与通用计算机一样，主要由运算器、控制器、寄存器及实现它们之间联系的数据、控制及状态总线构成，还有外围芯片、总线接口及有关电路。它确定了进行控制的规模、工作速度、内存容量等。内存主要用于存储程序及数据，是PLC不可缺少的组成单元。
控制器控制工作，由它读取指令、解释指令及执行指令。但工作节奏由震荡信号控制。
的运算器用于进行数字或逻辑运算，在控制器指挥下工作。
的寄存器参与运算，并存储运算的中间结果，它也是在控制器指挥下工作。
虽然划分为以上几个部分，但PLC中的芯片实际上就是微处理器，由于电路的高度集成，对内部的详细分析已无必要，我们只要弄清它在PLC中的功能与性能，能正确地使用它就够了。
OMRON 3G2A5-LK201-V1 HOST LINK UNIT C500 LK201 V1
GE FANUC 90-30 ANALOG INPUT IC693ALG220F
ALLEN BRADLEY 1305-BA03A VFD 1 HP 480V 1201-HA2 HIM?
TSB151 TSUBAKI SHOCK RELAY
FUGI ELECTRIC 225 AMP CIRCUIT BREAKER MODEL BU-JSB 600V
A.O. SMITH 1/4 HP COMBUSTION BLOWER MOTOR FOR AAON RTU
ALLEN BRADLEY 1746-NIO4V COMBINATION ANALOG I/O MODULE
ALLEN BRADLEY 1734D-IB8X0W8 POINT I/O 1734DIB8X0W8 NEW
SENSOTEC IN-LINE AMPLIFIER PART# 060-6827-06?
KJ30001X1-BC1 FISHER ROSEMOUNT DI MODULE NEW IN BOX
KJ3001X1-BK1 FISHER-ROSEMOUN?T DO MODULE NEW IN BOX
KJ3001X1-BH1 FISHER-ROSEMOUN?T DO MODULE NEW IN BOX
TEMPOSONICS G-SERIES LINEAR TRANSDUCER GHT0050UD601V0?
ALLEN BRADLEY 1747-L532 SER. D CPU 5/03 ?W/ 1747-M11
57701-481 DURANT DIGITAL BIDIRECTIONAL COUNTER NEW?
RAYTEK INFRARED TEMPERATURE SENSOR MODEL RAYET3LTSF NEW
OMRON DRT2-ROS16 REMOTE TERMINAL 24 VDC?
PMI MOTION TECHNOLOGIES 0088056001 TYPE VXA 48-8-16
PINNACLE SYSTEMS INC. MICROGUARD MG-24-24-AB-20-?SC?
03900-A1-A01-07 IEE INTEGRATED DISPLAY KEYBOARD SYSTEM
CENCO VACUUM PUMP 1/2 HP 115 VAC CAT# 91142?
KJ3001X1-BD1 FISHER ROSEMOUNT DI MODULE NEW IN BOX
FUGI ELECTRIC 250 AMP CIRCUIT BREAKER MODEL BU-KSB 600V
A16B-1210-0020 FANUC BOARD FOR RF NEW
ALLEN BRADLEY 1784-KTX SER. B COMMUNICATIONS INTERFACE
YOKOGAWA DARWIN COMMUNICATIONS LINK DA100-D STYLE S8
ALLEN BRADLEY 100-B110NZ*3 CONTACTOR 75 HP 120V COIL
NORDSON 273378E HOT MELT GLUE HOSE GLUE MACHINE NEW
HELM INSTRUMENT CO. INC. 10,000 LB. LOAD CELL ILS-H10
SENSOTEC JEC LINEAR TRANSDUCER PN# 060-H032-02
OMRON 3G2A5-LK201-V1 HOST LINK UNIT C500 LK201 V1
GE FANUC 90-30 ANALOG INPUT IC693ALG220F
ALLEN BRADLEY 1305-BA03A VFD 1 HP 480V 1201-HA2 HIM?
TSB151 TSUBAKI SHOCK RELAY
FUGI ELECTRIC 225 AMP CIRCUIT BREAKER MODEL BU-JSB 600V
A.O. SMITH 1/4 HP COMBUSTION BLOWER MOTOR FOR AAON RTU
ALLEN BRADLEY 1746-NIO4V COMBINATION ANALOG I/O MODULE
ALLEN BRADLEY 1734D-IB8X0W8 POINT I/O 1734DIB8X0W8 NEW
SENSOTEC IN-LINE AMPLIFIER PART# 060-6827-06?
KJ30001X1-BC1 FISHER ROSEMOUNT DI MODULE NEW IN BOX
KJ3001X1-BK1 FISHER-ROSEMOUN?T DO MODULE NEW IN BOX
KJ3001X1-BH1 FISHER-ROSEMOUN?T DO MODULE NEW IN BOX
TEMPOSONICS G-SERIES LINEAR TRANSDUCER GHT0050UD601V0?
ALLEN BRADLEY 1747-L532 SER. D CPU 5/03 ?W/ 1747-M11
C120-OD412 OMRON TRANSISTOR OUTPUT MODULE NEW
PARKER HYDRAULIC VALVE D1VW1CNYCF56 NEW
PARKER HYDRAULIC PRESSURE REDUCING VALVE PRDM2PP16LNS?
SANYO DENKI STEPSYN 103H8222-6540 STEPPER MOTOR ROBOTIC
11-BHW-48SV/F63?9 CLIFTON PRECISION BRUSHLESS RESOLVER
5003-N12 CINCINATTI ELECTROSYSTEMS OPERATOR DISPLAY NEW
GE FANUC COMMUNICATIONS CONTROL MDL IC693CMM311F
FC1A-D1A1E IDEC MICRO-1 MICRO CONTROLLER NEW
REGENT’S CONTROLS INC. WATCHGUARD 120 SENSING RELAY NEW
SCAIME LOAD CELL AMPLIFIER MDL# CMJ-CE NEW
3G2A5-OA121 OMRON OUTPUT UNIT
