输入输出设备：它用以接收信号或输出信号，便于与PLC进行人机对话。输入的有条码读入器，输入模拟量等。输出的有打印机、编程器、监控器虽也可对PLC输入信息，从PLC输出信息，但输入输出设备实现人机对话更方便，可在现场条件下实现，并便于使用。随着技术进步，这种设备将更加丰富。
ALLEN BRADLEY DRIVE 1336S-BX040-AX-EN REPAIR SERVICE
YASKAWA ELECTRIC BOARD JARCR-XFB04
DWYER PHOTOHELIC SWITCH/GUAGE 3010SGT
SIEMENS SERVO MOTOR 1FT6102-1AC71-3EH1
FANUC PLC MODULE A03B-0807-C152#D
BALDOR VECTOR DRIVE ZD18H220
SQUARE D CONTACTOR EDB36030
SIEMENS SERVO MOTOR 1FK7101-5AF71-1TB2
INDRAMAT SERVO MOTOR MAC112C-0-HD-2-C/130-A-0/S05
RELIANCE ELECTRIC BRUSHLESS SERVO MOTOR
TRANSFORMER 3HAC 6160-1
INDRAMAT PERMANENT MAGNET MOTOR MAC090A-0-ZD-4-C/110-A-0/W1524LV/S001
SIEMENS SERVO MOTOR 1FK7032-5AK71-1GG3
SIEMENS CONTROL CARD 580223.9101.01
FANUC TRANSFORMER A81L
ALLEN BRADLEY PC BOARD
ALLEN BRADLEY SERVO MOTOR 1326AB-B3E-11
ELAU SERVO DRIVE PMCK
ALLEN BRADLEY DRIVE 1370AR-BOA73-E REPAIR SERVICE
SIEMENS SERVO MOTOR 1FT6086-1AF71-1EG1
SIEMENS SERVO MOTOR 1FK7083-5AF71-1GG0
SIEMENS SERVO MOTOR 1FK7103-5AF71-1TA2
ALLEN BRADLEY DRIVE 1336-B005-E0D SER.A
GOULD CONTROLLER CARD AS-CREVA17
EMERSON DRIVE VISION 2 WA2101
DIRECT LOGIC 205 MODULE D2-16NA
RENCO ENCODER RHS15DCA18-LD-0-M2
BOSCH CONTROLER CARD SM 3,5/8-GC16
SIEMENS MICROMASTER 420 6SE6420-2UD25-5CA1
FANUC AC SPINDLE MOTOR A06B-0756-B210#3100
GETTYS PERMANENT MAGNET SERVO MOTOR
GARDNER-DENVER SERVOMOTOR 3BA927257
ALLEN BRADLEY DC CONTROLLER A
INDRAMAT AC SERVO DRIVE HDS05.2-W300N-HS12-01-FW
SIEMENS SERVO MOTOR 1FK7060-5AH71-1SH0
WESTINGHOUSE AB DE-ION CIRCUIT INTERRUPTER FB3100N
INDRAMAT AC SERVO CONTROLLER TDM 3.W1