輸入接口

　　輸入接口用于接收和采集兩種類型的輸入信號，一類是由按鈕、轉(zhuǎn)換開關(guān)、行程開關(guān)、繼電器觸頭等開關(guān)量輸入信號;另一類是由電位器、測速發(fā)電機和各種變換器提供的連續(xù)變化的模擬量輸入信號。

　　以圖2所示的直流輸入接口電路為例，R1是限流與分壓電阻，R2與C構(gòu)成濾波電路，濾波后的輸入信號經(jīng)光耦合器T與內(nèi)部電路耦合。當輸入端的按 鈕SB接通時，光耦合器T導通，直流輸入信號被轉(zhuǎn)換成PLC能處理的5V標準信號電平(簡稱TTL)，同時LED輸入指示燈亮，表示信號接通。微電腦輸入 接口電路一般由寄存器、選通電路和中斷請求邏輯電路組成，這些電路集成在一個芯片上。交流輸入與交直流輸入接口電路與直流輸入接口電路類似。

　　cissell utility DRY CLEANING STEAM press cylinder spring for AU-42 PART 118108

　　NEW DEVILBISS TGHV-410-F SPRAY GUN TIP & NEEDLE FHV TGHV-4000-F

　　13 GO NO GO SMOOTH PLUG GAGES, MIXED LOT, .545" THRU .561"

　　REGAL-B PLUG GAGE GO .560/Z NOGO .566/Z 9258609G39

　　MIL. PLUG GAGE GO .280 NO GO .285 JO.5782 S-11485 60325 60325-8-3

　　THE PIPE MACHINERY CO. FP-68-188 PLUG GAGE GO .230 NO GO .240 1-3 60295

　　MIL. PLUG GAGE GO .247 NO GO .252 JO. 5782 S-11444 60332 60332-18-4

　　new KEB Combivert F5 07.F5.B1B-LB0A w/ Operator PANEL F5 07.F5.B1B-LBOA 1.8 KVA

　　RELIANCE ELECTRIC 101124-57T POTENTIOMETER CUSTOM COMPONENT PCB BOARD 82746-86B

　　new EFD MBAC 30.48 PCB/MODULE EI068A

　　BESLY PLUG GAGE GO .562 X NOGO .563 X 2424459 GT 5095 431318 79124

　　KAWASAKI MF6525 1 HY PC CONTROL BOARD 1HY-31 50999-1694

　　NEW Fafnir Ball Bearings FAFNIR 207PP USA W207PP

　　COLLIS 75543 50CV 1-1/4 SM 5.50 PRO 1-1/4" SHELL MILL HOLDER, CAT-50 5118-2802

　　new Square D magnetic Motor Starter NEMA 2 8536SDG1H20S SER A 3PH 230V 15HP BA

　　SUNX NA40-CC7 LIGHT CURTAIN SENSOR MATING CABLE 00262

　　NEW Omega Horizontal Buoyancy Switch P/N LVH-300

　　MASTER TOOL CV50-A40-4.00 CAT 50 TOOLHOLDER 3 3.9956 GAGE LENGTH

　　TRU-FLO UT36-SR4-FO7 PNEUMATIC ACTUATOR, 150 psi, 90* ROTATION UT36-SR4-F07

　　NEW PC BOARD TUCKER B430E 110703 ZA1043 AZ02 LM SERVO CONTROLLER

　　NEW IKO LWHT-20-C1 B LINEAR RAIL BEARING BLOCK H S2 /JR BB

　　PARKER PNEUMATIC AIR CYLINDER P1A-S016MS-0200

　　PARKER D3W1HNYCFR456 14 HYDRAULIC SOLENOID VALVE 300PSI

　　VAN KEUREN CO PLUG GAGE GO .0398 NOGO .0400 BAN-836890-00-T?1 XX

　　NEW MAC 82A-0A-BKA PNEUMATIC VALVE SOLENOID MAC 82A-OA-BKA

　　NEW MARPOSS 1241454900 MASTER CALIBRATION GAUGE HOLDER 99UT257 68F 24SE-15489

　　RTA PAVIA GMD 03 STEPPER MOTOR DRIVE MURR ELEKTRONIK

　　NEW SANYO SDN-DR2-100 SERVO NUTRUNNER DRIVE CA55E-10 CA

　　NEW PARKER HTR 9-0903C-CH62V-A ACTUATOR MOTOR BG

　　the pipe machinery go no go plug gauge inspection gage .821 .832

　　OMEGA 871A DIGITAL THERMOMETER K TC NICR-NIAI

　　NEW SQUARE-D CLASS 8501 TYPE XD0 80 CONTROL RELAY TYPE XD EIGHT POLES MAX

　　KNIEL CPM 1201 V2 POWER SUPPLY, 115/230VAC, 45-440 Hz 331-101-00 .02

　　NEW GRECON 566825 ULTRASONIC SPARK SENSOR DETECTOR

　　USED PROSYS MAATEL UC-CAN 16296BH011.A0 CONTROLLER 502585 3 19096BH001.C F.COMP

　　GREENFIELD PLUG GAGE GO 1.0115 NOT GO 1.012 SA 1-20335

　　lot 3 PIPE GO NO GO PLUG GAGE NOGO 1.3770 1.377 1.382 1.385 1.390

　　lot 3 PIPE GO NO GO PLUG GAGE NOGO 1.365 1.385 1.390 1.369 1.371

　　lot 3 PIPE GO NO GO PLUG GAGE NOGO 1.3440 1.3450 1.385 1.390 1.3470

　　lot 3 PIPE GO NO GO PLUG GAGE NOGO 1.420 1.3770 1.3900 1.389 1.408

　　GLASTONBURY SOUTHERN PLUG GAGE GO .6601 Y NOGO .6640 Y B02 B-53284 S-27898

　　new Honeywell MicroSwitch Heavy Duty Proximity Sensor PK 8281-1 PN 922AA2W-A9N-T

　　used SANYO DENKI 20BA150FFWB4B SERVO AMPLIFIER BL SUPER

　　NEW SANDVIK 431-363141 R2 MILLING/BORING INSERT TOOL HOLDER 949443512 431-333141

　　USED RAYTEK RAYT5B THERMALERT V INFRARED TEMPERATURE SENSOR BG

　　PRATT & WHITNEY 3B JIG BORER 7/16" COLLET #2 MORSE

　　FAG 6206.2ZR.C3 Shielded Bearing F282-0506.HB 6263 C3

　　NEW TOPWORX 73-13528-B20 PROXIMITY SENSOR

　　MORRIS TOOLINE SDH25-ER20 COLLET CHUCK

　　PRETEC,ERNI, PCB BOARD 6120.521.550, 990E.CIF.550 VIDEO CONTROLLER

　　NEW HYTEC/SPX 100143 HYDRAULIC WORK SUPPORTS, 1100 LBS @ 5000 PSI

　　MEASUREX PCB MODULE QUAD TACH/COUNTER ASSY NO 05317200 REV C

　　10 SANDVIK 009242N48 8.05 2040 CARBIDE INSERTS X066000X

　　USED CARBOLOY CV50-EM6.00-125?0 MILLING 1-1/4" TOOL HOLDER, CAT-50

　　NEW COOPER CROUSE-HINDS 5000111-5 5-PIN FEMALE CABLE ASSEMBLY