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 POWERFLEX 4 LINE FILTER 22-RF021-BL SER A
ALLEN BRADLEY CONTROL LOGIX INPUT MODULE 1756-IA16/A PART NO: C01
ALLEN BRADLEY PANELVIEW 2711-B6C1
SIEMENS SIMATIC POWER SUPPLY 6ES5951-7NB21
SIEMENS SERVO MOTOR 1FK7060-5AH71-1AG0
INDRAMAT CLM DRIVE CLM01.3-XFW
HEIDENHAIN ENCODER EQN 1325.
ALLEN BRADLEY 4 SLOT RACK 1746-A4 SER B
LENZE INVERTER E82EV222_2C
FANUC AC SERVO MOTOR A06B-0313-B072-R
TELEMECHANIQUE DRIVE ATV31HU22N4
FANUC AC SERVO MOTOR A06B-0377-B175
ELECTRONIC BALLAST FOR LVD INDUCTION LAMP 200W LVD-DQ-F120V/60HZ-200W
ABB ROBOTICS SERVO MOTOR 1FT3034-5AZ21-9-Z
INDRAMAT CONTROLLER CARD A21-05
GEAR BOX LP050-M01
ALLEN BRADLEY POWER SUPPLY 1771-P2
SIEMENS SERVO MOTOR 1FK7022-5AK71-1GH5
SIEMENS SERVO MOTOR 1PH6130-4NF00
FANUC BOARD A16BA
ALLEN BRADLEY BULLETIN 2094 9A AXIS MODULE 2094-BM01
PACIFIC BRUSHLESS SERVO MOTOR R35KEAC-R2-NS-NV-00
ALLEN BRADLEY DRIVE 1336F-BRF150-AN-EN
CONTROL TECHNIQUE VARIABLE INVERTER CDE 400
SIEMENS 2 AXIS SIMODRIVE 6SN1123-1AB00-0BA2
PACIFIC SCIENTIFIC MOTOR AND CONTROL DIVISION H33NLHB-LNW-NS-00
SQUARE D ELECTRICAL INTERLOCK SWITCH KIT EK1020-1
YASKAWA AC SERVO MOTOR SGMGH-13ACA61
YASKAWA SERVOMOTOR SGMRS-13A2A-YR11
ALLEN BRADLEY 22B-D2P3N104
ALLEN BRADLEY AC DRIVE 1336F-C050-AN-EN SER B
ALLEN BRADLEY PANELVIEW 2711-K9C9
PARKER COMPUMOTOR CM233XE-00148
SIEMENS SERVO MOTOR 1FT6034-1AK71-1AG1
ALLEN BRADLEY SERVO MOTOR MPL-A420P-MJ22AA
SIEMENS 3 PHASE LINE REACTOR CHOKE 6SN1111-0AA00-0BA1
YASKAWA SERVOPACK CACR-SR30SZ1SDY173