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。
FANUC CFU UNIT A04B-0234-C407
INDRAMAT SERVO DRIVE DKC01.FW
ALLEN BRADLEY POWER SUPPLY *AS IT IS* 1746-P1
ABB INDUSTRY BRAKE MODULE ACS-BRK-C
GE FANUC AC SERVO MOTOR A06B-0317-B
FANUC BOARD A20BD
FANUC BOARD A16BA
ELAU MOTOR SMP1-45-S1-B0
HARLAND SIMON BOARD H4890P1523
FANUC POWER MATE MODEL A02B-0166-B531
SIEMENS CONTROLLER CARD 6DD1601-0AE0 PG16
BALDOR SERVO DRIVE VS1SP560-1B REPAIR SERVICE
SIEMENS MOTOR 1FT5074-0AC01-9-Z
EATON IDT MODULE
KILLARK PUSHBOTTON 601-KX1C
INDRAMAT MEMORY CARD FWC-HSM1.1-ELS-05V20-MS
LENZE/ AC TECHNOLOGY DRIVE L12500D REPAIR SERVICE
TSUBAKIMOTO CHAIN CO. SHOCK RELAY TSB151
SIEMENS SERVO MOTOR 1FK7060-5AH71-1AH3
EAGLE SIGNAL TIMER CX312A6
OKUMA E0 OPUS 5000 BOARD EC
KOLLMORGEN SERVO MOTOR EN EN E61960, E PS155-1
ALLEN BRADLEY DRIVE 1336E-B050-AA-EN
KUKA CONTROL CARD FE
HEIDENHAIN ENCODER EQN 1325.
RADIANCY SKIN STATION
FANUC AC SERVO MOTOR A06B-0502-BR
HITACHI CONTROLLER CARD BEM
INDRAMAT SERVO DRIVE HDS04.2-W200N-HS12-01-FW
INDRAMAT SERVO MOTOR MDD093C-N-040-N2M-130PA1
TAMAGAWA TS2630N91E78 RESOLVER
SIEMENS SERVO MOTOR 1FK7083-5AH71-1GH5
ACOPOS PLUG IN ENDAT ENCODER INTERFACE MODULE 8AC120.60-1
SIEMENS SERVO MOTOR 1FK7101-5AF71-1EG0
SIEMENS SERVOMOTOR 1FK7083-5AF71-1EH0
SIEMENS SERVO MOTOR 1FK7100-5AF71-1EH3
SCHNEIDER MODICON 140NOM21100