描述
FCS的關(guān)鍵要點(diǎn)有以下三點(diǎn)。
(1)FCS系統(tǒng)的核心是總線協(xié)議,即總線標(biāo)準(zhǔn)。
一種類(lèi)型的總線,只要其總線協(xié)議一經(jīng)確定,相關(guān)的關(guān)鍵技術(shù)與有關(guān)的設(shè)備也就被確定,就其總線協(xié)議的基本原理而言,各類(lèi)總線都是一樣的,都以解決雙向串行數(shù)字化通信傳輸為基本依據(jù)。但是由于各種原因,各類(lèi)總線的總線協(xié)議存在很大的差異。
為了使現(xiàn)場(chǎng)總線的滿(mǎn)足可互操作性要求,使其成為真正的開(kāi)放系統(tǒng),原IEC國(guó)際標(biāo)準(zhǔn),現(xiàn)場(chǎng)總線通信協(xié)議模擬的用戶(hù)層中,就明確規(guī)定用戶(hù)層具有裝置描述功能。為了實(shí)現(xiàn)互操作,每個(gè)現(xiàn)場(chǎng)總線裝置都用裝置描述DD來(lái)描述。DD能夠認(rèn)為是裝置的一個(gè)驅(qū)動(dòng)器,它包括所有必要的參數(shù)描述和主站所需要的操作步驟。由于DD包括描述裝置通信所需要的所有信息,并且與主站無(wú)關(guān),所以可以使現(xiàn)場(chǎng)裝置實(shí)現(xiàn)真正的互操作性。
實(shí)際情況是否如上述一致,回答是否定的。目前通過(guò)的現(xiàn)場(chǎng)總線國(guó)際標(biāo)準(zhǔn)含8種類(lèi)型,而原IEC國(guó)際標(biāo)準(zhǔn)只是8種類(lèi)型之一,與其它7種類(lèi)型總線的地位是平等的。其它7種類(lèi)型總線,不論其市場(chǎng)占有率有多少,每個(gè)總線協(xié)議都有一套軟件、硬件的支撐。他們能夠形成系統(tǒng),形成產(chǎn)品。而原IEC現(xiàn)場(chǎng)總線國(guó)際標(biāo)準(zhǔn),是一個(gè)既無(wú)軟件支撐也無(wú)硬件支撐的空架子。要實(shí)現(xiàn)這些總線的相互兼容和互操作,就目前狀態(tài)而言,幾乎是不可能的。
通過(guò)上述,我們是否可以得出這樣一種映象:開(kāi)放的現(xiàn)場(chǎng)總線控制系統(tǒng)的互操作性,就一個(gè)特定類(lèi)型的現(xiàn)場(chǎng)總線而言,只要遵循該類(lèi)型現(xiàn)場(chǎng)總線的總線協(xié)議,對(duì)其產(chǎn)品是開(kāi)放的,并具有互操作性,換句話說(shuō),不論什么廠家的產(chǎn)品,也不一定是該現(xiàn)場(chǎng)總線公司的產(chǎn)品,只要遵循該總線的總線協(xié)議,產(chǎn)品之間是開(kāi)放的,并具有互操作性,就可以組成總線網(wǎng)絡(luò)。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)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(jì)算機(jī)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(dòng)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(mén)子、摩托羅拉、GE發(fā)那科、安川、博世力士樂(lè),ACSO,力士樂(lè)等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
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G71854 NSK XY-HRS120-RH2SN?F Linear Stage w/Ballscrew
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G74627 Labsystems Flouroscan II Fluorescent Type 373
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G71680 Valhalla Scientific D6100 Spectral Pwr.Analyzer
G54942 Alcatel IPUP A100L Dry Vacuum Pump
G75678 Argonaut Tech.Quest 210 SLN Control&Quest 210
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G54937 Alcatel IPUP A100L Dry Vacuum Pump
C72909 Isel Robotik IPA-58-VKS3-1 5-8″Wafer Prealigner
AC44258 Prometrix Spectromap Film Wafer System SM200/e
C69221 Wentworth FIX-R-1-E Probe Card Repair Station
A34721 Thermotron Environmental Chamber,460/3/60
L75904 Karl Storz Equimat&Endomat System w/stand
C67797 R&K Rucker Kolls 300 Probe Card Building Station
A74366 Sartorius Sartocheck 3 Filter Integrity Tester
A74400 V&P Scientific VP 707 Magnetic Levitation Stirr
C54282 Hot Cold Temp Vacuum Wafer Chuck 11″Stage
C67233 Adept Robot Module 90400-04318/XY-P177S180-1
C56452 Tektronix TLA715 Logic Analyzer(Calibrated 2010
G71828 DeHaart MPC 24/29 Screen Printer
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A73306 Mar Research Mar345 Image Plate Detector
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C74536 Markem 590 SGT Pad Printer&Touch Panel Display
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C51252 Tektronix TLA715 Logic Analyzer(Calibrated 2010
C53849 Precision Measurement Microscope Sys w/X-Y Stage
A73329 Oxford Cryosystems Cooler Evap Probe,Pump Unit
CC44406 MRL 14TC-45 Conveyer Furnace/Reflow Oven
L75274 Cleansorb C5095DCC Dry Bed Absorber Cabinet
K67775 K&S Kulicke&Soffa 6490 Semi-Auto DieBonder
K72692 Quester Tech UFT10-02 Liquid Source Gas Cabinet
L70515 Varian DS 102 Dual Stage Rotary Vane Vacuum Pump
C72407 Flexus 2 Thin Film Stress Measurement System
C72662 Powervar GPI 3-Phase Power Conditioner 125kVA
A75741 Lab Products 59015HD Vet/Animal Caging System
C75836 Leitz Diavert Trinocular Inverted Microscope
C69606 Intevac NCT 200L Assy Sputtering Source Gun
C70441 Intevac Sputtering Source NCT Intervace Mark V
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AH43124 UTE SCS i 124 Substrate Vertical Lap Cleaner
A60926 ALPHASEM AG DB608-PRL Die Bonder w/Selectron
AC44359 Prometrix Resistivity Prober 6″VR-30A System
C71872 CTI-Cryogenics Cryo-Torr 100 Cryopump Cryo Pump
K68523 Kern CPM1 Stereocomparato?r Mono/Stereo
K75665 Nikon Optiphot-2 Trinocular Lab Microscope
R75873 UNISEM Model PPD1500A-A02-AM?T Chiller
L75702 GE Fractionation Kit*NIB*11-0035-99
AT51403 Hughes Model 2500 Automatic Die Bonder
A64698 Advanced Energy PEP-2500 Plasma RF Power Supply
G74798 Alphasem AG DB 608-PRL Die Bonder w/Selectron
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A72761 AMC Automation&Modular Component Modu-Con MX2
CT74225 Kevex 7078 Wafer Analysis,X-Ray Source Control
G61761 Applied Biosystems 373 DNA Sequence Stretch
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A75223 Power-One 3G37-36 Power Distrubution Unit 40 kVA
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C70560 Royce MBS200 Wire Bond Pull Tester MBS 200
A58949 ESEC SA Wafer Mounter 650.010/6
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A72210 Lot of Lithonia Lighting Reflectors,HID Housing
A74404 Wave Biotech O2MIX Controller,O2MIX20
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
L74808 Welch Allyn Video Path Colposcope 89021A
G63902 Forma Scientific 8325 Bio Freezer
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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
K72695 Innovate 9000 Semiconductor Test Head 220V
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
L75273 Asymtek MM-FSLU-STD Upstream Wafer Loader
L75438 Varian DS-102 Dual Stage Rotary Vane Vacuum Pump
C67115 HP Agilent 2090-0357 Vacuum Fluorescent Display
C67234 Adept Robot Module 90403-41063R XY-HRS063CS110A?D