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 OUTPUT MODULE 1771-OWNA
CINCINATI MILACRON MOTOR 1PH6161-4NF00-Z
WESTINGHOUSE MOTOR CIRCUIT PROTECTOR HMCP030H1C
SERVO Drive MOOG 152D423A-1
MITSUBISHI SERVO DRIVE MDS-B-V1-35
SIEMENS CONTROLLER CARD 65C5111
SIEMENS SERVO MOTOR 1FK7080-5AF71-1SH5
SIEMENS DRIVE 6SN1123-1AA00-00A0
SIEMENS SIMATIC S7 6ES7315-2AF03-0AB0
FANUC BOARD A16BE
SIEMENS SERVO MOTOR 1FK7083-5AH71-1TA3
ALLEN BRADLEY DRIVE 1370AR-AOB74-E REPAIR SERVICE
SUPERCOOL SERVO DRIVE DAAR
ALCATEL CONVERTERS SUP 11 3AW00388AAAA
ALLEN BRADLEY DRIVE 1336-B015-ECE-L2
CONTROLLER CARD
SIEMENS SERVO MOTOR 1FT6105-1AC71-2EG1
SIEMENS SINAMICS 30 A SINGLE AXIS DRIVE 6SL3120-1TE23-0AA3
INDRAMAT BOARD PCU4.2D-16E-50C-AA-GL
SIEMENS SIMATIC S7 63S7323-1BH01-0AA0
YASKAWA SERVOMOTOR SGMDH-06A2A-YR25
SIEMENS SERVO MOTOR 1FK7080-5AH71-1GH3
SIEMENS CONTROLLER CARD 6SC6500-0UC00
BINDER BRAKE 86 61109H49
ALLEN BRADLEY KINETIX 6000 2094-AM01
INDRAMAT DOUBLE AXIS DRIVE HMD01.1N-W0012
CINCINNATI MILACRON 3000 PROCESSOR A
EATON TRANSFER SWITCH MODULE RLC1SEJ20200WRU
ALLEN BRADLEY 1774-LB2 PROCESSOR MODULE AS IS
SIEMENS SERVO MOTOR 1FK7060-5AF71-1TB0
ALLEN BRADLEY DC CONTROLLER 1387-B-B0A080-B39-A2-B SER. B
ESCORT MEMORY SYSTEMS PROFIBUS MODULE CM31
SIEMENS SERVO MOTOR 1FK7103-5AF71-1TG3
INDRAMAT AC SERVO POWER SUPPLY KDV 4.1-30-3
SIEMENS SERVO MOTOR 1FK7083-5AH71-1EB0
ALLEN BRADLEY DRIVE 1336S-B010-AN-EN
SIEMENS MICROMASTER 420 6SE6420-2UD24-0BA1