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。
SIEMENS CONTROLLER CARD 6FC5110-0DB02-0AA2
CUTLER HAMMER SVX9000 SVX005A1-5A4B1
FANUC SERVO DRIVE A06B-6066-H291
EMERSON SERVO DRIVE FX-8200
ALLEN BRADLEY DRIVE 1336F-BRF100-AN-EN REPAIR SERVICE
FANUC CONTROLLER INOUT MODULE A1AB-0061-B102
NACHI SERVO DRIVE RBX1100
CONTROL TECHNIQUES SERVO MOTOR 142DSB301CAAAA
GENERAL ELECTRIC AC INDUCTION MOTOR
MOOG J
SIEMENS SERVO MOTOR 1FK7083-5AF71-1TA5
SIEMENS INCREMENTAL ENCODER ROD 426B.016
BER DRIVE 7CP
SIEMENS SERVOMOTOR 1FT6132-6AF71-4AB0
ALLEN BRADLEY PLC PROCESSOR MODULE, 1785-L40B/C
ALLEN BRADLEY DRIVE 1336, GT-BB25,
SIEMENS SERVO MOTOR 1FK7060-5AH71-1GA5
SIEMENS SERVO MOTOR 1FT6084-1AF71-3EH1
SIEMENS SERVO MOTOR 1FT6086-1AH71-2EH1
FUJI ELECTRIC RELAY SRC50-2U/K
LUTZE MODULE 743204
FANUC A05B-2301-C370 Teach Pendant
FANUC SPINDLE SERVO DRIVE A06B-6041-H112
SIEMENS SERVO MOTOR 1FK7103-5AF71-1AA0
Allen Bradley 1746-OA16 Output Module
PROFACE OPERATOR INTERFACE GP570-TC21-24VP
VEXTA DISPLAY UNIT OPX-1
ABB SERVO DRIVE DR0004
SOLA COPPER LINE DC POWER SUPPLY 39-409
ALLEN BRADLEY DC CONTROLLER 1387-B-B0A090-B32-AB-SPD18266 SER. B
ABB DRIVE 3HABB , DSQC345B
ALLEN BRADLEY PANELVIEW 600 2711P-B6C20D
SIEMENS SERVO MOTOR 1FK7063-5AH71-1EH5
ALLEN BRADLEY DRIVE 1336-B040-EJG-L1
ABB ROBOTICS SERVO MOTOR PS T-PMB-3708
SBC SERVO MOTOR MBA1164
ALLEN BRADLY DRIVE 1394-SJT05-A SER A