国产三线在线,亚洲久草在线视频,9久re热视频在线精品,久久久xxx

我們新研制出一種用于紙漿白度測定的智能白度儀，該儀表采用西門子公司生產的S7-224 CPU結合軟件功能進行數據處理，具有較好的可靠性、重復性、精確度和穩定性。為了使其能與其它智能設備之間實現通信，我們將通過現場總線技術把它連接到網絡中，使它成為造紙廠現場總線控制系統的一部分。

2.現場總線的選擇

  2.1現場總線技術的選擇

  現場總線集控制技術、計算機技術、通信技術于一體，是當今自動化領域技術發展的熱點之一。這項技術可將多個智能控制儀表連接成網絡系統，實現分布式計算機控制，提高檢測和控制精度，改善系統的動態響應速度，提高系統安全性，從而得到了廣泛的應用。

  近年來，幾種有影響的現場總線技術已在一些特定的應用領域里顯示出各自的優勢。在此，我們選定了現為德國和歐洲標準的PROFIBUS（Process Fieldbus）現場總線。一方面由于它是目前數據傳輸率快的一種現場總線，傳輸率高可達12Mbps，另一方面它能夠很好的與西門子的傳動設備相配合，并與西門子PLC（Programmable Logic Controller）結合緊密且組態簡便。

  2.2 PROFIBUS現場總線簡介

  參照ISO/OSI參考模型,PROFIBUS現場總線只包含物理層、數據鏈路層和應用層。由PROFIBUS-DP，PROFIBUS-FMS， PROFIBUS-PA組成PROFIBUS系列。

  PROFIBUS-DP：經過優化的高速、廉價的通信連接，專為自動控制系統和設備級分散I/O之間通信設計，使用PROFIBUS-DP模塊可取代價格昂貴的24V或0～20mA并行信號線。用于分布式控制系統的高速數據傳輸。

  PROFIBUS-FMS ：解決車間級通用性通信任務，提供大量的通信服務，完成中等傳輸速度的循環和非循環通信任務，用于紡織工業、樓宇自動化、電氣傳動、傳感器和執行器、可編程序控制器、低壓開關設備等一般自動化控制。

  PROFIBUS-PA專為過程自動化設計，標準的本質安全的傳輸技術，實現了IEC1158-2中規定的通信規程，用于對安全性要求高的場合及由總線供電的站點。

  本設計中采用的是PROFIBUS-DP標準，PROFIBUS-DP（或DP標準）是由歐洲標準EN50170定義的一種遠程I/O通信協議。DP表示分布式外圍設備，亦即遠程I/O。PROFIBUS-DP還用到了應用層接口（ALI），ALI將過程對象轉換為通信對象。

WESTINGHOUSE, NCG31000 U, , 600V, WESTINGHOUSE NCG31000 U 1000A 600V 3P 
WESTINGHOUSE, NCDC312F1 U, , 600V
WESTINGHOUSE, NC31200WK U, , 600V
WESTINGHOUSE, NB3T400 U, , 600V, WESTINGHOUSE NB3T400 U 400A 600V 3P 
WESTINGHOUSE, NB3500PF U, , 600V, WESTINGHOUSE NB3500PF U 500A 600V 3P 
WESTINGHOUSE, NB31200WK U, , 600V
WESTINGHOUSE, NB31200, , 600V, WESTINGHOUSE NB31200 1200A 600V 3P 
WESTINGHOUSE, NB21200 U, , 600V, WESTINGHOUSE NB21200 U 1200A 600V 2P 
WESTINGHOUSE, MCP0358CR N, , 600V, WESTINGHOUSE MCP0358CR N 7A 600V 3P 
Westinghouse, MCC Bucket, Sz 2 starter, f Switch, Transf, Hr Meter, 
WESTINGHOUSE, MC3800WK U, , 600V, WESTINGHOUSE MC3800WK U 800A 600V 3P 
WESTINGHOUSE, MC3800NW, , 600V, WESTINGHOUSE MC3800NW 800A 600V 3P 
WESTINGHOUSE, MC3800FM U, , 600V, WESTINGHOUSE MC3800FM U 800A 600V 3P 
WESTINGHOUSE, MAGNETIC STARTER, STYLE 179C921G30, SIZE 4, 135 AMPS
WESTINGHOUSE, MAGNETIC STARTER, 764A890G01, SIZE 4, 135 AMPS
WESTINGHOUSE, MA3800NW U, , 600V, WESTINGHOUSE MA3800NW U 800A 600V 3P 
WESTINGHOUSE, MA3800F U, , 600V, WESTINGHOUSE MA3800F U 800A 600V 3P 
WESTINGHOUSE, LIFE-LINE TBOP 60 HP 1175 RPM 230/460 ELECTRIC MOTOR
WESTINGHOUSE, LC3600WK U, , 600V, WESTINGHOUSE LC3600WK U 600A 600V 3P 
WESTINGHOUSE, LC2600 U, , 600V, WESTINGHOUSE LC2600 U 600A 600V 2P 
WESTINGHOUSE, LBB3400W U, , 600V, WESTINGHOUSE LBB3400W U 400A 600V 3P 
WESTINGHOUSE, LBB330W U, , 600V, WESTINGHOUSE LBB330W U 300A 600V 3P 
WESTINGHOUSE, LBB2200 U, , 600V, WESTINGHOUSE LBB2200 U 200A 600V 2P 
WESTINGHOUSE, LB3400NXZ U, , 600V
WESTINGHOUSE, LB3400F U, , 600V, WESTINGHOUSE LB3400F U 400A 600V 3P 
WESTINGHOUSE, LB3300 U, , 600V, WESTINGHOUSE LB3300 U 300A 600V 3P 
WESTINGHOUSE, LB2400 U, , 600V, WESTINGHOUSE LB2400 U 400A 600V 3P 
WESTINGHOUSE, LA3600NWS U, , 600V
WESTINGHOUSE, LA3250, , 600V, WESTINGHOUSE LA3250 250A 600V 3P 
WESTINGHOUSE, KD2350, , 600V, WESTINGHOUSE KD2350 350A 600V 2P 
WESTINGHOUSE, KB3175, , 600V, WESTINGHOUSE KB3175 175A 600V 3P 
WESTINGHOUSE, KB3150, , 600V, WESTINGHOUSE KB3150 150A 600V 3P 
WESTINGHOUSE, KB3125, , 600V, WESTINGHOUSE KB3125 125A 600V 3P 
WESTINGHOUSE, KB3100, , 600V, WESTINGHOUSE KB3100 100A 600V 3P 
WESTINGHOUSE, KB2150 U, , 600V, WESTINGHOUSE KB2150 U 150A 600V 2P 
WESTINGHOUSE, KA3150, , 600V, WESTINGHOUSE KA3150 150A 600V 3P 
WESTINGHOUSE, KA3125, , 600V, WESTINGHOUSE KA3125 125A 600V 3P 
WESTINGHOUSE, JB3225, , 600V, WESTINGHOUSE JB3225 225A 600V 3P 
WESTINGHOUSE, JB3125W U, , 600V, WESTINGHOUSE JB3125W U 125A 600V 3P 
WESTINGHOUSE, JA3200, , 600V, WESTINGHOUSE JA3200 200A 600V 3P 
WESTINGHOUSE, JA3150, , 600V, WESTINGHOUSE JA3150 150A 600V 3P 
WESTINGHOUSE, JA3090, , 600V, WESTINGHOUSE JA3090 90A 600V 3P 
Westinghouse, IQ1000, 1A49102H03, style#9966D32, guaranteed
Westinghouse, IQ1000, #7D78558, w/Operated Network Interface, guaranteed
Westinghouse, IQ Data Plus, Great condition and guaranteed to work
WESTINGHOUSE, HMA3800F U, , 600V, WESTINGHOUSE HMA3800F U 800A 600V 3P 
WESTINGHOUSE, HM2P4XWS10 U, , 600V
WESTINGHOUSE, HLCGA3150F U, , 600V
WESTINGHOUSE, HKB3175T U, , 600V, WESTINGHOUSE HKB3175T U 175A 600V 3P 
WESTINGHOUSE, HKB3150T U, , 600V, WESTINGHOUSE HKB3150T U 150A 600V 3P 
WESTINGHOUSE, HKB2200T U, , 600V, WESTINGHOUSE HKB2200T U 200A 600V 2P 
Westinghouse, Fuse Assembly, 450 Amp, 24R
WESTINGHOUSE, DIRECT CURRENT, MOTOR, HP 40, VOLT 480
WESTINGHOUSE, DA3400XZ U, , 600V, WESTINGHOUSE DA3400XZ U 400A 600V 3P 
WESTINGHOUSE, DA3250XZ U, , 600V, WESTINGHOUSE DA3250XZ U 250A 600V 3P 
WESTINGHOUSE, CIRCUIT BREAKER, JA3125SW, HIGH INTERRUPTING RATING
Westinghouse, A201K4CX, Non Reversing Contactor
Westinghouse, 626B187G13, Contact Kit
Westinghouse, 1625563 Contact kit
WESTINGHOUSE ZTAPN-361HJ  ZTAPN361HJ
WESTINGHOUSE ZTAP-361H-R  ZTAP361HR
WESTINGHOUSE Z20B  Z20B
Westinghouse XUK364 200 Amp Double Throw Safety Switch Manual Transfer C-H 600V
WESTINGHOUSE WYE DELTA STARTER
WESTiNGHOUSE WSE Si-2 W/ ENCL Sensor interface Module PROXiMiTY SYS ** MANUAL
WESTiNGHOUSE WSE 92410020200 NEXSENTRY STAR MiRO 16/8 iNDiVUAL CONTROLLER ***
WESTINGHOUSE WORLD SERIES 600HP INDUCTION MOTOR SN:4288AA-01 1778:RPM 
WESTINGHOUSE WOODWARD 5462-085 C FINAL DRIVER BOARD
WESTINGHOUSE WLI LOAD INTERRUPTER SWITCHGEAR 1200A 1200 A AMP 13.8KV IQ ANALYZER
WESTINGHOUSE WL36081  WL36081
WESTINGHOUSE WL-36074  WL36074
WESTINGHOUSE WL-36066  WL36066
WESTINGHOUSE WL-36064  WL36064
WESTINGHOUSE WL36049  WL36049
WESTINGHOUSE WL-36017  WL36017
WESTINGHOUSE WL36014  WL36014
Westinghouse WL34854A Vacuum Interrupter Circuit Breaker
Westinghouse WL-34101B
Westinghouse with structure Vacuum Circuit Breaker 15 kV Type 150 VCP-W 1000,
Westinghouse WHUN365 400 Amp nonfusible Stainless Steel Safety Switch Disconnect
WESTINGHOUSE WHUN363  WHUN363
WESTINGHOUSE WHUN362  WHUN362
WESTINGHOUSE WHUN323 100A NEMA 4X 3 POLE SAFETY SWITCH
WESTINGHOUSE WHUN31  WHUN31
WESTINGHOUSE WHFN323 100A 3P HEAVY DUTY SAFETY SWITCH
Westinghouse WH Size Sz 4 A201K4CX Contactor 135A 480V
Westinghouse WH Size Sz 4 A201K4CAG Motor Starter 110V
Westinghouse WH Size Sz 4 A200M4CW Motor Starter 240V