA7 & CAL7

BOSCH 1 824 462 005 1ST/PCS CONNECTION CABLE / PLUG NEW

EMS Power Power Supply 7694 230 VAC 15 VDC 200mA Used

NO BRAND SENSOR UNIT 626217C 626217-C 23.6207

ALLEN BRADLEY 800FP-P3PN3G 800FPP3PN3G SERIES A GREEN PILOT LIGHT NEW

Hub City Model 184 Gear Reducer 0220-60335-184 Ratio 20:1 Used

AIR MONITOR VEL-TRON VEL-TROL DIFFERENTIAL PRESSURE TRANSMITTER 11000AZ PT-20

MURR Elektronik 1PH 1 Stage Line Filter 10216 250V 20A Used

NEW GE BALLAST 8G1713F CLASS P .38AMP A .38A  118Volt 8G1713

YOKOGAWA 2302 21-VLE-2 24 VDC ELECTRONIC HYBRID METER 

OMRON CPU BASE UNIT C200H-BC101-V2 C200HBC101V2 10 CHANNEL

HERMARY OPTO ELECTRONICS SKAIN HEAD HERMARQX SCANNER LPS-2016 LPS2016

SENSORTRONICS SENSOR 60040-250 250 lbs 3.356mV/V

SEAGATE HARD DRIVE HARD DRIVE ST-151 ST151 5V 12V

Mercoid Control  Switch DAW-33-156 R 4 DAW33156R4  NEW

PELCO DESKTOP CAMERA CONTROLLER MPTAZ115DT 115 AC 115W 60HZ

LG FLATRON M3201C-BAE .AUSLLC 32" DISPLAY MONITOR TV EVISION SCREEN

NEW CAPP USA MAGNETIC REED SWITCH 407521  

 NEW INGERSOLL BRASS BRONZE IMPELLER PMPTINGRD05 

International Dichlorofluoroethane Sensor 420IQ NEW 

Crouzet Gordos Output Module C4OAC 12-120 VAC 4-32 VDC 3A 3 A Amp Used

Mitsubishi MELSEC-Q Input Unit QX41 24 VDC 4mA Used

Microframe Model 6300 Indoor Display Countdown Timer D6320 24/115 VAC Used

SENSTRONIC F-67700 SEM 35/2002 65067 A126305PKS25KT6

Allen Bradley PhotoSwitch Diffuse Control 42SRP-6003 Series B 10-30 VDC New

PHOENIX INTERBUS SUBMASTER MODULE IBS STME 24 MA-FT

NEW ROSS VALVE BODY SERVICE KIT 1017K77 

Intec Corp Power Control 7010056 SCH Rev F Used

Westinghouse Motor Brush Lot 4 W2098 1-3/4"x1-1/2"x1/2"

Turck MultiProx B15-G18-AZ3X-B1431 Proximity Switch NEW

NEW EDWARDS INCANDESCENT LIGHT 114SFINA-G1 114SFINAG1

SQUARE D SECTIONS 1828-C20 TERMINAL BLOCK NEW

NEW NO NAME CAST ALUMINUM ELECTRICAL WEATHER PROOF HEAD 4" SERVICE ENTRANCE CAP

NTE SPECTROL POTENTIOMETER 1K OHMS 502-0080 357-0-0-102

WARNER ELECTRIC CLUTCH BRAKE UM 100-1020 FBC 90VDC 90 VDC 27W 27 WATT 3600 RPM

Lube Automatic Lubricator MMXL-III MMXLIII 3 min Interval 5.5 CC 3 kgf/cm2 New

Bulgin-Source Circuit Board Card SAX50-01-1 SAX50011

Quartech Operator Interface Touch Panel Keypad 8330 ABX 8330ABX 5.2 VDC Used

No Name SA 18-193-359-501 HEATER SPACE NEW

DOVER FLEXO TENSION EQUIPMENT CONTROL BOARD TI8 .25 AMP

ROXBURGH MOTOR INVERTER FILTER MIF3100 520V 100A 100 A

SCIENTIFIC COLUMBUS RMS VOLTAGE TRANSDUCER 3567A-2 600V

Acopian AC to DC Power Module 15EB20 Used

KLOCKNER MOELLER BUSS BAR B3.1/5-PKZ0 B315PKZ0 - USED

DELAVAN PV320R-27697-5 7223 HYDRAULIC PUMP 1 1/8" SHAFT

Durant/Eaton Shaft Encoder 38150 10 Pulses Per Rev Used

Furnas Limit Switch Actuator 54LAP644 Adjustable Arm Nylon Roller NEW

Lot of 8 No Name KS1473 Steel Carbide Insert Shim KS-1473 New

ABB ACS601-0006-4-000B1200801 FRONT COVER ACS-600 ACS600 Used

4 Sprecher+Schuh S&S Terminal Block VRE2-6 VRE 2-6 6mm2

LOT OF 9 KB 431-PPB-LED-01 431PPBLED01 LED CARD / BOARD

PHILIPS 3186GN612T350ALA1 6100 UF 350 VDC CAPACITOR

DYNAPAR QUBE ENCODER MOD# 2101201240 MFG CD# C294413-0004 DAT CD#9420 3/8" SHAFT

emecanique XS1M18MA250H4 Proximity Sensor XS1M18MA250H4 24-240V Used

TOSHIBA POWER MODULE 30L6P43A

NEW ALLEN BRADLEY PHOTOSWITCH SPECIAL FUNCTION PHOTOHEAD 42MRA-5000 SER B 

ELECTRONICS CORP UV EYE 45UV6 1009 45UV61009 45UV6-1009

KILLARK GECLBT-3 1" CONDUIT OUTLET BODY NEW

TURCK PICOFAST SNAP ON PKG6Z-6 PKG 6Z-6 PKG6Z6 PKG NEW

UNITED ELECTRIC 400 SERIES CONTROLS J400-358 NEW

Asco Red-Hat Rebuild Kit 310387-HW 310387HW New

LOT OF (3) TYTON HELLERMAN TC2 PANDUIT WIRE DUCT COVERS 2" WIDTH 6FT 6' LENGTH

Cutler Hammer E50RB Limit Switch Receptacle Ser. A1 New

VC Tools VHCS #2-3/0 3/0 Lot of 4 Compression Lug New

GE Programmable Controller 10-Slot Base IC693CHS391E Used

SIGMA DOUBLE LANE CONVEYOR CONTROL 71.9

General Electric Safety Switch TH3222 2 Pole 2p 60 a amp 60A Fused 

ZENITH TENOR 24 HOUR CLOCK AED-24H-C AED-24HR 240V 60Hz

LANTRONIX TRANSMITTER MODULE WBX2100 WBX-2100 310-502 REV B 080-298-000 REV A11

KUBLER HEINRICH SWITCH/SENSOR FLUM 40 VA 220V NEW

NEW FURNAS NORDIC SOFT START INDUCTION MOTOR CONTROLLER 91DK110 1.5 HP 115 VOLT 

HTM ELECTRONICS CATEGORY 4 SAFETY 46" LIGHT CURTAIN SE4 30-120-PP 24V