PLC基本组成包括中央处理器(CPU)、存储器、输入/输出接口(缩写为I/O，包括输入接口、输出接口、外部设备接口、扩展接口等)、外部设备编程器及电源模块组成，见图1。PLC内部各组成单元之间通过电源总线、控制总线、地址总线和数据总线连接，外部则根据实际控制对象配置相应设备与控制装置构成PLC控制系统。
Used Dyson DC14 Upright Lock Assembly
Denso 3rd Axis Robot Servo Motor, MQM042T2U,
Sick Light Curtain Receiver, # MGSE30-12A,
OEM Genuine Ricoh V
ATC 319D 134 Q 1C Time Delay Relay Timer 120 VAC 319 3.Ranger Free Shipping!
Honeywell L4064K1014 Limit Control 11 1/2" Insertion, 3/4" Diameter 165F
ASEA Combiflex RXMA 1 Relay RK 211 037-AD Free Shipping RKAD
Fuji FRC-200 Servo Amplifier
Epic Circuit Board PCB Rev. HC Free Shipping!
Reliance Electric Automate Register Input, 45C380,
REPAIRED Static Sealed GE Fanuc A16BC Axis Control Board
Airgas Y11-LC241D320 Specialty Gas Line Regulator 1200 PSIG Inlet/100 PSIG Out
E-Lux PCB Assembly w/ Display, #
Setra 227 Pressure Transducer PAE52CD1M SEALED
Mitsubishi M/C Operation Board, Mazatrol 640M, FCU6-YZN31 W/ LCD DISPLAY,
Kellems Hubbell Cord/Cable Grip Strain Relief 1" NPT for 1/2" Cable
SMC CDQ2B40-10TM-A73 Pneumatic Compact Cylinder Free Shipping!
Numatics 152SA402E Valve good condition SEE DESCRIPTION
Ingersoll Rand D.C. Servo Drive, # D.C. Motor Systems,
Parker Schrader Bellows LV41A Lockout Valve Free Shipping!
Omron CQM1-ID213 PLC Input Unit, 30 Day Warranty
Mitsubishi Power Supply Panel Board Unit, HS-2700VE-B,
Fanuc PCB Ram Module Daughter Board, A20BA,
Toei Electric Drive Unit, VLPD-5010A,
GE Fanuc IC610MDL129A 115 VAC Input Module 16 Circuits PLC Free Ship
Fabco Air The Pancake Line Pneumatic Cylinder TE-121-X-PM Excellent Condition
Midland Ross Relay 157-23B2M4 Dayton 5X837F Free Shipping! 12 VDC Coil
Taiyo YS211 Proximity Switch Free Shipping!
OEM Genuine IBM Ricoh 39V2239 Magenta Toner Cartridge SEALED