描述
随着PLC技术的发展,PLC产品的种类也越来越多。不同型号的PLC,其结构形式、性能、容量、指令系统、编程方式、价格等也各有不同,适用的场合也各有侧重。因此,合理选用PLC,对于提高PLC控制系统的技术经济指标有着重要意义。
PLC的选择主要应从PLC的机型、容量、I/O模块、电源模块、特殊功能模块、通信联网能力等方面加以综合考虑。
PLC机型的选择
PLC机型选择的基本原则是在满足功能要求及保证可靠、维护方便的前提下,力争最佳的性能价格比。选择时主要考虑以下几点:
(一)合理的结构型式
PLC主要有整体式和模块式两种结构型式。
整体式PLC的每一个I/O点的平均价格比模块式的便宜,且体积相对较小,一般用于系统工艺过程较为固定的小型控制系统中;而模块式PLC的功能扩展灵活方便,在I/O点数、输入点数与输出点数的比例、I/O模块的种类等方面选择余地大,且维修方便,一般于较复杂的控制系统。
(二)安装方式的选择
PLC系统的安装方式分为集中式、远程I/O式以及多台PLC联网的分布式。
集中式不需要设置驱动远程I/O硬件,系统反应快、成本低;远程I/O式适用于大型系统,系统的装置分布范围很广,远程I/O可以分散安装在现场装置附近,连线短,但需要增设驱动器和远程I/O电源;多台PLC联网的分布式适用于多台设备分别独立控制,又要相互联系的场合,可以选用小型PLC,但必须要附加通讯模块。
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
本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。
N69740 B.Braun Biotech 884201/9 Bioreactor w/Dispenser
N69743 The Baker Company SG603-TX SterilchemGARD III
C56823 Dage Microtester 22 10kg Shear Test Load Cell
C70560 Royce MBS200 Wire Bond Pull Tester MBS 200
K70517 HP Agilent E7101-67936 Prober Tester PTI*NIB*
A58949 ESEC SA Wafer Mounter 650.010/6
A58556 Beckman Multimek 96 Automated 96-CH Pipettor
A38873 Tektronix RTD720A Real Time Digitizer w/Display
N59240 Nicolet 5DXC FT-IR Spectrometer
A72207 Lot of Quality Transformers Corp.10kVA,7.5kVA
A72210 Lot of Lithonia Lighting Reflectors,HID Housing
C53689 Tenney 5 Environmental Chamber(m/n T5-2-100350)
C52722 MCT 4600 Chip Carrier IC Handler for 84PLCC
C52721 MCT 4610 Chip Carrier IC Handler for 28PLCC
C52701 MCT 4600 Chip Carrier IC Handler for 52PLCC
N69895 IPM Balanced Power II BP1125-2020
G63881 Forma Scientific 8525 Bio Freezer
G63896 Forma Scientific 8425 Bio Freezer
G63902 Forma Scientific 8325 Bio Freezer
C52694 MCT 3608E IC Handler for 300mil 20pin DIP 3608E3
C52696 MCT 3616E IC Handler(m/n 3616E48P)
C70012 Dage Microtester 22 500gm Shear Test Load Cell
C68808 Davidson Optronics D657-100A Autocollimator
C52790 Dage Microtester BT22 5kg Pull Test Load Cell
C52792 Dage Microtester BT22 200g Pull Test Load Cell
C52791 Dage Microtester BT22 1.5kg Pull Test Load Cell
C67867 Dage BT22-LC02 50gm Pull Test Load Cell for BT22
K72114 Titertek Plus ICN Flow M96V Washer,S20 Stacker
K70248 Equipe Technologies ATM-3108 Wafer Loader Robot
K67967 Inter-Lakes 4436 Press/Splitter Vibration Table
G66211 Labcyte EDR-384SII Multi Dispenser,Automated
Y72289 Elga Purelab Ultra GE MK2 DNA Water Purification
Y72303 Millipore Labscale TFF System Pump Stirrer 29751
K66949 CEE 2100 Cassette to Cassette Hotplate System
AP42588 Parker HPD67 Servo Amplifier CA-112405-R
G40949 Eastey Ent.Shrink Packaging Tunnel ET 1610-48
N67899 Tektronix TCA-1MEG High Buffer Amplifier
G70599 Six Tektronix P6135A 150MHz 10X Probes NIB
C72847 Haskris R050EW WaterCooled Recirculating Chiller
C72848 Haskris R050EA Air-Cooled Recirculating Chiller
C64550 Blue M OV-560A-2 Lab Oven(120V,1Ph,to 400°F)
C71024 Sigma Systems SuprCyclr Environmental Chamber
G72011 Varian ProStar 420 Autosampler
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A69318 Thermo Forma-86C ULT Freezer,Model 8558
G53115 Poly Mold Hydraulic Press&Racine Supervane Pmp
A68353(2)Lindberg Tube Furnaces Type 54357,54357A
A58114 Disco DWT-13R Water Temperature Control Unit
A60985 Kato Laboratory Temperature Oven-70°C~180°C
A69994 Nalorac Z-Spec Pulse Tune Driver,Level 2B
A59232 Sanyo Seiki SR7150-0002C-Z Robotic Arm
A64354 Genetix QPIX Colony Picking System
A64357 Mettler Toledo Myriad Allex Automated Chemistry
C72661 Nunome Electric 90kVA 200VAC 260A Transformer
Y72290 Eppendorf 5417C Bench Top Centrifuge 14K RPM
C70101 Blue M OV-490A-3 Mechanical Convection Oven
C51211 Tektronix TLA 7N4 136Ch LA Module 2GHz/200MHz/1M
C51209 Tektronix TLA7M4 136Ch LA Module 2GHz/100MHz/512
G72042 THK GL15S16+1250L Positioning Linear Stage
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A58604(2)Varian 3700 Gas Chromatograph,Autosampler
N72631 Welch 2025 Self Cleaning Dry Vacuum System
K72111 BioCad Perfusion Chromatography LAB Workstation
N72630 Bio/Data PAP-4 Platelet Aggregation Profiler
A72284 Nanometrics 7200 Film Thickness System,Olympus
C72666 MECS Asyst OF250 Wafer Prealigner&Controller
C53058 Eutectic Heated Work Holder 6″Wafer Hot Chuck
C54375 Hot Chuck Wafer Stage 8.25″w/Digital Controller
A52645 NuAire NU-3700 Dual CO2 Water Jacketed Incubator
C68411 Bradley GPS Positioning Navigation Test Station
AT51338 Daikin Industries UBR3E6 Brine Chilling Unit