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。
FUNUC CONTROLLER CARD A16BF
SCHIMPRE FILTER DK 48 V
SIEMENS MODULE 6FX1111-1AA01
SERVO MOTOR AC-SM
SIEMENS MOTOR 1FK7060-2AF71-1CH2
SIEMENS DC INVERTER 6SE7023-4TC61-Z
SIEMENS SERVO MOTOR 1FK7080-5AH71-1SG3
FANUC SERVO AMPLIFIER A06B-6088-H226#H500
ALLEN BRADLEY SERVO MOTOR 1326AB-C2E-11-A7
SIEMENS SIMATIC S7 PLC MODULE 6ES7 322-1BL00-0AA0
SIEMENS DRIVE 6FC5247-0AA00-0AA2
INDRAMAT PERMANENT MAGNET MOTOR MDD112C-N-030-N2L-130PB2
YASKAWA AC SERVO MOTOR,SGMGH-30ACA6E
SIEMENS SERVO MOTOR 1FT6044-1AF71-2EH1
SIEMENS 3 PHASE MOTOR 1FK7040-2AK71-1CB2
CONTROL TECHNIQUES M441C
RELIANCE ELECTRIC UNIVERSAL DRIVE MODULE
FANUC AC SERVO MOTOR A06B-0143-B175
ALLEN BRADLEY DRIVE 1336-B015-EAF-L1
ALLEN BRADLEY INPUT MODULE 1746-1B32
MITSUBISHI SERVO DRIVE FR-A540-1.5K-NA
CONTROL TECHNIQUES COMMANDER CD DRIVE CD 220K
GOULD REMOTE I/O PROCESSOR CONTROLLER CARD PCB SREV B1
APEX DYNAMICS GEARBOX AE090
SIEMENS SERVO MOTOR 1FK7063-5AF71-1GG0
INDRMAT INTERFACE CARD DSS2.1
KEB COMBIVERT DRIVE 07.F4.S1D-3420
ALLEN BRADLEY HIGH RESOLUTION ANALOG MODULE 1771-NIS SER A
FANUC A06B-6122-H045#H553 Spindle Amplifier
CINCINNATI MILACRON OUTPUT BOARD FEEDRATE CONTROL INTERFACEA
INDRAMAT DKR02 DRIVE DKR02.1-W300N-BE12-01-FW
FANUC BOARD A16BF
SIEMENS SERVO MOTOR 1FK7083-5AF71-1SB0
ALLEN BRADLEY POWER FLEX 70 20A E 3P9A 0 AYNNNNN
VEXTA AS SERVO DRIVE X
YASKAWA SERVOMOTOR SGMGH-44A2A-YR13
FANUC SERVO AMPLIFIER A06B-6088-H226#H500