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PLC的外部設備主要是指控制系統中的輸入輸出設備，其中輸人設備是對系統發出各種控制信號的主令電器，在編寫控制程序時必須注意外部輸入設備使用的是常開還是常閉觸點，并以此為基礎進行程序編制。否則易出現控制錯誤。
在PLC內部存儲器中有于輸入狀態存儲的輸入繼電器區，各輸入設備（開關、按鈕、行程開關或傳感器信號）的狀態經由輸入接口電路存儲在該區域內，每個輸入繼電器可存儲一個輸入設備狀態。PLC中使用的"繼電器"并非實體繼電器，而是"軟繼電器"，可提供無數個常開、常閉觸點用于編程。每個"軟繼電器"僅對應PLC存儲單元中的一位（bit），該位狀態為"1"，表示該"軟繼電器線圈"通電，則程序中所有該繼電器的觸點都動作。輸入繼電器作為PLC接收外部主令信號的器件，通過接線與外部輸入設備相，其"線圈"狀態只能由外部輸入信號驅動。
鄭娟萍
廈門仲鑫航自動化設備有限公司
PLC的各種功能主要是通過運行控制程序來實現。編制程序時，需要合理使用PLC提供的編程元件（即軟元件）。FPO型PLC中常用的編程元件有兩種：位元件（bit）和字元件（word）。位元件實際上是PLC內存區域所提供的一個二進制位單元，又被稱為軟繼電器，主要用作基本順序指令的編程元件，如輸入繼電器Xn、輸出繼電器Yn、內部通用繼電器Rn、定時（計數）器等，其參與控制的方式主要是通過對應觸點的通斷狀態改變影響邏輯運算結果即輸出。
字元件則為PLC內存區域內的一個字單元（16bit），主要用作功能指令和高級指令的編程元件，通常用以存放數據，如數據寄存器DTn，定時(計數)器的設定值SVn、經過值EVn等。字元件沒有觸點，通常以整體內容參與控制。
AUTOMAX S50DA PNEUMATIC ACTUATOR BUNA-N 1/2 VALVE
Furnas Electric Speed Selector FJL0342L JH51 5HP 3PH
NO NAME B-3A B3A 4X888 WIRE BUCKLES 1000 PCS. NIB
Parker Solenoid 1/8" B320BC549C 15MM/24VDC
LOT OF 2 NEW NTE INTERGRATED CIRCUIT SOUND AMP NTE1188
NEW AMPHENOL COAX COUPLER ADAPTER CONNECTOR 90° ELBOW FITTING 554-89
Zypcom Data/ Modem Z32T-SE Z32TSE w. Mounting Hardware Used
Welex Heater Band 0737-4702 07374702 250W 240V 2" ID X 2.5" LG w/ Term Box New
New Baumer Proximity Switch IFR 18.24.45 IFR18.24.45
Square D 9001KT1R31 Pilot Light 9001-KT1R31 Ser. J New
HONEYWELL TEMPERATURE CONTROLLER CONTROL 8460-011-A 8460011A 92103487-003-05 NEW
Johnson Yokogawa Vortex Flow Converter YFA11-AUPA-04*E 24 VDC 4-20mA Used
Bender Residual Current Monitor RCM470LY-7121 84VDC 250VAC 5 Amp Used
emecanique XS1L06PA340 Proximity Sensor XS1 L06PA340
STI SCIENTIFIC TECHNOLOGIES OPTOSAFE P4100B 30" LIGHT CURTAIN TRANSMITTER P4130B
STI SCIENTIFIC TECHNOLOGIES OPTOSAFE P4100B 30" LIGHT CURTAIN RECEIVER P4130B
MITSUBISHI D/A CONVERTER UNIT A1S62DA 4-20mA
Siemens 3TF4422-0A Contactor 3TF44 3TF44220A 24V Coil
NO NAME CAPACITOR C10000 AFC 35UF 280VAC 90°C C10000AFC
Milton Roy LMI Roytronic Series P Metering Pump P141-358SI 0.57 GPH 250 PSI Used
DENT NELSON PNP STEP SENSOR DS2442 2442 NEW
NEW SHINKO ELECTRIC - ELECTRIC BRAKE PART NB-0.3 24VDC
HART 264DSMSSB1A1V1F6B1N2 PRESSURE TRANSMITTER MWP OVP 3045 PSI SPAN .87-87 PSI
Yokogawa Panel Meter 250425ECPB ES=0-50mVDC 75-0-75 DC Amperes 4-3/8"L X 4-7/8"W
Siemens Overload Relay 3UA5000-1J* 6.3-10 amp Class 10a
MOTOROLA SCM90059C 7913 SEMICONDUCTOR CHIP LOT OF 6 NEW
NO NAME HEAVY DUTY SWIVEL RETRACTABLE ELECTRIC CABLE WIRE REEL 20" DIA.
allen bradley POWER CORD 9101-1385-010 B REV. A FOR Y
National 5727 7 Pin Vacuum Electron Tube New
SIEMENS SIMATIC S5 DIGITAL INPUT 6ES5 431-8MA11 8x24Vdc
HAYWARD AQUAVAC TIMER TIME CONTROL CONTROLLER
Honeywell Plug-in Purge Timer S427D 1007 S427D1007 120 Volt Used
Lot of 3 MCI 4-04-1303 Transformer 4041303 2200V HIPOT
PAPST AXIAL FAN 4412 FM 12V DC 270mA 3.2W 4412FM
Berko Cold Control Thermostat WT1 25A 25 A Amp 250 VAC Used
SQUARE D CONTACTOR 8536 SBG2 SER A 120V COIL SIZE 0 SZ 0 600Vac 8536SBG2
NEW VEEDER ROOT PROXIMITY SWITCH 778514-522 778514522
Landis & GYR PolyGyr Enclosure ARG61.01 ARG6101 New
TOSHIBA NETWORK MODULE TOSLINE-F10 FDI633*K FDI633K
Intec Corp Width Disc Model 0202 70100078-02 SCH Rev B Used
New D&R Lamps Minature Lamp Bulb Model 259 Lot of 10
NO NAME 3922 536 07860 392253607860 CASSETTE STATION
SOLA MINI/MICRO COMPUTER REGULATOR 63-00150-0800-23
AIR MONITOR PRESSURE FLOW TRANSMITTER VELTRON II 38729
PROCOM DENMARK LIROS OMNIDIRECTIONAL ANTENNA CXL 2400-6 18414-11 2300-2500 MHz
ALLEN BRADLEY UPPER SWITCHING MODULE S100208 50283
NEW INTRONICS DC CONVERTER BLOCK MODULE INT 171J INT171J
NEW WATLOW THERMOCOUPLE 11DJSGB024A G60331
Square D Relay Hold Down Clips 8501NH82 Series A Lot of 10 New
CSI 444 STROBOSCOPE WITH 444-2 POWER SUPPLY
ALLEN BRADLEY 42SRP-6007 PROXIMITY CONTROL 42SRP6007
NEW WESTINGHOUSE 1 BUTTON ENCLOSURE PB1ED1 30.08mm HOLE SIZE 3/4" NPT
NEW Pacific 12 99 PL04NO73P 240V 120V 750W/187.5W
CHALLENGER 202-LP3 3BN 20 KVA 20KVA 460V HI 266V LO TRANSFORMER
INTERROLL ART DRIVE ROLLERDRIVE S/S S3E50 24V CONVEYOR ROLLER 36:1 11-5/8" 8"
NEW WIRE PRO INC CABLE JACK CONTACT CONNECTOR 91-MC6M 91MC6M
NEW ALLEN BRADLEY PRESSURE CONTROL SWITCH 836 AV11-JKC 836 AV11-JKCS 836AV11JKCS
15 IMPERIAL EASTMAN 761FB06 BRASS HI SEAL NUT NEW
CHROMALOX MT0-2XX 156-5000595-004 OIL HEATING ELEMENT
NEW NAIS UZQ2100 PROXIMITY SENSOR UZQ-2100
VEEDER-ROOT PROXIMITY SENSOR 650800-010 650800010 - USED
NEW BI TECHNOLOGIES PASSIVE COMPONENT 78LBWR500
Honeywell Micro Switch Proximity Sensor 982FS0.8-A3P-GL
ROSEMOUNT 1151DP4E22M1B1 PRESSURE TRANSMITTER 0-100 IN. WC W/ MANIFOLD
HONEYWELL TEMPERATURE CONTROLLER TEMP CONTROL DC3002-0-310-1-00-W111
IFM Efector Sensor II5479 IIA3010-BPKG/BS 10 mm f 10-36V dc 250 mA New
No Name Thermocouple 5-3/4" X 30' BS28H13A New
TRANSFORMATIK REACTOR M001619-50 63976-902B 006-3/009-5 REV C
MITUTOYO DIGIMATIC DIGITAL INDICATOR 1.2" ID-130ME ID130ME 543-423-1 5434231
NEW SOLA POWER SUPPLY 83-24-260-03 832426003 24VDC 6A 6 AMP A
EMECANIQUE PROXIMITY SWITCH XSA-V11801 XSAV11801 - USED
New AJM Gear Set 5667
ISB ISB-IV Light Curtain Receiver ISB4-18-STD ISB418STD 120VAC 360VA 360 VA 18"
Martin 80BTB17 2012 Sprocket 80BTB17 2012 New
Hornel Dr. E. Horn GmbH EV002110/7-1230-206 Power Pack
NEW ALLEN BRADLEY PILOT LIGHT 800T-PB26 800TPB26 240V 60HZ SER T
TUTCO 17H1 DHC6185-31.0-3P 460V 3PH DUCT HEATER W/ INTEGRAL LIMIT CONTROLS NEW
2 Allen Bradley EEPROM MEMORY 2711-NM2 2711NM2 NEW
ATKINS TECHNICAL TEMPERATURE PROBE 49119-J 49119J
Netgear 8 Port 10/100 Mbps Dual Speed Hub DS108 Used
New UDT Model 101A Amplifier Output Off Low Sens Input
TOYODA SANYO MC1K ROBOT ROBOTICS TEACH PENDANT PANEL KEYPAD MC1K-PE
SYLECG175 ECG175 ECG 175 TRANSISTOR NEW
Fibro Gas Spring Pneumatic 2480.13.00750.013 150 Bar 750 daN New
METTLER TOLEDO KIT 8510-20X1 8510 20X1 851020X1 NEW
LOT OF 2 NO NAME CEU-P 560 UF 400 VDC CAPACITOR
STI MiniSafe-B Light Curtain Receiver MS4312B MS4312B 12" 30FT Used
PARKER SLD 13-7SV SUCTION LINE FILTER DRYER NEW
MILLER RECTIFIER HEAT SINK 145266 6P 715959 NEW
Sprecher & Schuh Contact DE1-10 DE110 10A 10 A Amp 500 Volt New
YASKAWA AC SERVO MOTOR SGMP-02AWYR12 200V VOLT 2.0A A AMP 200W WATT
NEW LOT OF 3 3M SCOTCHLOK BUTT CONNECTOR TERMINAL MC250BCX
NEW TCI LINE REACTOR KLR6ATB 600 V 3 PH 6 A SINE GUARD
HOKUYO PHOTO MASTER SWITCH SENSOR PB4-H1N PB4H1N
ANDERS 3 SPEED CHART RECORDER 5350 230 VAC USED
RITTAL BUSSBAR ADAPTER CONNECTION COMPONENT SV-3000 SV3036 SV-3442
Giddings & Lewis DC Output 502-02954-01 501-03427-01
BECKHOFF DIGITAL OUTPUT MODULE KL2012 KL-2012 24V 0.5A
IRCON MODLINE 3 INFRARED THERMOMETER SENSOR 3R-32FF5 3R32FF5
NEW FLEXOVIT HIGH PERFORMANCE RESIN GRINDING CUPSTONE N5250 A-16-QB 5X2X5/8-11
BRONKHORST HI-TEC KERKEWIJK 65 CIRCUIT BOARD CARD 401313C0638
TAYLOR & GOODMAN TRANSFORMER C0385848 500 UH-45A A AMP
MSA Chemical Cartridges 464033 Lot of 8 New in Box
Penn All-Range Pressure Control P270AA-118 P270AA118 New
Allen Bradley Dynamic Brake Unit 460V Volt 1332 117772 New
NEW WESTINGHOUSE LAMP CIRCUIT 125V ON/OFF PUSHBUTTON STATION 1764820 600VAC
Triac Controls Electo-Pneumatic Rotary Positioner New
LEM CURRENT TRANSDUCER HAK 100-S/SP1 HAK100SSP1
MILLER FLUID POWER AL62B2N (10" - 13") 5" BORE 1" ROD AIR PNEUMATIC CYLINDER NEW
IWAKI INDUCTOR 25SHX2-12 25SHX212 14Ω OHM OHMS 40KΩ 50MΩ
PYROMATION J-49004G-0033 J49004G0033 THERMOCOUPLER NEW
Siemens 3UA50 00-1F Overload Relay 3UX1418 Terminal
NEW ALEXCO KIT PPP/RK PPP RK PPPRK
NEW RELIANCE CONTACT KIT K-353 K353
SEICO SYNOR 6159172240 34' WIRE CABLE CORD
Honeywell Servoline Recorder Motor 30683612-502 New
NEW AMPHENOL CABLE LINE WIRE CONNECTOR CAC-25 18750
Parker Dial Regulator 52R225RA 3/8" NPT New
USED MURATA CURRENT LOOP CONVERTER
AQUAMATIC P73233F1158 450 WATER CONDITIONING CONTROL STAGER CONTROLLER
Westinghouse 4 Pole Adder Add On Contact Block ARA 766A030G03 Used
STI MiniSafe-B Receiver MS4312B-2 MS4312B2 12" 30FT Used
New Baumer Elec Proximity Switch IFR 14.24.41 IFR142441
New Baumer Elec Proximity Switch IFR 12.82.01 IFR128201
Parker Schrader Bellows M08421830 PSI: 225 NEW
Electromatic Dupline 128 Dual Reciever FAD 1213 120
MANNESMANN REXROTH 372 570 000 2 PNEUMATICS KIT
NEW VEEDER ROOT 653016-300 PROXIMITY SWITCH 653016300
Boston Gear SKSD32 Sprocket SKSD32 3/4" New
Westcode Thyristor Rectifier 240-0006-130 2400006130 New
Schmersal Guard Door Monitor AES 6112 AES6112 24 VDC
NEW VEEDER ROOT 650803-440 PROXIMITY SWITCH 78665661674
PYRONICS 7184-0000 PCA MODULE CONSTANT PILOT 71840000
NIMBUS OVEN TEMPERATURE CONTROL CONTROLLER PSU POWER SUPPLY
PHOENIX CONTACT TERMINAL UMK-16 OM-R/MF/MKDS/P 2972796
BOSTON GEAR SPEED REDUCER GEAR BOX WA309A900K WA309A-900-K MODEL NO. 001 NIB
R-K Electronics On-Delay Timer CCB-115A-2-10S CCB115A210S .1-10 Sec Used
GE GENERAL ELECTRIC COIL 55-501336G2 110V VOLT 60CY 92V VOLT 50CY 55501336G2
Airpax PR21-62-20.0A-XX-V Magnetic Circuit Protector 20A PR2162200AXXV 250V
CON EXECUTONE 1832/3672 DC/DC CONVERTER 2994102
Boston 50B22 Non-Bored Sprocket 50B22 New
No Name Potentiometer ECP10 47K Ω Ohm Omega Lot of 10 New
MITSUBISHI MELSEC OUTPUT MODULE BOARD PLC AY41 AY-41
KLOCKNER MOELLER CONTACT BLOCK E F EF TYPE F
CON EXECUTONE 1832/3672 DC/DC CONVERTER 2994102
Boston 50B22 Non-Bored Sprocket 50B22 New
No Name Potentiometer ECP10 47K Ω Ohm Omega Lot of 10 New
MITSUBISHI MELSEC OUTPUT MODULE BOARD PLC AY41 AY-41
KLOCKNER MOELLER CONTACT BLOCK E F EF TYPE F
NEW BOURNS POTENTIOMETER 3540S-1-503 3540S1503
VACCON ST4 ST SERIES SILENCER NEW
Keyence Illumination LED Ring Unit w. Camera CA-DRW10F CADRW10F Used
ABB STARTER A26-30-10 110-120V COIL 40A A AMP A263010 w/ TA25 DU 10-14A & RA5-1
Athena Temperature Controller NO SCREEN XT18 18JFF0BBA00 1400F 230V 1A 1Amp A
KLOCKNER-MOELLER DIL0-11Z0-1,2/C;3SNA CONTACTOR ENCLOSURE 6-3/4"x9-1/4"x5-1/2"
IDEC SOLID STATE RELAY RSSDN-10A 48-660Vac 10A A AMP 4-32Vdc RSSDN10A
SSD LINK Processor Module L5207-2-00 L5207200 Issue 2 Used
IRCON MODLINE PLUS MODLINEPLUS INFRARED THERMOMETER 2-18F05-0-0-1-32-0/200
NEW PEPPERL + FUCHS PROXIMITY SENSOR 188297 NBB4-F1-US NBB4F1US
NEW KAMLOK CAM LEVER CAMLOCK COUPLING 633-D-3/4 3/4"NPT FEMALE
Trutzschler Counter EWG 3A EWG3A 490-32.330.000 4932330000 Used
Reliance Internix Pocket Programmable Controller PC-2 Used
RHEEM EG6-50-G 50 GALLON 50 GAL. 208V 3PH COMMERCIAL ELECTRIC WATER HEATER NEW
NEW NO NAME ELECTRODE 27729 16" LENGTH
CUTLER HAMMER 10250TC1N SERIES A1 RED PLASTIC LENS NEW
NEW VEEDER ROOT 778311-311 PROXIMITY SWITCH 78665661639
STI TL8018 Safety Interlock 44504-1820 110 V Volt VAC 1/2" NPT Used
emecanique Clark Control Relay CA2-F 120V 2T111-76
PLC DIRECT LOGIC MODULE DL250-CPU DL250CPU D2-250
Atlas Copco 2255-0022-00 Air Compressor Part Shaft 2255002200 New
NEW THERMATOOL SEMICONDUCTOR 17CP083 17CP083 9320
PERFECTING 3D COUPLING 3/8" AIR HOSE SOCKET QUICK COUPLER BRASs CONNECT CHUCK
SNAPLITE RED INDICATOR LIGHT 1050NI 125 VAC 1/2 W NEW
EXIDE CPR UPS UNINTERRUPTIBLE POWER SYSTEM 120V VOLT IN 87/75/60VAC OUT 48VDC
NEW RAYCHEM MOTOR CONNECTION KIT MCK-2V 600V #12- #4 FEEDER MCK2V
New Parker Flow Control FC800-6 FC 800 6 FC8006
NEW SOURIAU CABLE PLUG CONNECTOR UTG61412PN
NEW GE FANUC IC610MDL110B PROGRAMMABLE CONTROLLER HIGH SPEED COUNTER SERIES ONE
SIEMENS 9-001-71365-01 MCC MOTOR CONTROL CENTER PANEL COVER 20"x21" 20 x 21
NAMCO ABSOLUTE ENCODER ABS/ENC CA210-40002 CA21040002
GE Lamp Socket CR104PXG42 New
KUMHO ELECTRIC HF GENERATOR ECONERGY 100W 120 277V KERL100WV
E+H E&H ENDRESS+HAUSER MICROPILOT II 2 LEVEL TRANSMITTER FMR 231A-TGAEJ1C4A
LOT OF 2 MEGATRON/HELICAL POTENTIOMETER 200 OHM AL1710 AL-1710
SQUARE D CIRCUIT BREAKER 80A 80 AMP FAL FAP36080 600V
NEW LOT OF 6 HALEX 90° LIQUID TIGHT CONNECTOR 16907B 3/4"
KELE & ASSOCIATES 4CMA CURRENT TRANSDUCER 4CMA 20A 20 Amp A
GE Overload Heater CR123C379A C379A Lot of 3 New
NEW GE FANUC IC630MDL380A RELAY OUTPUT MODULE SERIES THREE 16 CIRCUIT
K&B CANFIELD CONNECTOR 6-48 VDC/VAC NEW
New Ohmite Potentiometer CU5011 500 OHMS Type AB
JOHNSON CONTROLS DUCT SENSOR TE-6001-1 TE60011 NEW
