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PLC與電氣回路的接口，是通過輸入輸出部分（I/O）完成的。I/O模塊集成了PLC的I/O電路，其輸入暫存器反映輸入信號狀態(tài)，輸出點反映輸出鎖存器狀態(tài)。輸入模塊將電信號變換成數(shù)字信號進入PLC系統(tǒng)，輸出模塊相反。I/O分為開關量輸入（DI），開關量輸出（DO），模擬量輸入（AI），模擬量輸出（AO）等模塊。
開關量是指只有開和關（或1和0）兩種狀態(tài)的信號，模擬量是指連續(xù)變化的量。常用的I/O分類如下：
開關量：按電壓水平分，有220VAC、110VAC、24VDC，按隔離方式分，有繼電器隔離和晶體管隔離。
模擬量：按信號類型分，有電流型（4-20mA,0-20mA）、電壓型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。
ALLEN BRADLEY 42GT-9002-QD SER. A NIB
STI MICROSAFE MC4200 SERIES RECEIVER MC4244RE
SICK FIBEROPTIC LIGHT GUIDE NIB LBSAT 32900 100589
DATALOGIC DS8100 20-30VDC 1.3-0.9A LASER BARCODE SCANNER DS8100-2100
USON 0-30 PSIG TYPE K PRESSURE TRANSDUCER, MODEL 454
HONEYWELL MICROSWITCH PROXIMITY SENSOR 972AAWT185HM-A1?4P-C
SMC PROXMITY SENSOR D-J59W
SICK SAFETY LIGHT CURTAIN C40E-1501AH030 *NIB*
SICK LIGHT CURTAIN AGSE 450-1211
SCHNECK TRANSDUCER T19-W
IFM EFECTOR IIA2010-ABOA/SL?/LS-3000BL SENSOR, NIB
FANUC ROBOTICS ABS2000P PULSE CODER A290-0561-V531
CUTLER-HAMMER COMET SERIES 15-30VDC PHOTOELECTRIC PROXIMITY SENSOR 13103AQD03
DELPHI TS10033 TEMPERATURE SENSOR, NIB
DELPHI TS10059 TEMPERATURE SENSOR, NIB
SERVICE FIRST THERMISTOR RES00860 SEALED
SMC AIR PRESSURE SWITCH IS1000
DELPHI TS10044 TEMPERATURE SENSOR, NIB
DELPHI TS10047 TEMPERATURE SENSOR, NIB
DELPHI TS10041 TEMPERATURE SENSOR, NIB
DELPHI TS10050 TEMPERATURE SENSOR, NIB
BALLUFF 90-250VAC PROXIMITY SENSOR BES 516-410
EFECTOR OTT-FPKG OT5001 DIFFUSE REFLECTIVE SENSOR NIB
BANNER ENGINEERING FIBER OPTIC SENSOR BA1.53PMETA NIB
IFM EFECTOR INDUCTIVE SENSOR IF0311 / IFK2004BAROA
SUNX 0-ADJ PRESSURE SENSOR DPX-400P-RG
GM VOLTAGE SUPRESSOR 43884-0010 30VDC TVS SEALED
ISSC * PULSOTRONICS PROXIMITY SENSOR 9954-2266 * T18-A118
SICK OPTIC ELECTRONIC LIGHT CURTAIN AGSS 750-1111
NAMCO EE530-73400 20-230 VAC/DC PROXIMITY SWITCH
STI * MINISAFE LIGHT CURTAIN RECEIVER * MS4332BR
IDEC IZBARL CONTACT SIGNAL TRANSDUCER IBRC4102FM
IMPACT WELDING ARC AGENT 600A ARC CURRENT SENSOR 01-10011
COMPUTER CONVERSIONS CORPORATION SNAP-TRAK ENCODER HR90-11T-HB
IMO GEMS 20VA 120 TO 240 VAC LEVEL SWITCH, NNB
ALLEN BRADLEY RESOLVER FEEDBACK MODULE 1326AB-MOD-VC 424 *NNB*
VIDEOJET SEIC THROUGH BEAM FIBER PRODUCT DETECTOR 375085-05 REV. BA *NIB*
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