BI8U-Q10-AP6X2-V1131

BI8U-Q10-AP6X2-V1131

BI8U-Q10-AP6X2-V1131

BI8U-Q10-AP6X2-V1131

Allen-Bradley-22 1746-NI4    A

Allen-Bradley23 1736-RTB 配件

Allen-Bradley24 1737-RTB 配件

Allen-Bradley-24 1746-OW8    A

Allen-Bradley25 1734-RTB 配件

Allen-Bradley-25 1746-OW8    A

Allen-Bradley26 1794-IB10XOB6 配件

Allen-Bradley-26 1746-OW8    A

Allen-Bradley-27 1746-OW8    A

Allen-Bradley-28 1746-OW8    A

2　PLC的构成 

　　从结构上分，PLC分为固定式和组合式（模块式）两种。固定式PLC包括CPU板、I/O板、显示面板、内存块、电源等，这些元素组合成一个不可拆卸的整体。模块式PLC包括CPU模块、I/O模块、内存、电源模块、底板或机架，这些模块可以按照规则组合配置。 

3　CPU的构成 

　　CPU是PLC的核心，起神经中枢的作用，每套PLC至少有一个CPU，它按PLC的系统程序赋予的功能接收并存贮用户程序和数据，用扫描的方式采集由现场输入装置送来的状态或数据，并存入规定的寄存器中，同时，诊断电源和PLC内部电路的工作状态和编程过程中的语法错误等。进入运行后，从用户程序存贮器中逐条读取指令，经分析后再按指令规定的任务产生相应的控制信号，去指挥有关的控制电路。 

　　CPU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，CPU单元还包括外围芯片、总线接口及有关电路。内存主要用于存储程序及数据，是PLC不可缺少的组成单元。 

　　在使用者看来，不必要详细分析CPU的内部电路，但对各部分的工作机制还是应有足够的理解。CPU的控制器控制CPU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。运算器用于进行数字或逻辑运算，在控制器指挥下工作。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。 

　　CPU速度和内存容量是PLC的重要参数，它们决定着PLC的工作速度，IO数量及软件容量等，因此限制着控制规模。 

4　I/O模块 

　　PLC与电气回路的接口，是通过输入输出部分（I/O）完成的。I/O模块集成了PLC的I/O电路，其输入暂存器反映输入信号状态，输出点反映输出锁存器状态。输入模块将电信号变换成数字信号进入PLC系统，输出模块相反。I/O分为开关量输入（DI），开关量输出（DO），模拟量输入（AI），模拟量输出（AO）等模块。 

　　常用的I/O分类如下： 

　　开关量：按电压水平分，有220VAC、110VAC、24VDC，按隔离方式分，有继电器隔离和晶体管隔离。 

　　模拟量：按信号类型分，有电流型（4-20mA,0-20mA）、电压型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。 

　　除了上述通用IO外，还有特殊IO模块，如热电阻、热电偶、脉冲等模块。 

　　按I/O点数确定模块规格及数量，I/O模块可多可少，但其大数受CPU所能管理的基本配置的能力，即受大的底板或机架槽数限制。 

Allen-Bradley-29 1746-OW8    A

Allen-Bradley3 1734-MB 配件

Allen-Bradley-3 1747-L532   E

Allen-Bradley-30 1746-OW8    A

Allen-Bradley-31 1746-HSTP1  E

Allen-Bradley-32 1746-OA16   C

Allen-Bradley-33 1746-OA16   C

Allen-Bradley-34 1746-OA16   C

Allen-Bradley-35 1746-OA16   C

Allen-Bradley4 1734-MB 配件

Allen-Bradley-4 1747-L541   B

Allen-Bradley-42 1746-OB16   C

Allen-Bradley-44 1746-NIO4V  A

Allen-Bradley-45 1746-NIO4V  A

Allen-Bradley-46 1746-OBP16  C

Allen-Bradley-47 1746-OBP16  C

Allen-Bradley-48 1746-OBP16  C

Allen-Bradley-49 1746-OBP16  C

Allen-Bradley5 1734-MB 配件

Allen-Bradley-50 1746-OBP16  C

Allen-Bradley-51 1746-OBP16  C

Allen-Bradley-52 1746-IB32   C

Allen-Bradley-53 1746-IB32   C

Allen-Bradley-54 1746-IB32   C

Allen-Bradley-55 1746-IB32   C

Allen-Bradley-56 1746-OV16   B

Allen-Bradley-57 1746-IV16   B

Allen-Bradley-58 1746-IA16   D

Rare Miller Genuine Draft Electric Sign-12"x4.5" Great Condition w/roll switch

Vtg HI HO Santa Figure Riding Reindeer Light Up + Box Miller Electric # 819 (B)

MILLER ELECTRIC SC04.21 USPP SC0421

MILLER ELECTRIC 5251-S USPP 5251S

NEC 2002 Pocket Guide to Electrical Installations Under by Charles R. Miller...

100% Brand New! FREE Shipping! Buy with Confidence!

Tamiya Lola T94/00 Honda Rahal Hogen Miller Draft Body

MILLER ELECTRIC 195882 USPP 195882

Tamiya Vintage Rahal-Hogan Miller Genuine Draft MGD Body Set (50571) NIB

Miller Electric 604-517 Thermostat Deltaweld 451 $182

Miller Electric Furnace 5.4 kw Heating Element # 902820

Miller Electric Furnace 5 kw Heating Element # 902818

MILLER ELECTRIC 186549 NSFP 186549

Genuine Miller Electric Welder Reflex Pullover Black/Grey 3XL

Reactive Power Control in Electric Systems by T.J.E. Miller and T. J. E....

Miller Electric 234-237 Spoolmate 100 Series Spoolgun 12 ft Cable Assembly $167

Miller Electric Drive Gear 056094 15T $143 Wire Feeder

Miller Electric Drive Gear 056094 15T $143 Wire Feeder

MILLER Electric Switch 059-682 LIST $225 20 amp 125 volt OBSOLETE

Miller Electric Arc Welders Bluestar 1E Laser Cut Aluminum Control Plate, New

Miller Electric Arc Welders Bluestar 2E Laser Cut Aluminum Control Plate, New

MILLER ELECTRIC 200238 NSFP 200238

Genuine Miller Electric Welder Fleece Hoodie Black 2XL

Genuine Miller Electric Welder Vintage Track Jacket Maritime Blue 2XL

Genuine Miller Electric Welder Reflex Pullover Black/Grey 2XL

Miller Electric Resistor 028-840 LIST $130

MILLER ELECTRIC 109006 NSFP 109006

Genuine Miller Electric Welder Fleece Hoodie Black L or XL

Genuine Miller Electric Welder Vintage Track Jacket Maritime Blue L or XL

Genuine Miller Electric Welder Reflex Pullover Black/Grey XL

MILLER FALLS Co. # 50-R MODEL C 115 VOLT ELECTRIC DRIVER 

Miller Electric Resistor Unknown Part AVE-300 10P

Genuine Miller Electric Welder 3 x 5 Nylon Flag

Miller Electric Drive Roll Kit 057-715 $152 3/32 U

Genuine Miller Electric Welder Northland Fleece Jacket 2XL

MILLER TOOL 6807 ELECTRICAL TERMINAL PICK TOOLS NEW

ELECTRICITY AND ELECTRONICS FOR HVAC - MARK R. MILLER REX MILLER (PAPERBACK) NEW

INDUSTRIAL ELECTRICITY AND MOTOR CONTROLS - REX MILLER (PAPERBACK) NEW

Genuine Miller Electric Welder Northland Fleece Jacket M, L or XL

vintage MILLER FALLS 1/2" electric drill 712C, brass tag

MILLER ELECTRIC 119929 (5PCS)

Vintage Antique Miller Oil Electric Table Lamp

Miller, Intertherm, Nordyne Electric Furnace 10 x 8 Blower Wheel Part # 667037

c1950 Vintage Electric MILLER HIGH LIFE Champagne of Bottle Beer Sign SPARKLING

NEW Miller Electric Ultra Fast Recover Diode Kit 151431 #30703

NEW Miller Electric Diode Kit 147947 Fast Recovery #30705

NEW Miller Electric Diode Kit 149215 Fast Recover #30706

Miller's General Electric Animated Neon Sign O/HO Scale

Miller Electric wire feed display module

Miller 120V 125-Watt Electric Heater Base For Galvanized Poultry Waterer

Miller - MEN AND VOLTS AT WAR General Electric in WWII