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 STARTER 509-C0D
SIEMENS CENTRAL PROCESSING UNIT T1315-DR
GETTYS PERMANENT MAGNET SERVO MOTOR
EUROTHERM 590 DIGITAL SERIES DRIVE 591C
YASKAWA AC SERVO MOTOR USASEM-30AC2K
SIEMENS SERVO MOTOR 1FT5046-0AC01-9-Z
ELAU SERVO MOTOR SMP0-44-S1-B0
SIEMENS BRUSHLESS SERVO MOTOR 1FT5046-1AF71-3EB0
SIEMENS SERVO MOTOR 1FK7103-5AF71-1EA2
INDRAMAT CONTROLLER CARD B29-02
SIEMENS CONTROLLER CARD 6SN1118-1NH00-0AA2
ALLEN BRADLEY AC SERVO MOTOR MPL-A320P-VJ42AA
WOOD'S E-TRAC AC INVERTER AFC2003.OB2S
ALLEN BRADLEY OPERATOR INTERFACE 6180-DHCEFGAHEBZ
FANUC BOARD A16B
KOLLMORGEN SERVO MOTOR M-203-B-23
SIEMENS SERVO MOTOR 1FK7101-5AF71-1EA2
YASKAWA AC SERVO MOTOR SGML-04AF14
PACIFIC SCIENTIFIC BRUSHLESS SERVO MOTOR R32HENC-R2-NS-NV-00
ALLEN BRADLEY DRIVE 1370AR-BOA74-E REPAIR SERVICE
SIEMENS PANELVIEW 6FC5210-0DF20-0AA0
SIEMENS SERVO MOTOR 1FT6062-1AF71-1EH1
FANUC CONTROLLER CARD A20BA
SIEMENS S7-200 I/O MODULE 6ES7 223-1BL22-0XA0
SIEMENS SINUMERIK IK DMP 16 E-MODUL COMPACT 6FC5111-0CA01-0AA0
ALLEN BRADLEY BULLETIN 2094 9A AXIS MODULE 2094-BM01
ALLEN BRADLEY TTL OUTPUT MODULE 1771-OG
FANUC AC SERVO MOTOR A06B-0236-B200
FANUC SERVO DRIVE SPINDLE AMPLIFIER A06B-6059-H003#H503
FANUC SERVOMOTOR A06B-0371-B577#7008
FANUC PULSE CODER 2000P AV541
OMNI VISION CRT E144C-AK-REV.B
ABB SERVO MOTOR 3HAB4040-1
ALLEN BRADLEY SERVOMOTOR 1326AS-B460F-21-K4
SIEMENS SERVO MOTOR 1FK7032-5AK71-1TG0
YASKAWA ELECTRIC CARD JANCD-MFC06
FANUC PULSE CODER AT001