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1. PLC的硬件结构

可编程控制器主要由*处理单元(CPU)、存储器(RAM、ROM)、输入输出单元(I/O)、电源和编程器等几组成。PLC硬件结构如图1所示：　

图1 PLC硬件结构

2. *控制处理单元(CPU)

可编程控制器中常用的CPU主要采用通用微处理器、单片机和双极型位片式微处理器三种类型。

通用微处理器有8080、8086、80286、80386等；单片机有8031、8096等；位片式微处理器的AM2900、AM2903等。FX2可编程控制器使用的微处理器是16位的8096单片机。

3. 存储器

可编程控制器配有两种存储器：系统存储器和用户存储器。

系统存储器：存放系统管理程序。

用户存储器：存放用户编制的控制程序。

4. 输入接口电路

PLC通过输入单元可实现将不同输入电路的电平进行转换，转换成PLC所需的标准电平供PLC进行处理。

接到PLC输入接口的输入器件是：各种开关、按钮、传感器等。各种PLC的输入电路大都相同，PLC输入电路中有光耦合器隔离，并设有RC滤波器，用以消除输入触点的抖动和外部噪声干扰。PLC输入电路通常有三种类型：直流(12∽24)V输入、交流(100∽120)V输入与交流(200∽240)V输入和交直流(12∽24)V输入

HYDAC BETAFIT 1.06.39D03BN HYDRAULIC FILTER ELEMENT, NIB

NORGREN 175oF, 300PSIG, REGULATOR R24-401-RNXA

FESTO 32MM BORE 250MM STROKE PNEUMATIC CYLINDER, DNU-32-250-PPV-?A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B50B-?PD-EK

SMC CYLINDER CDNAFN80N-100-D?-J59WLS

LUBRIQUIP PUMP ASSEMBLY AL-25, 521-000-020, L-90

FESTO 63MM BORE 50MM STROKE PNEUMATIC CYLINDER, DKE-63-50-PPV-A

MAC 24 VDC 6.0W SOLENOID VALVE 280B-506AAAA

SMC 50MM BORE 200MM STROKE PNEUMATIC CYLINDER CNAFN50N-200-D

YUKEN HYDRAULIC CYLINDER CJT70-FA32B600B?-BAD

BI * BI UNION FITTING * UNKNOWN

FESTO 40MM BORE 400MM STROKE PNEUMATIC CYLINDER, DNC-40-400-PPV-?A, NNB

PARKER P11771 -20-20 CRIMP FITTING SAE CODE 61 FLANGE HEAD 45 ELBOW

YUKEN CYLINDER CJT70-FA80B80H-?CBA-N 2012-411A

MAC PR65C-11BA 150 PSI PR65C SERIES PRESSURE REGULATOR, NNB

FESTO 145 PSI, SERIES ED08-14918 PNEUMATIC CYLINDER ADV-40-50-A

BOSCH RACINE 221887

SMC VXZ2240L SINGLE UNIT ZERO DIFFERENTIAL PILOT OPERATED DIAPHRAGM VALVE

ASHCROFT DURAGAUGE BRONZE TUBE 30-0VACUUM-IN/H?G. GAUGE 45-1379 103764

PARKER 11971-32-32 SAE CODE 61 FLANGE HEAD 90 ELBOW

MAC 6311A-512-PM-11?1DA 110/120 VOLTS 50/60 SOLENOID VALVE

MLOK CYLINDER RCN-138600CA

NUMATICS 24VDC, 4.0W, 150PSIG-AIR, PNEUMATIC VALVE I34BA400MP00061

SMC PNEUMATIC SERVICE KIT NIB CK95-80 105415

PARKER 150PSI 1034kPa PNEUMATIC SOLENOID VALVE B511ABB53C

NUMATICS 150PSIG PNEUMATIC SOLENOID VALVE NNB I35SA43BK000030 100509

NUMATICS PNEUMATIC PRESSURE REGULATING VALVE 031RD700O000000 NIB

MLOK CYLINDER RCN-138600-800-?05

NUMATICS 110/120V .06A 60HZ 150 PSIG SOLENOID VALVE, 031SA415O011Z

NUMATICS 120 V, 50-60HZ, .08A SOLENOID VALVE 1525A425K

NUMATICS PNEUMATIC AIR FILTER REGULATOR F22B-01AM 99883

NUMATICS MAX OPERATING PRESSURE 150 PSIG SOLENOID VALVE 135BB515MP00061

FESTO CPV18-VI U502 DISTRIBUTION MANIFOLD ASSEMBLY 185 886 T402

GRACO 250PSI 17.5BAR AIR LINE REGULATOR A01 A 214848

FESTO 63MM BORE 920MM STROKE PNEUMATIC CYLINDER, DKE-63-920-PPV-?A

ADVANCE AUTOMATION AAC SK-1176 PNEUMATIC CYLINDER SERIES I, NNB

TAIYO PNEUMATIC CYLINDER 40X30 NPB031A000-0

FESTO ALUMINUM CYLINDER 10543 DKE-100-60-PPV-?P

ELECTRON BEAM ENGINEERING QCC HD 504 WELDING CABLE, LOT OF TWO, NIB

FESTO 145 PSI 100MM BORE 160MM STROKE PNEUMATIC CYLINDER, DNC-100-160-PPV?, NNB

FESTO 32mm BORE 150mm STROKE PNEUMATIC CYLINDER DNC-32-150-PPV-?A NNB

FESTO 63MM BORE 125MM STROKE PNEUMATIC CYLINDER, DNU-63-125PPV-A?, NNB

NUMATICS 120V, 0.11A, 150 PSIG SOLENOID VALVE I52SA400K046T

MAC VAC/25-150PSI, 24VDC, 2.5W, PNEUMATIC SOLENOID VALVE 6523B-000-PM-59?2DA

BIMBA BRACKET CYLINDER D-167

PARKER 035341300B FILTER, NIB

SMC 1.0MPA PNEUMATIC CYLINDER DLMBN20-25C-G59?LS

PARKER 5000PSI DIRECTIONAL CONTROL VALVE 44036-2026

PARKER 250PSI ROTARY PNEUMATIC ACTUATOR PTR252-0983F-AX?22-C21

SMC 0.05-0.85MPA AIR REGULATOR AR4000-04BG

KYOHO MACHINE HCI-XD CYLINDER 40MM BORE 435MM STROKE 40X435-FA 74H40956

STAFFA FIXED DISPLACEMENT HYDRAULIC MOTOR HM/HDB2005/11

FESTO CPV14-VI TD02 DISTRIBUTION MANIFOLD ASSEM W/ SILENCER AND ELBOW FITTINGS

MAC 110/120VOLTS 150PSI SOLENOID VALVE 6311D-211-PM-11?1DA

FESTO 145 PSI 100MM BORE 30MM STROKE PNEUMATIC CYLINDER, ADVU-100-30-A-P?-A, NNB

YUKEN HYDRAULIC CYLINDER CJT 70 FA32B 20N-DND EK 11A

BELLOWS 110/120V 50/60HZ PNEUMATIC SOLENOID PILOT VALVE, K175-9035

FESTO 145 PSI 50MM BORE 90MM STROKE PNEUMATIC CYLINDER, DNG-50-90-PPV-A?, NNB

FESTO CPV14-VI T402 DISTRIBUTION MANIFOLD ASSEM W/ SILENCER AND ELBOW FITTINGS

FESTO 145 PSI 50MM BORE 153MM STROKE PNEUMATIC CYLINDER, DNGU-50-153-PPV?-A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B25N-?AND-EK 20A

MAC 110/120V 50/60HZ 150 PSI SOLENOID VALVE, 58D-43-116AA

CKD PNEUMATIC CYLINDER SSD-KL-50-80

PARKER HHB4087501 ALR 35-150 PSIG CONTROL VALVE, NNB

NUMATICS PNEUMATIC FILTER MODEL F30B-04C NIB

FESTO FLAT CYLINDER DZH-50-300-PPV-?A

BIMBA AIR CYLINDER BFT-093-D

PARKER 11771-32-32 CRIMP FITTING SAE CODE 61 FLANGE HEAD -45 ELBOW

KYOHO MACHINE HCI-XD CYLINDER 50MM BORE 115MM STROKE 50X115-CB 66H50888

PARKER 2.00 " BORE 8.000" STROKE HYDRAULIC CYLINDER JMAU14A

LENZ * LENZ NUT FITTING * UNKNOWN

NUMATICS 150PSIG, 110-120V, 50/60Hz, .15A, SOLENOID VALVE 081SS400K000030

FAIRCHILD TD C17800-406 PNEUMATIC TRANSDUCER, NNB

NUMATICS L23PM452O000000 PILOT VALVE, NNB

MAC PR92C-KECA 120 PSI PRESSURE REGULATOR, NIB

SMC PNEUMATIC CYLINDER 25MM BORE 35MM STROKE CQSB25-35D

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I24BA415MP