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 3 PHASE AC DRIVE 1336-B015-EAE-S1
ABB ROBITICS SERVO MOTOR PSP-LSS-4303, 3HAC ART NO: B
SIEMENS DRIVE G85139-H1750-C837-A
SIEMENS SERVOMOTOR 1FT6041-4AF71-4DA0
SIEMENS SERVO MOTOR 1FT6062-1AH71-4EH1
ABB SERVO DRIVE ACSB
ALLEN BRADLEY DC SERVO CONTROLLER 1388B-AV10
MITSUBISHI AC SERVO MOTOR HC-KFS43K
ALLEN BRADLEY DRIVE 1336-B020-ECE-L2
SIEMENS SERVOMOTOR 1FK7063-5AF71-1AH2
OPUS7000 UNIVERSAL COMPACT MAIN BOARD EF
TSX QUANTUM MODULE 140 CPS 114 10
KOLLMORGEN GOLDLINE SERVO MOTOR MTC7206B1-R1C1
SIEMENS PLC MODULE 6ES7 321-1BH02-0AA0
SIEMENS SERVO MOTOR 1FK7083-5AF71-1AH5
MOOG WIN DRIVE TA-17-H1-2-2A
INDRAMAT SERVO MOTOR MHD112B-048-PGO-AN
SIEMENS SIMODRIVE 1P 6SN1123-1AA01-0FA1
PROFACE SCREEN
ALLEN BRADLEY 2711-B6C5 Panelview
SIEMENS SERVO MOTOR 1FK7101-5AF71-1AB3
DURA DRIVE HDC01.1-A040N-IB01-01-FW
ALLEN BRADLEY DRIVE 1336-B030-EAF-L2
FANUC AC SERVO MOTOR A06B-0512-B504
BOSCH SERVO DRIVE KM1100-T
INDRAMAT AC MAINSPINDLE DRIVE KDA 2.AP0-U1/115
FANUC CONTROLLER CARD A16BA
ALLEN BRADLEY DRIVE 1336-C020-EJE-S1
ALLEN BRADLEY PANALVIEW 2711-T5A8LT
ALLEN BRADLEY PLC PROCESSOR MODULE 1785-L20E
MISUBISHI SERVO DRIVE FR-Z240-30K-UL REPAIR SERVICE
MITSUBISHI SERVO MOTOR HC-SF102
AEG MODICON SERVOMOTOR
SIEMENS SERVO MOTOR 1FK7080-5AH71-1SH5
GETTYS PERMANENT MAGNET DC SERVO MOTOR M235-YY0A-300S-PD
FANUC SERVOMOTOR A06B-0652-B011
SIEMENS SERVO MOTOR 1PH7133-2EG00-0DA3-Z