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 AC SERVO CONTROLLER 1394C-AM07 SER C
SIEMENS SINAMICS CONTROL UNIT 6SL3040-1MA00-0AA0
TOSHIBA DRIVE VT130H7U4500B REPAIR SERVICE
MITSUBISHI INVERTER FR-A240E-2.2K
FANUC POWER UNIT A04B-0229-C401-01
ABB DRIVE ACSB
FANUC SERVO MOTOR A06B-0505-B
INDRAMAT SERVOMOTOR MKD071B-035-GG0-KN
SCHNEIDER AUTOMATION OUTPUT MODULE AS-BDAP-218, DAP 218
ALLEN BRADLEY I/O RACK 1774-SD
ALLEN BRADLEY PANELVIEW 2711-B6C1
ALLEN BRADLEY EXTRA TERMINALS FOR INPUTS 1492-IFM20F-F24A-2
SIEMENS SERVO MOTOR 1FK7100-5AF71-1GB2
SIEMENS SIMATIC S7 6ES7321-1FH00-0AA0
SEW EURODRIVE SERVO DRIVE 31C
NACHI AC SERVO MOTOR
ALLEN BRADLEY DRIVE 1370AR-BOB76-E REPAIR SERVICE
ALLEN BRADLEY DRIVE 1336S-C050-AN-EN REPAIR SERVICE
ALLEN BRADELY SERVO 1391-AA15-A12 CONTROLLER 1391
SIEMENS SERVOMOTOR 1FT5104-0AA01-2-Z
SIEMENS SERVO MOTOR 1FK7103-5AF71-1FA0
YASKAWA INVERTER VS-626M5
ALLEN BRADLEY DRIVE 1336-C020-EAE-L3
TOSHIBA POWER MODULE (IGBT) MG50G6EL1
SIEMENS SERVO MOTOR 1FT6086-1AH71-1AG1
SIEMENS SERVO MOTOR 1FT6105-8AF71-3EB0
ACTUS POWER AC SERVO MOTOR NA20-75F
INDARMAT MAC090C-1-GD-4-C/110-A-2/W/520LV/S013
SIEMENS SERVO MOTOR 1FT6086-1AF71-4AG1
THOMSON MICRON RIGHT ANGLE GEARHEAD NTRRM060-HMC
RELIANCE ELECTRIC SERVOMOTOR S-4030-P-H00AA
SEM SERVO MOTOR MT40W4-90
HITACHI BOARD BEJ
FANUC CONTROLLER CARD A16BA
HARLAND SIMON ANALOG INPUT CARD H4890P1209
INDRAMAT SERVO MOTOR MAC112C-0-HD-2-C/130-A-0
FIDIA CNC POWER SUPPLY +12V AF101