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。
OMRON UNIT C200H-AD003
INDRAMAT PROGRAMMING MODULE MOD1/1X
LENZE/ AC TECHNOLOGY DRIVE L15400D REPAIR SERVICE
YASKAWA MOTOMAN 6 AXIS SERVO CONTROLLER CACR-SV3AAA
ALLEN BRADLEY BULLETIN 1392 HIGH PERFORMANCE AC DRIVE 1392-B040-RF-MC-A-D1-F1-F4
SIEMENS POWER SUPPLY 6SC 6110 7VA01
SIEMENS SERVO MOTOR 1FK7042-5AF71-1AA0
ALLEN BRADLEY SLC 500 PROCESSOR UNIT 1747-L541 SER.B
ABB DRIVE ACS
ALLEN BRADLEY POWER SUPPLY 1606-XL120D
MODULAR INDUSTRIAL COMPUTERS INC. HMI TOUCH SCREEN FP1500M
ALLEN BRADLEY PLC PROCESSOR MODULE 1785-L20E
MODICON CYBERLINE 1000 CLV
FANUC SERVO MOTOR A06B-0273-B000#0100
SIEMENS SERVO MOTOR 1FK7103-5AF71-1TA3
SEW EURODRIVE BRAKE FILTER EF
LENZE SERVO DRIVE E82EV152
ABB ROBOTICS SERVO MOTOR,PSP-LSS-4101
ALLEN BRADLEY POWERFLEX 4M SERIES A 22F-A4P2N113
ALLEN BRADLEY SLC500 INPUT MODULE 1746-IB32 SER C
ALLEN BRADLEY DRIVE 1336-C020-EJE-S1
ALLEN BRADLEY DRIVE 1336VT-B050-EAS-L3 REPAIR SERVICE
CONTROL TECHNIQUES SERVODRIVE EN-208
INDRAMAT CONTROLLER CARD B09-06
BINDER BRAKE 86 61114H07
ALLEN BRADLEY SERVO MOTOR 1326AB-B720F-21-K7
FANUC SERVO MOTOR A06B-0513-B005
HARLAND SIMON BOARD H4890P1523
SIEMENS SERVO MOTOR 1FK7100-5AF71-1EA0
SIEMENS SERVO MOTOR 1FT6105-8AF71-4AB0
ELAU SERVO DRIVE MC
CUTLER HAMMER ON DELAY TIMER D87AE A1
FANUC BOARD A16BC
MITSUBISHI PROGRAMMABLE CONTROLLER FX-4AD
SIEMENS SERVO MOTOR 1FT5064-1AF71-4EB0
SIEMENS SERVO MOTOR 1FT6086-1AH71-2EH1
FANUC AC SERVO MOTOR A06B-0123-B175