描述
PLC在進行邏輯運算之前，必須對外部信號進行采樣[8]，若要實現(xiàn)指令的功能，首先要設(shè)置外部I/O在梯形圖中的地址，系統(tǒng)才能夠?qū)τ脩舫绦蛑兴褂玫腎/O地址與單片機的引腳地址相匹配。本設(shè)計在I/O設(shè)置對話框底層設(shè)計了如表1所示的數(shù)據(jù)處理函數(shù)。
3.2USB通信
PDIUSBD12的固件設(shè)計成完全的中斷驅(qū)動，當CPU處理前臺任務時，USB的傳輸可在后臺進行；后臺中斷服務程序和前臺主程序循環(huán)之間的數(shù)據(jù)交換可以通過事件標志和數(shù)據(jù)緩沖區(qū)來實現(xiàn)。當PDIUSBD12從USB收到一個數(shù)據(jù)包，即對CPU產(chǎn)生一個中斷請求，CPU立刻響應中斷。在中斷服務程序中，固件將數(shù)據(jù)包從PDIUSBD12內(nèi)部緩沖區(qū)移到循環(huán)數(shù)據(jù)緩沖區(qū)，并將PDIUSBD12的內(nèi)部緩沖區(qū)清零，以便接收新的數(shù)據(jù)包，使CPU可以繼續(xù)執(zhí)行當前的前臺任務直到完成。本文利用PDIUSBD12的端點1進行命令的傳輸和應答，端點1每次接收計算機發(fā)送過來的8B指令，其指令格式如表2所示。例如，接收到十六進制碼5201000300070050，表示讀24C01器件從03字節(jié)開始的7個字節(jié)的數(shù)據(jù)。52H為R的ASCII碼，57H為W的ASCII碼。端點2用于數(shù)據(jù)的傳輸。
本文在了解PLC國內(nèi)外研究狀況以及其市場需求的基礎(chǔ)上，提出了研發(fā)開放式PLC的概念，完成了PLC集成開發(fā)系統(tǒng)的C51模塊實現(xiàn)方案的設(shè)計，將USB通信方式引入PLC領(lǐng)域，所設(shè)計的梯形圖編輯器提供了梯形圖編輯平臺，實現(xiàn)了PLC的基本邏輯指令，完成計算機與控制器的USB通信
歐美品牌停產(chǎn)的，常用的“PLC”備品備件
我司產(chǎn)品應用于以下領(lǐng)域：
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計算機控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。
7 ADEPT 310 and 840 Robots Robotics
Branson Laser Stand Laser Welder Chiller System Chilli
Kulicke&Soffa K&S SP2100 TAB Bonder K&S K&S Wafer
J-Mar JMAR Precision Systems CMM 52610-01-01-N
JMAR PRECISION SYSTEMS 52610-01-01 CMM
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5 Foton 8030A Video Auto Die Bonders Semiconductor
LDJ Magnetic Analyzer 9600 VSM LTC10
ORBO TECH 360-04-50001 Imaging System
Instron 1122 Electromechanic?al test System
ORBO TECH 360-04-50001 Imaging System
Zumbach USYS 2000 1000 Laser Micrometer
Intergraph FDSP11304 IMA Microscope system
Haumiller Spin Welder Spinwelder 200 CPM
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INSTRON 1122 Electromechanic?al Test System
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ONAN AC GENERATOR CUMMINS ENGINE 50/60 kw
TREK Washer Film Cleaner 4 Station Inline Cleaner
TREK Washer Film Cleaner 4 Station Inline Cleaner
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Calsem Group 30T Delta Moulding Press
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Wabash PC650-50 65 Ton Hydraulic Press 30×24’’
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JEOL JEM-100cx Electron Microscope TEM Scanning
Corning 09-06 1 SME Fiber Optical Cable 41,000 ft Optic
Hermes Regent GU 3275S OD Grinder Grinding
Despatch HP516 Style V-2 Recirculating Electrical Oven
HP 43855B X Ray system
Electrovert UltraClean II H2O PCB Wash Machine
Walker Scientific Magnetizer HV-10 Electromagnet
Komax Alpha 411 Automatic Crimping Machine Wire
Comparator 89/CMS Optical Comparator
2 Pillarhouse Quadron Solder Dip Tin Machines
HP 8657A Signal Generator 14 units Total
2 Elgar AC Power Source 1751 400SR
7 LAMBDA PHYSIK LASER TECHNIK POWER CONTROLS
2 Diesel Generators PU-710/G&MEP-006A
Adept Cobra 600 Robot Robotic Arm
Adept Technology Cobra 600 Robot Robotic Arm MV-10
Zumbach USYS 1000 Laser Head Micrometer
Zumbach KW-26XY IR Laser Head Micrometer
LORAIN WAA502B INVERTER DC-AC 5 KVA
Totoku TCD-WP-S Magnet wire stripper 8 units
Universal 4836PDH-DC200 Media Blast Machine
Brown&Sharpe Traverse Surface Grinder No1 S148826
DUNHAM-BUSH EM-52-UHF REFRIGERATION COMPRESSOR 6 UNITS
Simpson S3-14 r Step Down Transformer Converter
Adept Cobra 600 Robot Robotic Arm
Adept Technology Cobra 600 Robot Robotic Arm
Adept Cobra 600 Robot Robotic Arm
Adept Cobra 600 Robot Robotic Arm
PMR SYSTEMS ULTRASONIC CLEANER.
Adept Cobra 600 Robot Robotic Arm PA-4
2 CONAIR 18041202 MOLDING DEHUMIDIFYING DRYER 480V 3PH
Ya SIH HTE-807 Cooper Wire Preheater
Kalamazoo FA350A Automatic Cold Saw
Tantec D-71299 Spot Corona Generator Surface Treater
HP 43855A X Ray System
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