1、引言 
       在一個橋接的局域網里，為了增強可靠性，必然要建立一個冗余的路徑，網段會用冗余的網橋連接。但是，在一個透明橋橋接的網絡里，存在冗余的路徑就能建立一個橋回路，橋回路對于一個局域網是致命的。它會帶來如下問題： 
       A.廣播風暴 
       B.同一幀的多份拷貝 
       C.不穩(wěn)定的MAC地址表 
       因此，在交換網絡中必須有一個機制來阻止回路。 
      2、生成樹協(xié)議 
       生成樹協(xié)議就是IT界中常用的機制.生成樹協(xié)議是一種橋嵌套協(xié)議，在IEEE 802.1d規(guī)范里定義，可以用來消除橋回路。它的工作原理是這樣的：生成樹協(xié)議定義了一個數(shù)據(jù)包，叫做橋協(xié)議數(shù)據(jù)單元BPDU（Bridge Protocol Data Unit）。網橋用BPDU來相互通信，并用BPDU的相關機能來動態(tài)選擇根橋和備份橋。但是因為從中心橋到任何網段只有一個路徑存在，所以橋回路被消除。 
       在一個生成樹環(huán)境里，橋不會立即開始轉發(fā)功能，它們必須首先選擇一個橋為根橋，然后建立一個路徑。在一個網絡里邊擁有zui低橋ID的將變成一個根橋，全部的生成樹網絡里面只有一個根橋。根橋的主要職責是定期發(fā)送配置信息，然后這種配置信息將會被所有的橋發(fā)送。這在生成樹網絡里面是一種機制，一旦網絡結構發(fā)生變化，網絡狀態(tài)將會重新配置。 
       當選定根橋之后，在轉發(fā)數(shù)據(jù)包之前，它們必須決定每一個網段的橋，運用生成樹的這種算法，根橋每隔2秒鐘從它所有的端口發(fā)送BPDU包，BPDU包被所有的橋從它們的根端口復制過來，根端口是接根橋的那些橋端口。BPDU包括的信息叫做端口的COST，網絡管理員分配端口的COST到所有的橋端口，當根橋發(fā)送BPDU的時候，根橋設置它的端口值為零。然后沿著這條路徑，下一個橋增加它的配置端口COST為一個值，這個值是它接收和轉發(fā)數(shù)據(jù)包到下一個網段的值。這樣每一個橋都增加它的端口的COST值為它所接收的BPDU的包的COST值，所有的橋都檢測它們的端口的COST值，擁有zui低端口的COST值的橋就變?yōu)榱说臉颉碛斜容^口COST值的橋置它的端口進入阻塞狀態(tài)，變?yōu)榱藗浞輼颉Ｔ谧枞麪顟B(tài)，一個橋停止了轉發(fā)，但是它會繼續(xù)接收和處理BPDU數(shù)據(jù)包。 
       IEEE 802.1D規(guī)范包括了生成樹算法（Spanning Tree Algorithm，STA），這是一種確保轉發(fā)循環(huán)永遠不會發(fā)生的機制。 STA使用網橋協(xié)議數(shù)據(jù)單元（Bridge Protocol Data Units，BPDU），自動配置網橋上處于轉發(fā)或阻塞狀態(tài)的獨立端口。BPDU是網橋發(fā)送到一個已保存的多播MAC地址（對于以太網，這個地址是01-80-C2-00-00-00）的消息，所有透明網橋都會偵聽該地址。在阻塞狀態(tài)下，端口不會獲悉或轉發(fā)已接收到的幀。STA的zui終結果是一個無循環(huán)的橋接環(huán)境，不管局域網網段拓撲結構是否改變，這個環(huán)境總是一直存在。生成樹算法決定了網絡鏈路故障恢復時間,zui少不低于15秒。 
       生成樹的狀態(tài): 
       運行生成樹協(xié)議的交換機上的端口，總是處于下面五個狀態(tài)中的一個： 
       阻塞：所有端口以阻塞狀態(tài)啟動以防止回路，由生成樹確定哪個端口切換為轉發(fā)狀態(tài)，處于阻塞狀態(tài)的端口不轉發(fā)數(shù)據(jù)幀但可接受BPDU。 
       監(jiān)聽：不轉發(fā)數(shù)據(jù)幀，但檢測BPDU（臨時狀態(tài)）。 
       學習：不轉發(fā)數(shù)據(jù)幀，但學習MAC地址表（臨時狀態(tài)）。 
       轉發(fā)：可以傳送和接受數(shù)據(jù)數(shù)據(jù)幀。 
       禁用：通常由于端口故障或交換機配置錯誤引起. 
      3、Supreme-Ring協(xié)議 
       Supreme-Ring協(xié)議是在工業(yè)以太網使用的冗余機制。Supreme-Ring協(xié)議和生成樹協(xié)議有點相似，Supreme-Ring協(xié)議也定義了一種數(shù)據(jù)包，稱為HELLO包，又稱為WD包（Watch Dog Packets)。交換機之間用HELLO包通信，在主交換機上動態(tài)選擇主鏈路和備份鏈路。但是因為從中心橋到任何網段只有一個路徑存在，所以橋回路被消除。 
       在工業(yè)冗余環(huán)網網絡環(huán)境里,交換機不會立即開始轉發(fā)功能,主交換機(Local)由手動,選擇主鏈路和備份鏈路建立一個路徑,由Supreme-Ring協(xié)議自動。一個工業(yè)冗余環(huán)網網絡里面只能有一個主交換機(Local)。主交換機(Local)會定期發(fā)送配置信息，這種配置信息將會被所有的從交換機（Remote）發(fā)送。一旦網絡結構發(fā)生變化，網絡狀態(tài)將會重新配置。 
       當主交換機(Local)之后，在轉發(fā)數(shù)據(jù)包之前，所有端口都以阻塞方式啟動。運用Supreme-Ring算法，主交換機(Local)選擇zui低COST值的端口作為主鏈路，另一條COST值高的端口作為備份鏈路。備份鏈路不轉發(fā)數(shù)據(jù)，只接收和處理HELLO包，處于熱備（Hot Standby）狀態(tài)。從交換機（Remote）沒有主鏈路和備份鏈路的區(qū)別。Supreme-Ring協(xié)議是一種簡潔高效的冗余協(xié)議，能夠保證環(huán)網在鏈路故障時，在300ms之內恢復網絡通信。 
       Supreme-Ring的狀態(tài)： 
       運行Supreme-Ring協(xié)議的交換機上的端口，總是處于下面四個狀態(tài)中的一個： 
       阻塞：所有端口以阻塞狀態(tài)啟動以防止回路，處于阻塞狀態(tài)的端口不轉發(fā)數(shù)據(jù)幀但可接受HELLO包。 
       熱備：不轉發(fā)數(shù)據(jù)幀，但學習MAC地址表，在主鏈路故障時，在300ms之內，立刻進入轉發(fā)狀態(tài)。 
       轉發(fā)：可以傳送和接受數(shù)據(jù)數(shù)據(jù)幀。 
       禁用：通常由于端口故障或交換機配置錯誤引起。 
       4、結束語 
       工業(yè)網絡環(huán)境需要快速反應冗余機制，生成樹協(xié)議的15秒恢復時間，不能滿足工業(yè)環(huán)境要求。只有采用Supreme-Ring協(xié)議才是工業(yè)網絡環(huán)境的*冗余機制。

◆ 企業(yè)名稱：廈門興潤星貿易有限公司

◆ 企業(yè)性質： 有限責任公司

◆ 主營業(yè)務：DCS,PLC

◆ 經營模式： 貿易

◆ 貿易地區(qū)： 全國

◆ :陽

◆ 商務：

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◆ （備注“0028”收）

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34905  Allen-Bradley 1746-OW16 Output Module 5-265VAC 50/60Hz
35 BUTTON ALLEN BRADLEY REDI PANEL 120/240 VAC
35 BUTTON ALLEN BRADLEY REDI PANEL 120/240 VAC
3510-KP XYCOM
3510-KP XYCOM
35115 Old-Stock Opto 22 AD6 Output Module 0-5V Input
3512KPM XYCOM
3512KPM XYCOM
3512-T XYCOM 1 YR WARRANTY
3512-T XYCOM 1 YR WARRANTY
3515T XYCOM OPERATOR TERMINAL 1YR. WRTY
3515T XYCOM OPERATOR TERMINAL 1YR. WRTY
3515T XYCOM OPERATOR TERMINAL 1YR. WRTY
3515T XYCOM OPERATOR TERMINAL 1YR. WRTY
36232 -No Box Crouzet C40AC Output Module 12-120VAC / 3amp Output
36232 -No Box Crouzet C40AC Output Module 12-120VAC / 3amp Output
3710-ACM POWER MEASUREMENT 3710ACM
38449 -No Box Gordos SM-IAC5 Digital Module 90-140VAC Output 50mA 30VDC
38449 -No Box Gordos SM-IAC5 Digital Module 90-140VAC Output 50mA 30VDC
38489  In box Schneider AS-BDAU-202 Output Module 10V
38489  In box Schneider AS-BDAU-202 Output Module 10V
387-SNSPP387S
38-K21ILA-0P ALLEN BRADLEY
38-K21ILA-0P ALLEN BRADLEY
38-K21ILA-0P ALLEN BRADLEY
38-K21ILA-0P ALLEN BRADLEY
39304 Old-Stock OPTO 22 G4 OAC5 Output Module 3AMP 120VAC
39304 Old-Stock OPTO 22 G4 OAC5 Output Module 3AMP 120VAC
3M 0500-10959 NSPP 050010959
3M 0500-33893 NSFP 050033893
3M NSFP
3M 051144-20852-E?A NSPP EA
3M 10014 NSFP 10014
3M 10120 NSPP 10120
3M 10320 NSPP 10320
3M 2155 NSFP 2155
3M 2CW09 NSPP 2CW09
3M 30041 NSPP 30041
3M 30041 USPP 30041
3M 3414-7034 NSPP 34147034
3M 3431-3005 USPP 34313005
3M 34-7024-9208-2?-A USPP 34702492082A
3M 3M6300-B NSFP 3M6300B
3M 450-00-01 NSPP 4500001
3M 51916 NSPP 51916
3M 78806025025 NSFP 78806025025
3M 9602106202AR FNFP 9602106202AR
3M CC-2 NSPP CC2
3M H-110-10 NSFP H11010
3M INTRACOM-KEYPA?D-TALK-STANDBY USPP INTRACOMKEYPAD?TA
3M ITCSN200012BOX NSFP ITCSN200012BOX
3M L-165 USPP L165
3M M4-14RX NSFP M414RX
3M Microtouch Touchscreen 19.5cm14.6cm & Controller CX111 98-0003-2990-8
3M Microtouch Touchscreen 19.5cm14.6cm & Controller CX111 98-0003-2990-8
3M Microtouch Touchscreen 35.7cm29.5cm & Controller EX11-7760UC  Surplus
3M Microtouch Touchscreen 35.7cm29.5cm & Controller EX11-7760UC  Surplus
3M PG13.5 NSPP PG135
3M PG13.5 USPP PG135
3M SDR-BL NSFP SDRBL
3M Touch Systems KSP17EUT
3M W-3222-2 NSFP W32222
3M W-3267 NSFP W3267
3M W-3267 NSPP W3267
3M W-800-1 NSFP W8001
3M W-8006 NSPP W8006
3M2155NSPP2155
3pc Honeywell ISSC AC Output PLC Modules 621-2100
3pcs PL2303HX USB to TTL Serial pport Converter Module 5V  3.3V Output
3pcs PL2303HX USB to TTL Serial pport Converter Module 5V  3.3V Output
3-Phase Solid State Relay Module DC to 24-380V AC 100A Output TSR-100DA
3-Phase Solid State Relay Module DC to 24-380V AC 100A Output TSR-100DA
3-Phase Solid State Relay Module DC to 24-380V AC 100A Output TSR-100DA
3-Phase Solid State Relay Module DC to 24-380V AC 80A Output TSR-80DA
3-Phase Solid State Relay Module DC to 24-380V AC 80A Output TSR-80DA
3-Phase Solid State Relay Module DC to 24-380V AC 80A Output TSR-80DA
3-Phase Solid State Relay Module DC to 24-380V AC 80A Output TSR-80DA
3-Phase Solid State Relay Module DC to 24-380V AC 80A Output TSR-80DA
4  SCHNEIDER ELECTRIC ZBY2304 "STOP" LEGEND PLATE 22MM 
4  SCHNEIDER ELECTRIC ZBY2304 "STOP" LEGEND PLATE 22MM 
4  SCHNEIDER ELECTRIC ZBY2304 STOP LEGEND PLATE 22MM 
4- ALLEN BRADLEY DATALINER OPERATOR INTERFACE 2706-A41L
4- ALLEN BRADLEY DATALINER OPERATOR INTERFACE 2706-A41L
4 ALLEN BRADLEY OUTPUT MODULE 1746-OA16  
4 I/O OUTPUT RAIL MOUNT INTERFACE MODULES IO-ODC-RO-060 CONTINENTAL INDUSTRIES
4 OMRON PLC OUTPUT MODULES UNITS C200H-OD212 24VDC 16pt
4 Opto 22 G4 OAC5 Output 120V 3A 5V Logic I/O Module
4 Opto 22 G4 ODC5 Output 60VDC 3A 5V Logic I/O Module
4 PCS LOT LED DIMMER 12 VOLT ONE OUTPUT FOR LIGHTING BARS STRINGS FLEX MODULES
4 PCS LOT LED DIMMER 12 VOLT ONE OUTPUT FOR LIGHTING BARS STRINGS FLEX MODULES
4 PCS LOT LED DIMMER 12 VOLT ONE OUTPUT FOR LIGHTING BARS STRINGS FLEX MODULES
4 TEXAS INSTRUMENTS 24/48VDC OUTPUT MODULES 500-5013
4 YASKAWA DIGITAL OPERATOR JVOP-160 With G7 Drive Technical Manual
40.17.300 CPU I/O CONTROL BOARD INPUT OUTPUT MODULE
40513 -No Box Avg Automation EZ-T10C-F Operator Interface Flat Panel LCD 
40513 -No Box Avg Automation EZ-T10C-F Operator Interface Flat Panel LCD 
40513 -No Box Avg Automation EZ-T10C-F Operator Interface Flat Panel LCD 
4150 XYCOM
4150 XYCOM
4150 XYCOM
4150 XYCOM
4160-B XYCOM
4160-B XYCOM
4160-B XYCOM
4160-B XYCOM
41Segment led module  for indicating the temperature input and output values
4345  In Box Schneider 170 ADO 540 50 Output Module
44348NSFP44348
44C0T0 AUTOMATION INDUSTRIAL
44C0T0 AUTOMATION INDUSTRIAL
4810 XYCOM RAC-PAC TERMINAL
4810 XYCOM RAC-PAC TERMINAL
4810E XYCOM
4810E XYCOM
4810E XYCOM
4810ER XYCOM MONITOR REFURB
4810ER XYCOM MONITOR REFURB
4812 XYCOM
4812 XYCOM
4850 XYCOM
4850 XYCOM
4860 XYCOM
4860 XYCOM
4860 XYCOM
4860 XYCOM
4pc Potter  Brumfield Opto 22 AC Output Module OAC-15
4-Way output Buck-Boost DC Power Converter Module 3A
4-way relay module MCU 5V 24V dual-wizard through the PLC NPN PNP output
4-way relay module MCU 5V 24V dual-wizard through the PLC NPN PNP output
5 2-button Membrane Switch Control Panel w/ LED Light
5 2-button Membrane Switch Control Panel w/ LED Light
5 2-button Membrane Switch Control Panel w/ LED Light
5 Amps Voltage Regulator Module Output 1.5-32V LM338T
5 MODULE LED LIGHTING STRING 12 VOLT DC SAMSUNG LEDS HIGH OUTPUT WHITE LIGHT
5 PIECE ELECTRONIC DRUM KIT WITH SOUND MODULE USB  MIDI OUTPUT BRAND  LOOK
5 PIECE ELECTRONIC DRUM KIT WITH SOUND MODULE USB  MIDI OUTPUT BRAND  LOOK
5 x Light sensor module with Digital and analog output ideal Arduino with cable
50 x Light sensor module with Digital and analog output ideal Arduino with cable
500-5056 Texas Instruments Siemens TI 32 pt output module 5005056 N110
500-5056 Texas Instruments Siemens TI 32 pt output module 5005056 N170
500-5056 Texas Instruments Siemens TI 32 pt output module 5005056 N300
50x DC-DC Step-Down Converter Power Supply Module Input: 10-15V Output: 0.9-12V
51 Seg led module display  for indicating temperature input and output value
5455 THORNTON 200CR CONTROL PANEL 2 ANALOG & RELAY OUTPUTS
5455 THORNTON 200CR CONTROL PANEL 2 ANALOG & RELAY OUTPUTS
553VIC10100 MODICON
553VIC10100 MODICON
553VIC10100 MODICON
553VIC10100 MODICON
553VIC10101 MODICON
553VIC10101 MODICON
553VIC14430 MODICON MONITOR
553VIC14430 MODICON MONITOR
553VIC14430 MODICON MONITOR
553VIC14430 MODICON MONITOR
5906  Opto 22 PB4R Output Module Rack
5907 -No Box Opto 22 PB4R Output Module Rack
5pcs 16-Key Membrane Switch Keypad General-Use
5pcs 16-Key Membrane Switch Keypad General-Use
5pcs DC-DC Buck Converter Step Down Module LM2596 Power Supply Output 1.23V-30V
5pcs PL2303HX USB to TTL Serial pport Converter Module 5V  3.3V Output 
5pcs PL2303HX USB to TTL Serial pport Converter Module 5V  3.3V Output 
5pcs Solar Boost DC-DC 3V-5V Adjustable Power Supply Module Standard USB Output
5pcs Solar Boost DC-DC 3V-5V Adjustable Power Supply Module Standard USB Output
5x Sound Sensor Module for Sound Detecting 3-15 V DC DIY Analog quantity output
5xLM2596 DC-DC Step Down CC-CV Adjustable Power Supply Module Output DC 1.5V-35V
6  IDI industrial machinery indicator bulbs 28V 1W
6  IDI industrial machinery indicator bulbs 28V 1W
6  IDI industrial machinery indicator bulbs 28V 1W
6 Allen Bradley Interface Units 4 of CATALOG 1492-1FM40F 1-A1FM6S-3 1-A1FMB-3
6 Allen Bradley Interface Units 4 of CATALOG1492-1FM40F 1-A1FM6S-3 1-A1FMB-3
6 Allen Bradley Interface Units 4 of CATALOG1492-1FM40F 1-A1FM6S-3 1-A1FMB-3
6 OPTO 22 ODC5Q OUTPUT RELAY MODULES
6 Relay Output Module Board for your AVR PIC Project - 12V
60 DAYS WARRANTY! 128MB Flash/RAM ControlNet/EtherNet
60 DAYS WARRANTY! Color Terminal 10.4" PKG 11/22/2011
60 DAYS WARRANTY! Color Touch 10.4" 512 MB PKG 12/2011
60 DAYS WARRANTY! QTY AVAILABLE! SERIES F PKG 2011
60 DAYS WARRANTY! SERIES F REV G FRN 3.30
60 DAYS WARRANTY! VersaView CE Color Terminal 10.4"
610521-01 Allen Bradley Hardware Battery Tray Mount
610521-01 Allen Bradley Hardware Battery Tray Mount
6156-AABAAZBBB?Z ALLEN BRADLEY IND.WORKSTATIO?N 1YRWRTY
6156-AABAAZBBB?Z ALLEN BRADLEY IND.WORKSTATIO?N 1YRWRTY
6156-AADAAZBBZ?Z ALLEN BRADLEY
6156-AADAAZBBZ?Z ALLEN BRADLEY
6156-AADAAZBBZ?Z ALLEN BRADLEY
6156-AADAAZBBZ?Z ALLEN BRADLEY
6156-AAZAAZAZA?Z ALLEN BRADLEY
6156-AAZAAZAZA?Z ALLEN BRADLEY
6156-AAZAAZAZA?Z ALLEN BRADLEY
6156-AAZAAZAZA?Z ALLEN BRADLEY
6160-PCD2C ALLEN BRADLEY現(xiàn)貨    CPU *處理器     1756-L61    *
現(xiàn)貨    CPU *處理器     1756-L61S    *
現(xiàn)貨    CPU *處理器     1756-L62    *
現(xiàn)貨    CPU *處理器     1756-L62S    *
現(xiàn)貨    CPU *處理器     1756-L63    *
現(xiàn)貨    CPU *處理器     1756-L63S    *
現(xiàn)貨    CPU *處理器     1756-L64    *
現(xiàn)貨    CPU *處理器     1756-L65    *
現(xiàn)貨    CPU *處理器     1756-L72    *
現(xiàn)貨    CPU *處理器     1756-L73    *
現(xiàn)貨    CPU *處理器     1756-L74    *
現(xiàn)貨    CPU *處理器     1756-L75    *
現(xiàn)貨    CPU *處理器     1756-LSP    *
現(xiàn)貨    CPU *處理器     1756-M02AE    *
現(xiàn)貨    CPU *處理器     1756-M02AS    *
現(xiàn)貨    CPU *處理器     1756-M03SE    *
現(xiàn)貨    CPU *處理器     1756-M08SE    *
現(xiàn)貨    CPU *處理器     1756-M08SEG    *
現(xiàn)貨    CPU *處理器     1756-M16SE    *

6160-PCD2C ALLEN BRADLEY
6180-AEEBFFABC?CZ ALLEN BRADLEY
6180-AEEBFFABC?CZ ALLEN BRADLEY
6180-AEEBFFABC?CZ ALLEN BRADLEY
6180-AEEBFFABC?CZ ALLEN BRADLEY
6180-EIGFFAZEZ?Z ALLEN BRADLEY
6180-EIGFFAZEZ?Z ALLEN BRADLEY
6180-EIGFFAZEZ?Z ALLEN BRADLEY
6180-EIGFFAZEZ?Z ALLEN BRADLEY
6180-ERMEFLDTE?CZ ALLEN BRADLEY
6180-ERMEFLDTE?CZ ALLEN BRADLEY
6180-ERMEFLDTE?CZ ALLEN BRADLEY
6181P-10TS2KH ALLEN BRADLEY
6182-AIAZZC W/SIMPLETECH 32MB FLASH CARD - 1 YEAR WARAN
6182-AIAZZC W/SIMPLETECH 32MB FLASH CARD - 1 YEAR WARAN
6182INDUSTRIAL?COMPUTER ALLEN BRADLEY
6182INDUSTRIAL?COMPUTER ALLEN BRADLEY
6182INDUSTRIAL?COMPUTER ALLEN BRADLEY
6182INDUSTRIAL?COMPUTER ALLEN BRADLEY
6231BP10910 TAYLOR I/O MODULE COMPLETE 
6231BP10910 TAYLOR I/O MODULE COMPLETE 
6247BP10710 TAYLOR INPUT MODULE COMPLETE
6247BP10710 TAYLOR INPUT MODULE COMPLETE
635165-02 ALLEN BRADLEY
635165-02 ALLEN BRADLEY
635165-02 ALLEN BRADLEY
635165-02 ALLEN BRADLEY
64 point output module
64 point output module in
64 point output module in
64 point output module in
650nm 300mw true output power Red dot laser module diode device semiconductor 
6657  Allen-Bradley 1746-0A8 Output Module
6709  In Box Allen-Bradley 1756-IB8 SER A Output Module
6742 -No Box Allen-Bradley 1746-NO4V Analog Output Module
6742 -No Box Allen-Bradley 1746-NO4V Analog Output Module
6ES5441-7LA11 Siemens Digital Output Module 
6ES7 322-1BL00-0AA0
6ES7322-8BH10-?0AB0 SIMATIC S7/PCS7 SM 322 DIGITAL OUTPUT MODULE
6ES7322-8BH10-?0AB0 SIMATIC S7/PCS7 SM 322 DIGITAL OUTPUT MODULE
6ES7332-7ND00-0AA0
6ES7332-7ND00-0AA0
7 NICE MODICON OUTPUT MODULES MODEL AS-B824-016
7000-ST TOTAL CONTROL 9 IN. OPERATOR INTERFACE
7000-ST TOTAL CONTROL 9 IN. OPERATOR INTERFACE
7000-ST TOTAL CONTROL 9 IN. OPERATOR INTERFACE
7000-ST TOTAL CONTROL 9 IN. OPERATOR INTERFACE
7000-ST TOTAL CONTROL 9 IN. OPERATOR INTERFACE
7000-ST TOTAL CONTROL 9 IN. OPERATOR INTERFACE
7000-ST-OEM TOTAL CONTROL
7000-ST-OEM TOTAL CONTROL
7000-ST-OEM TOTAL CONTROL
7000-ST-OEM TOTAL CONTROL
701B DATA INSTUMENTS
701B DATA INSTUMENTS
7296 -No Box Grayhill 70-ODC5 Output Module 60Vdc 3.5A
7296 -No Box Grayhill 70-ODC5 Output Module 60Vdc 3.5A
7297 -No Box Opto 22 ODC5 Output Module 60Vdc 1.5A
7297 -No Box Opto 22 ODC5 Output Module 60Vdc 1.5A
7300-ACRT2 ALLEN BRADLEY
7300-ACRT2 ALLEN BRADLEY
7300-ACRT2 ALLEN BRADLEY
7300-ACRT2 ALLEN BRADLEY
7500XE EPRO EATON CORPORATION CUTLER HAMMER OPERATOR INTERFACE PC
7500XE EPRO EATON CORPORATION CUTLER HAMMER OPERATOR INTERFACE PC
7500XE EPRO EATON CORPORATION CUTLER HAMMER OPERATOR INTERFACE PC
750-556 WAGO 2CH OUTPUT MODULE  IN BOX
76561-16 PMD 300 REV D --  -- 1 YEAR WARRANTY
76561-16 PMD 300 REV D --  -- 1 YEAR WARRANTY
77139-003-51 Allen Bradley Circuit Board . 
77139-003-51 Allen Bradley Circuit Board . 
77139-003-51 Allen Bradley Circuit Board . 
8 GE Input and Output Modules 115VAC and 24VDC
8 OPTO 22 ODC5 OUTPUT RELAY MODULES
80 20 M23955 NSPP M23955
8000CRT ALLEN BRADLEY
8000CRT ALLEN BRADLEY
8000CRT ALLEN BRADLEY
8000CRT ALLEN BRADLEY
8000VFAZ ALLEN BRADLEY DISPLAY MONITOR
8000XLCVD TOSHIBA
8000XLCVD TOSHIBA
8000XLCVD TOSHIBA
8000XLCVD TOSHIBA
800-12-3-SM STATIC CONTROLS CORP OPERATOR INTERFACE 
800-12-3-SM STATIC CONTROLS CORP OPERATOR INTERFACE 
800-12-3-SM STATIC CONTROLS CORP OPERATOR INTERFACE 
800-2-4-3-4 STATIC CONTROL CORP OPERATOR INTERFACE DISP
800-2-4-3-4 STATIC CONTROL CORP OPERATOR INTERFACE DISP
800-5-4-SM STATIC CONTROL CORP OPERATOR INTERFACE DISPL
800-5-4-SM STATIC CONTROL CORP OPERATOR INTERFACE DISPL
800-5-4-SM STATIC CONTROL CORP OPERATOR INTERFACE DISPL
800T-PC416 Ser. N Allen Bradley A-B Cluster Panel Light 120v Lot of 4@+PC316
800T-PC416 Ser. N Allen Bradley A-B Cluster Panel Light 120v Lot of 4@PC316
8030-ROM-122 OUTPUT MODULE ANALOG 4POINT ISOLATED  07873
8030-ROM-122 OUTPUT MODULE ANALOG 4POINT ISOLATED  07873
8200 ALLEN BRADLEY
8200 ALLEN BRADLEY
851S-1 ROCKWELL COLLINS - SYNTHESIZER OUTPUT MODULE - p/n 635-4930-001
851S-1 ROCKWELL COLLINS - SYNTHESIZER OUTPUT MODULE - p/n 635-4930-001
851S-1 ROCKWELL COLLINS - SYNTHESIZER OUTPUT MODULE - p/n 635-4930-002
851S-1 ROCKWELL COLLINS - SYNTHESIZER OUTPUT MODULE - p/n 635-4930-002
8520-CRTC ALLEN BRADLEY
8520-CRTC ALLEN BRADLEY
8520-CRTC ALLEN BRADLEY
8520-CRTC1 ALLEN BRADLEY
8520-CRTC1 ALLEN BRADLEY
8520-CRTC1 ALLEN BRADLEY
8520-MOP ALLEN BRADLEY
8520-MOP ALLEN BRADLEY
8520-MOP7 ALLEN BRADLEY
8520-MOP7 ALLEN BRADLEY
8520-MOP7 ALLEN BRADLEY
8520-MOP7 ALLEN BRADLEY
8520-OPS1 ALLEN BRADLEY
8520-OPS1 ALLEN BRADLEY
8520-OPS1 ALLEN BRADLEY
8520-OPS1 ALLEN BRADLEY
8520-VCRT ALLEN BRADLEY
8520-VCRT ALLEN BRADLEY
8520-VCRT ALLEN BRADLEY
8520-VCRT ALLEN BRADLEY
8520-VOP 9 SERIES COLOR MONITOR Allen Bradley 1 156757 REV 1 BRAND 
8520-VOP 9 SERIES COLOR MONITOR Allen Bradley 1 156757 REV 1 BRAND 
8520-VOP 9 SERIES COLOR MONITOR Allen Bradley 1 156757 REV 1 BRAND 
8520-VOP ALLEN BRADLEY
8520-VOP ALLEN BRADLEY
8520-VOP1 ALLEN BRADLEY
8520-VOP1 ALLEN BRADLEY
8520-VOP1 ALLEN BRADLEY
86000P1 ALLEN BRADLEY
86000P1 ALLEN BRADLEY
86000P1 ALLEN BRADLEY
86000P1 ALLEN BRADLEY
86002213X0B 86002213X
86002213X0B 86002213X
86002213X0B 86002213X
8A High Output Motorcycle Harley Accent Wireless Module
8A High Output Motorcycle Harley Accent Wireless Module
8A OUTPUT CUSTOM HAREY BOLY LIGHT UPGRADE REMOTE MODULE
9  SCHNEIDER ELECTRIC ZBY2002 "STANBY" LEGEND PLATE 22MM 
9  SCHNEIDER ELECTRIC ZBY2002 "STANBY" LEGEND PLATE 22MM 
9  SCHNEIDER ELECTRIC ZBY2002 STANBY LEGEND PLATE 22MM 
9 Indramat CTA 10-1 Operator Interface Pads CTA10.1B-001-F?W
9" CRT for Industrial Process Control Mono Tube
9" CRT for Industrial Process Control Mono Tube
9" CRT TUBE FOR MONOCHROME MONITOR CD-1035EM CD-1038M D9MM-11A DMB-095 KF-M7099H
9" CRT TUBE FOR MONOCHROME MONITOR CD-1035EM CD-1038M D9MM-11A DMB-095 KF-M7099H
9" CRT TUBE FOR MONOCHROME MONITOR CD-1035EM CD-1038M D9MM-11A DMB-095 KF-M7099H
9" CRT TUBE FOR MONOCHROME MONITOR CD-1035EM CD-1038M D9MM-11A DMB-095 KF-M7099H
9" CRT TUBE FOR MONOCHROME MONITOR MDT-925PS MDT-941 MDT941B-2A MDT941D TR-9DD1B
9" CRT TUBE FOR MONOCHROME MONITOR MDT-925PS MDT-941 MDT941B-2A MDT941D TR-9DD1B
9" CRT TUBE FOR MONOCHROME MONITOR MDT-925PS MDT-941 MDT941B-2A MDT941D TR-9DD1B
9" CRT TUBE FOR MONOCHROME MONITOR MDT-925PS MDT-941 MDT941B-2A MDT941D TR-9DD1B
9001KP1R31 Ser J Pilot Light Red Square D 110-120Vac NIB  
9001KP1R31 Ser J Pilot Light Red Square D 110-120Vac NIB  
900-M-4-18-120?-P-120 STATIC CONTROL CORP
9100-5512 Power Module 240VAC input 47-53Hz - 8VAC output at 1.0A max V76
91-00935-00 MODICON
91-00935-00 MODICON
91-00935-00 MODICON
91-00935-00 MODICON
91-01064-00 MODICON MONITOR
91-01064-00 MODICON MONITOR
91-01064-00 MODICON MONITOR
91-01064-00 MODICON MONITOR
91-01094-00 MODICON MONITOR
91-01430-00 MODICON MONITOR 6MOS.WRTY
91-01430-00 MODICON MONITOR 6MOS.WRTY
91-01430-00 MODICON MONITOR 6MOS.WRTY
91-01538-01 MODICON
91-01538-01 MODICON
91-01538-01 MODICON
92-01203-01 MODICON
92-01203-01 MODICON
92-01203-01 MODICON
92-01203-01 MODICON
92-01273-09 Cutler Hammer PanelMate 1500 1575 LR86414
92-01273-09 Cutler Hammer PanelMate 1500 1575 LR86414
92-01758-09 Cutler Hammer PanelMate 1500
92-01758-09 Cutler Hammer PanelMate 1500
9406AC XYCOM
9406AC XYCOM
9406AC XYCOM
9406AC XYCOM
9450 XYCOM MONITOR/CRT 1YR WRTY
9450 XYCOM MONITOR/CRT 1YR WRTY
9450 XYCOM MONITOR/CRT 1YR WRTY
9450 XYCOM MONITOR/CRT 1YR WRTY
9450 XYCOM MONITOR/CRT 1YR WRTY
9450 XYCOM MONITOR/CRT 1YR WRTY
9460 XYCOM 1 YR WARRANTY
9460 XYCOM 1 YR WARRANTY
9460 XYCOM 1 YR WARRANTY
9460 XYCOM 1 YR WARRANTY
9465-KPM XYCOM
9465-KPM XYCOM
9486 XYCOM MONITOR LCD TOUCH SCREEN 1YR
9486 XYCOM MONITOR LCD TOUCH SCREEN 1YR
9487 XYCOM LCD MONITOR TOUCH SCREEN 1Y
9487 XYCOM LCD MONITOR TOUCH SCREEN 1Y
9487 XYCOM LCD MONITOR TOUCH SCREEN 1Y
9487 XYCOM LCD MONITOR TOUCH SCREEN 1Y
9782S HONEYWELL ANALYZER 9782S-OM-RO-E1?001-BD
9782S HONEYWELL ANALYZER 9782S-OM-RO-E1?001-BD
9782S HONEYWELL ANALYZER 9782S-OM-RO-E1?001-BD
9782S HONEYWELL ANALYZER 9782S-OM-RO-E1?001-BD
9800-AC-AB-1-1 QUARTECH
9800-AC-AB-1-1 QUARTECH
9800-AC-AB-1-1 QUARTECH
9800-AC-AB-1-1 QUARTECH
A full featured MODBUS OPC DA 2.0 server. Serial TCP/IP
A full featured MODBUS OPC DA 2.0 server. Serial TCP/IP
A/B Output Module 12 to 120 V AC  1771-OAD lot of 3
A1S62DA Mitsubishi PLC 2 Point Analog Output Module
A1SC30NB Mitsubishi PLC HMI  In Box Cable
A1SH42 Mitsubishi PLC 32 Point DC Input  32 Point DC Output Module 64 I/O
A1SH42-S1 Mitsubishi PLC 32 Point DC Input  32 Point DC Output Module A1SH42S1
A1SY10 Mitsubishi Output module
A1S-Y22 Mitsubishi PLC  In Box Triac Output Module A1SY22
A1SY41 Mitsubishi PLC 32 Point DC Output Module A1S-Y41
A1SY42 Mitsubishi PLC 64 Point Output Module A1S-Y42
A1S-Y71  In Box Mitsubishi PLC Output Module Module A1SY71
A1S-Y71  In Box Mitsubishi PLC Output Module Module A1SY71
A1S-Y71  In Box Mitsubishi PLC Output Module Module A1SY71
A1S-Y80  In Box Mitsubishi PLC Output Module Module A1SY80
A2T15T40XPK4NN?IB DYNICS MONITOR 1YR WARRANTY
A2T15T40XPK4NN?IB DYNICS MONITOR 1YR WARRANTY
A61L-0001-0072 FANUC
A61L-0001-0072 FANUC
A61L-0001-0072 FANUC
A61L-0001-0072 FANUC
A61L-0001-0094 GE FANUC
A61L-0001-0094 GE FANUC
A61L-0001-0094 GE FANUC
A61L-0001-0094 GE FANUC
A61L-0001-0095 FANUC
A61L-0001-0095 FANUC
A61L-0001-0095 FANUC
A61L-0001-0096 FANUC 1 YR WARRANTY
A61L-0001-0096 FANUC 1 YR WARRANTY
A61L-0001-0168 FANUC
A61L-0001-0168 FANUC
A61L-0001-0168 FANUC
A61L-0001-0168?-71 FANUC
A61L-0001-0168?-71 FANUC
A61L-0001-0168?-71 FANUC
A86L-0001-0137 Fanuc Keyboard / Fujitsu Limited N860-3127-T010  
A86L-0001-0137 Fanuc Keyboard / Fujitsu Limited N860-3127-T010  
A86L-0001-0137 Fanuc Keyboard / Fujitsu Limited N860-3127-T010  
A8GT-J61BT15 Mitsubishi PLC HMI  In Box A8GTJ61BT15
A8GT-MCA3MFDW Mitsubishi PLC HMI  In Box Memory Casette A8GTMCA3MFDW
A8GT-MCA3MFDW Mitsubishi PLC HMI  In Box Memory Casette A8GTMCA3MFDW
A956GOT-LBD-M3 Mitsubishi PLC HMI  In Box A956GOTLBDM3
A956GOT-LBD-M3 Mitsubishi PLC HMI  In Box A956GOTLBDM3
AA ELECTRIC AAE-A301-M USPP AAEA301M
AAMES SECURITY PS-LPCO-048 NSPP PSLPCO048
AARELL 02J800 NSPP 02J800
AARELL 02J802 NSPP 02J802
ABCO PRODUCTS 04752 NSFP 04752
ABL SURSUM 1G15UM USPP 1G15UM
ABL SURSUM 2D10UM USPP 2D10UM
ABL SURSUM 2D25UM USPP 2D25UM
ABL SURSUM 3GU20 USPP 3GU20
ABL SURSUM V-EA51-G1.6A USPP VEA51G16A
ABL SURSUM V-EA51-G15A USPP VEA51G15A
ABL SURSUM V-EA51-G5A USPP VEA51G5A
ABL SURSUM V-EA52-G1-6A USPP VEA52G16A
ABL SURSUM V-EA52-G6A USPP VEA52G6A
ABL SURSUM V-EA53-G6A USPP VEA53G6A
ABPLCAnalogOutputModule1746-NO8V
ABPLCAnalogOutputModule1746-NO8V
ABPLCAnalogOutputModule1769-OF8C
ABPLCAnalogOutputModule1769-OF8C
ABPLCAnalogOutputModule1794-OE12
ABPLCAnalogOutputModule1794-OE12
ABPLCModuleAnalogOutput1769-OF2
ABPLCModuleAnalogOutput1769-OF2
ABPLCOutputModule1746-NO8I
ABPLCOutputModule1746-NO8I
ABPLCOutputModule1746-OB32
ABPLCOutputModule1746-OB32
ABPLCOutputModule1769-OF4CI
ABPLCOutputModule1769-OF4CI
ABPLCOutputModule1794-OB32P
ABPLCOutputModule1794-OB32P
ABRACON ACH10000MHZEK FNFP ACH10000MHZEK
ABRACON ACOL-3.6864MHZ?-EK FNFP ACOL36864MHZEK
AC DELCO 41-908 NSFP 41908
AC DELCO GF124 NSFP GF124
AC DELCO R43TS NSFP R43TS
ACCU-SEAL 617-0005 NSFP 6170005
ACCU-SORT AS OPERATOR PANEL 2355 41698-000A 16045
ACCU-SORT AS OPERATOR PANEL 2355 41698-000A 16045
ACCU-SORT AS OPERATOR PANEL 2355 41698-000A 16045
ACE 2-221 NSFP 2221
ACE 2-465 NSFP 2465
ACE TA-22-10 NSPP TA2210
ACEagleMultiprocessorBoxWE9102
ACEagleMultiprocessorBoxWE9102
ACER KB-2971 USPP KB2971
ACI 104198 USPP 104198
ACI 9737A0245 NSPP 9737A0245
ACI ACD-4247 USPP ACD4247
ACM8 Altronix 8 Output Access Power Controller Module