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 OEM PLATFORM MODULE 1771-OEM1 SER A
MISUBISHI SERVO DRIVE FR-SF-2-11K-PHTC REPAIR SERVICE
SIEMENS SERVOMOTOR 1FK7022-5AK71-1LH3-Z
AC TECH VARIABLE SPEED AC MOTOR DRIVE Q14075B
SIEMENS DIGITAL INPUT MODULE (SP) 6ES5434-7LA11
ALLEN BRADLEY 1336 DRIVE 1336-C007-EAD
MAGNA PRODUCTS DC SERVO MOTOR MA-591
FANUC AC SERVO MOTOR A06B-0235-B605
INDRAMAT CONTROLLER TDM 2.W0/S0101
FANUC SERVO MOTOR A06B-0512-B001
TB WOODS AC INVERTER WFC4020-0CHT
SIEMENS SERVO MOTOR 1FT6084-1AF71-3EG1
CONTROL TECHNIQUES COMMANDER CDE DRIVE CDE075-R
SUN MICROSYSTEM DPS-680CB A REV
ALLEN BRADLEY AC SERVO MOTOR 1326AB-B730E-21
FANUC POWER SUPPLY A06B-6081-H103
INDRAMAT OPERATOR INTERFACE BTV30.2CA-64R-11C-D-FW
CINCINNATI MILACRON DC INPUT BOARD 3-531 3561A
SIEMENS SERVO MOTOR 1FT6062-1AH71-2EH1
FANUC MODEM MODULE IE
ABB DRIVE ACS800-U
ALLEN BRADLEY DRIVE 1370AR-BOB67-E REPAIR SERVICE
SIEMENS VARIABLE SPEED AC MOTOR DRIVES Q35008B
ALLEN BRADLEY DRIVE 1336-C040-EJG-L1 REPAIR SERVICE
FANUC SERVO AMPLIFIER A06B-6117-H302
HANCHEN HYDRAULIC 120
CTC PARKER P91-5JB-1A0H-4A2
INDRAMAT SERVOMOTOR MAC112D-0-HD-3-C/130-A-2/S013
SIEMENS SIMATIC OPERATOR PANEL 6AV3627-1JK00-0AX0
OKUMA SERVO DRIVE BLII-D30A
YASKAWA SERVOPACK CACR-U1R010101FD
FANUC DC MOTOR A06B-0642-B011
OMRON CPU BASE UNIT C200H-BC081-V2
EATON CORPORATION DRIVE AF95AG0C040VLL8 REPAIR SERVICE
BALDOR A.S.R SERVO MOTOR BSM6RA9-A10-701
FANUC SERVO MOTOR A06B-0502-B755
ALLEN BRADLEY PANELVIEW 2711-K9C9