描述
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,但其最大数受CPU所能管理的基本配置的能力,即受最大的底板或机架槽数限制。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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MKS 146B 4 Channel MFC Gas Mass Flow Controller 146 B
Comet Mini Vacuum Capacitor 15kV 210pF MC1C-210 E/15
Advanced Energy AE RFG 2000-2V RF Generator 3155053-007
Leybold Ionivac High Vacuum Ion Gauge Controller IM110D
Leybold Turbovac TMP 50 High Vacuum Turbo Pump ISO 100
MKS 2 Torr Baratron Pressure Transducer 122BA-00010EB
MDC High Vacuum Gate Valve NW KF QF 50 KGV-2000V-P-03
Nor-Cal High Vacuum Isolation Valve conflat 221-921-900
Lot of 6 Fujikin Gas Flow Control Valves 2 manifolds
Advanced Energy PDX900-2V RF Generator AMAT 3156024-110
Spellman High Voltage Power Supply Pre Load RSB40X3995
Kaiser KSI High Voltage Power Supply+1 kV 1A S1-1-1000
Varian High Voltage Surge Suppressor E11029161 Edal HVR
AE Advanced Energy RFG 1251 RF Generator 3155107-001 B
AE Advanced Energy RFX 2500 RF Generator 3155011-000
Advanced Energy Apex 3013 RF Plasma Generator 3kW AE
RFPP RF5S RF Generator RF 5S Plasma Advanced Energy AE
Glassman+5 kV 20mA High Voltage Power Supply HV
Trazar Paralax Igniter RF Generator 27MHz 1200W IG270
MKS 146C Vacuum Gauge Measurement Control System 146 C
Varian Turbo V 300 ICE MacroTorr High Vacuum Turbo Pump
AMAT 8330 Micro-Match RF Matching Network 0010-00799
NEW RFPP Advanced Energy Harmonic Filter 1 kW 350kHz AE
Advanced Energy AE RFG/AZX Control Panel 3155050-000A
Eaton Ion Implanter Surge Protection Bd 1504260 HV kV
Applied Materials 8100 D System DC Power Supplies AMAT
AMAT Applied Materials MXP+RF Match Network Tuner
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Advanced Energy AZX63 RF Match 3155031-014 AMAT
AE Advanced Energy APEX 3013 RF Generator AMAT Working
Applied Materials AMAT CVD RF Match 0010-9750W Tested
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Glassman KL High Voltage Power Supply-30 kV 100mA
RFPP Advanced Energy RF 10S Power Amplifier MRF150 NEW
Hitek Hivolt High Voltage Power Supply-30 kV 1kW HV
LAM Research 13.56MHz RF Match Network Kiyo Poly Etch
NEW Astech ATL-100RA LF RF Match Network 500W RFPP AE
Applied Materials RF Match Phase 4 AMAT P/N 0010-09416
BOC Edwards EPX 180L Dry Molecular Vacuum Pump Tested
Advanced Energy AE HTCM RF Match AZX Control Module
Leybold Turbovac 450 Turbo Pump NT450 w/Cable,Rebuilt
AE Advanced Energy AZX90 RF Match 3155031-011B AMAT
Varian Turbo V 301 Navigator Control Unit 9698973
Systron Donner M107 Precision DC Voltage Source Tested
Dressler Advanced Energy ProSys Mega Pulse RF Generator
Applied Materials Ion Implanter Arc Control DSP
Advanced Energy AE Multifunction RF Match 3156035-100
AE Advanced Energy LF-10A 1000W Generator 3150010-001E
ADVANCED ENERGY AE-4855015 USPP AE4855015
AE Advanced Energy RFDS 2000-2V RF Gen.3155038-013 2kW
AE Advanced Energy MDX-L6 Magnetron 3152343-000A
AE Advanced Energy RF10M RF20M User Manual 5708513 NEW
AE Advanced Energy MDX-5K Power Supply 2011-035-Y 5kW
AE Advanced Energy RFDS 2000-2V RF Gen.3155038-013C
AE RFPP Advanced Energy LF-5 500W Generator 3150012-009
AE Advanced Energy 3152334-000B AMAT Applied Materials
AE Advanced Energy PDX 1250 RF Generator 3156024-131A
AE Advanced Energy MDX-20K Master 3152223-003-Y 20kW
AE Advanced Energy Navigator 1013 RF Match 3155126-017A
AE ADVANCED ENERGY CABLE
AE Advanced Energy RFPP LF-5 Generator 7520572050 500W
AE Advanced Energy RF Match Network 3155031-014D
AE Advanced Energy PDX 1250 RF Generator 3156024-131A
AE ADVANCED ENERGY PDW2200 RF GENERATOR
AE Advanced Energy RFPP RF Match 7621993020 working
AE Advanced Energy 2500W RF Match 3150275-007G working