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 SERVO MOTOR 1FT6086-1AF71-2EH1
FANUC BOARD A16BA
INDRAMAT AC SERVO COMPACT CONTROLLER DKS01.1-W100A-DS01-02-FW
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ABB MAGNET SERVO MOTOR T5C4DR1205
BER DRIVE 7DM465-7
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SYNCHRO MOTOR 86G-15S2
ISOLATED ANALOG INPUT MODULE *AS IT IS* 1771-IL C
SIEMENS SIMATIC S5 BUS MODULE 6ES5 700-8MA11
ALLEN BRADLEY KINETIX 6000 2094-AM01
ALLEN BRADLEY SMC-2 DRIVE 150-A35NB SERIES A
BALDOR AC MOTOR M3554T
ALLEN BRADELY AC RELAY 700-P200A1
ELECTRIC INDUSTRIES REGULATED DC POWER SUPPLY 4005
YASKAWA SERVO MOTOR SGMG-09V2ABB
ALLEN BRADLEY DRIVE 1336-B025-EJF-RP2
FANUC AC SERVO MOTOR A06B-0317-B272#7008
YASKAWA ELECTRIC CARD JANCD-MSP02
ALLEN BRADLEY SINGLE PHASE FILTER 2090-UXLF-123
INDRAMAT DRIVE DDS02.1-W050-D
INDRAMAT DIGITAL AC SERVO CONTROLLER DDS03.2-W050-B
MITSUBISHI SPINDLE DRIVE UNIT MDSASPA300
YASKAWA DRIVE *AS IT IS* JZRCR-NTU01B-2
INDRAMAT SERVO MOTOR MAC 090A-0-R0-4-C/110-A-1/W152
YASKAWA AC SERVO MOTOR SGMPS-02ACA21
SIEMENS SIMATIC S5 6ES5451-8MD11
SIEMENS SERVOMOTOR 1FT6108-8AF71-7TB0
INDRAMAT PERMANENT MAGNET MOTOR MAC112B-0-CD-1-B/130-A-0-J1250/S05
SIEMENS SIMATIC S5 6ES5 434-7LA11