描述
PLC的容量包括I/O点数和用户存储容量两个方面。
(一)I/O点数的选择
PLC平均的I/O点的价格还比较高,因此应该合理选用PLC的I/O点的数量,在满足控制要求的前提下力争使用的I/O点最少,但必须留有一定的裕量。
通常I/O点数是根据被控对象的输入、输出信号的实际需要,再加上10%~15%的裕量来确定。
(二)存储容量的选择
用户程序所需的存储容量大小不仅与PLC系统的功能有关,而且还与功能实现的方法、程序编写水平有关。一个有经验的程序员和一个初学者,在完成同一复杂功能时,其程序量可能相差25%之多,所以对于初学者应该在存储容量估算时多留裕量。
PLC的I/O点数的多少,在很大程序上反映了PLC系统的功能要求,因此可在I/O点数确定的基础上,按下式估算存储容量后,再加20%~30%的裕量。
存储容量(字节)=开关量I/O点数×10+模拟量I/O通道数×100
另外,在存储容量选择的同时,注意对存储器的类型的选择。
欧美品牌停产的,常用的“PLC”备品备件
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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
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A72207 Lot of Quality Transformers Corp.10kVA,7.5kVA
A72210 Lot of Lithonia Lighting Reflectors,HID Housing
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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
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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
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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
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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