滤波电路用以消除输入触头的抖动，光电耦合电路可防止现场的强电干扰进入PLC。由于输入电信号与PLC内部电路之间采用光信号耦合，所以两者在电气上完全隔离，使输入接口具有抗干扰能力。现场的输入信号通过光电耦合后转换为5V的TTL送入输入数据寄存器，再经数据总线传送给CPU。
输出接口电路向被控对象的各种执行元件输出控制信号。常用执行元件有接触器、电磁阀、调节阀(模拟量)、调速装置(模拟量)、指示灯、数字显示装置和报警装置等。输出接口电路一般由微电脑输出接口电路和功率放大电路组成，与输入接口电路类似，内部电路与输出接口电路之间采用光电耦合器进行抗干扰电隔离。
ALLEN BRADLEY,855T-G10BR6,STROBE LIGHT MODULE
FESTO CYLINDER DSNUP-A-S2-S6-R3 7/8" STROKE 1" BORE
BEARINGS 1875-T 5 LOTS OF 8
WHITE ROGERS 24A05E-1 LEVEL TEMP SILENT OPERATOR
SOCOMEC T.4 1000A. gG-gL 500V INDUSTRIAL FUSE
ORION SIZE 7 STARTER CRC-600
GE HEAVY DUTY SAFETY SWITCH TH 3221J
ACOPIAN U24Y500 UN-REGULATED POWER SUPPLY 250V
INA BEARING, CAM FOLLOWER F8A4 1101 KR52PP
JAMESBURY SERIES 300 VALVE 600 CWP 1 1/4"
MICRO MOTION TRANSMITTER FIELD MOUNT MOD# 1700R11ABUEZZZ
OMEGA ENGINEERING PSW-375 PRESSURE SWITCH
SPICER PTO JOINT COMPONENT LOT OF 2
YASKAWA ELECTRIC CDBR-4045B DYNAMIC BRAKING TRANSISTOR MODULE 750
Industrial Dynamics POWER SUPPLY BOARD
REXNORD NST 1-1/4 RD KWSS, SPROCKET NO BOX
ITT,SPRING CLOSED VALVE, 1"
TRD MANUFACTURING 2"X3" PNEUMATIC CYLINDER 2" BORE 3" STROKE
A.O. SMITH 5422 ELECTRIC UNIT HEATER 230V 3PH 0.2AMPS 50/60AMPS 1550RPM 9W
FOXBORO 8002-SCR-G MAGNETIC FLOW TUBE
APV 2", 2X2,VALVE PLUG,ROSISTA SERIES
SPX PROCESS EQUIPMENT WAUKESHA 404B02 14WNI 4" TUBE X SCH5 304 SPECIAL
UNIVERSAL BEVERAGE EQUIPMENT CARBO COOLER VALVE 1.5" PIPE IN 1/8" NPT OUT
ALLEN BRADLEY MPL-A1530U-VJ42AA SERVO MOTOR
ALLEN-BRADLEY 100-C12*10 CONTACTOR AC-1 690V
ORANGE RESEARCH 1516DG-1C-4.5B GAUGE, MEASURED IN H2O
NEPTUNE PUMP 2" IN 2" OUT MODEL 24
MICRO SWITCH TR1R PHOTOELECTRIC 5VA 5AMP/POLE 115VAC NON-INDUCTIVE
TELEMECANIQUE XCK-J5970H7 LIMIT SWITCH
Cutler-Hammer / Westinghouse HFD3030L 30 amp Breaker
POTTER & BRUMFIELD CKB TIME DELAY ON RELEASE ADJUSTABLE W/ IDEC SR3P-05
ALLEN BRADLEY 20A E 022 A 0 AYNNNC0 SER A POWERFLEX 70
ALLEN BRADLEY 42MTB-5004 PHOTOSWITCH TERMINAL BASE *LOT OF 2*
LEVITON 420R7W WATERTIGHT RECEPTICAL 20A/480V 3PH
TRI-CLOVER ACTUATOR
SEW EURODRIVE MDX60A0030-5A3-4-00 + MDX61B0030-5A3-4-0T (DRIVE INVERTER)
TRANSFORMERS LOT OF 3 2.2KVAS
C3 330-CL455 COMMONING LINK 45MM 5 POSITION
DODGE 262 TIGEAR RELIALUBE W/ UNIMOUNT 125 ENCLOSED HIGH EFF. MOTOR 1.5HP
MARTIN 60BS16 SPROCKET 1 1/8
LASCO 6" CLASS 150 D-3139 S.E.
ADC PXP DIGITAL SIGNAL CROSS-CONNECT PANEL NIB
TOLOMATIC RKBC212 SK42 PNEUMATIC BAND CYINDER REPAIR KIT
TRI-TRONICS PM 8200 DUAL EVENT CONTROL RELAY with SOCKET
