ii
••
Table of Contents
2000590-001
Table of Contents,
Continued
Parts Catalog
57
Introduction
Available Parts
58
Power Supply Assembly Removal
59
Data Hiway Testing
61
Definitions of Important Terms
63
Chapter 5:
Appendix
Glossary
Страница 1: ...December 2000 User s Manual 2000590 001 Siemens Applied Automation Siemens Applied Automation Advance Network Gateway with Ethernet ANG_EN ...
Страница 2: ...tion warranty or guarantee of any method product or device by Siemens Applied Automation Reproduction or translation of any part of this publication beyond that permitted by Sections 107 and 109 of the United States Copyright Act without the written consent of the copyright owner is unlawful Inquiries regarding this manual should be addressed to Siemens Applied Automation Technical Communications ...
Страница 3: ...7 AC Power Mains Connections 18 Data Hiway Connections 20 Ethernet Connections 23 Data Communication Setup 25 Introduction 25 Configuring Your PC 26 Establishing a Connection 30 Setting Network Address Loop and Unit Numbers 33 Assigning an IP Address 37 Editing the Address Translation Table 38 Firm Updates 43 Command Summary 45 Troubleshooting 47 ANCB Description 48 ANCB LEDs Description Operation...
Страница 4: ...ntents 2000590 001 Table of Contents Continued Parts Catalog 57 Introduction 57 Available Parts 58 Power Supply Assembly Removal 59 Data Hiway Testing 61 Definitions of Important Terms 63 Chapter 5 Appendix Glossary ...
Страница 5: ...al includes complete instructions for proper and safe installation of the ANG_EN by installation personnel The manual provides the following information Topic Page Chapter 1 Advance Network Gateway 1 Chapter 2 Installation 9 Chapter 3 Data Communication Setup 25 Chapter 4 Troubleshooting 47 Chapter 5 Parts Catalog 57 Appendix Data Hiway Testing 61 Glossary 63 Audience Purpose Chapter Contents ...
Страница 6: ...ice provides a special hot line as an added source of information If you require assistance call Inside Oklahoma 918 662 7430 Outside Oklahoma 800 448 8224 Internationally 001 918 662 7430 Before you call one of our technical support lines Please have the fol lowing information available to help our representative answer your questions 1 Unit Serial Number and Date of Installation 2 Description of...
Страница 7: ... identify conditions or practices that could result in damage to the equipment or other property DANGER indicates a personal injury hazard immediately accessible as one reads the markings CAUTION indicates a personal injury hazard not immediately accessible as one reads the markings or a hazard to property including the equip ment itself This symbol indicates where applicable cautionary or other i...
Страница 8: ...d fire hazard use only a fuse of the correct type voltage rating and current rating as specified in the parts list for your product Use of repaired fuses or short circuiting of the fuse switch is not permitted DO NOT open the equipment to perform any adjustments measure ments maintenance parts replacement or repairs until all power sup plies have been disconnected Only a properly trained technicia...
Страница 9: ...k Gateway Ethernet ANG_EN unit that uses the ANCB Communications Board P N 2020951 001 For Installation instructions for the Advance Net work Gateway ANG_EN that uses the Com 1 board refer to user manual part number 20000579 001 ANG Channel Network Data Advance GC 10BaseT Fiber Optics or Coax Ethernet TCVR Wall Mounted ANG Wall Mounted ANG Data Network APC Advance GC Overview Read This Figure 1 1 ...
Страница 10: ...eway is available in the following configu rations Description SAA Part Number CSA NRTL Div 2 ADH to Ethernet Wall Mount CE Copper 2015840 001 CSA NRTL Div 2 ADH to Ethernet Rack Mount CE Copper 2015838 001 CENELEC ZONE 1 ADH to Ethernet Wall Mount CE Copper 2015850 001 Available Configurations ...
Страница 11: ...63 Hz Single Phase Grounded Neutral 1 Ampere Maximum 100 Watts Input Power Terminal Strip for braided or solid 12 AWG 2 5mm 2 maximum wire size Data Hiway Terminal Strip for dual or single pair Data Hiway cable Interfaces Laptop PC RS 232 9 pin Sub D plug Ethernet 10BASE T standard RJ 45 connector Rack Mounted Package Configuration See Figure 1 2 for Outline Drawing and Dimensions Wall Mounted Pac...
Страница 12: ...m CCA 04 enclosure Electromagnetic and Radio Frequency Compatibility and Electrical Safety CE Compliance certified to 89 336 ECC EMC directive CE Compliance certified to 73 23 EEC Low Voltage directive Tested per EN 61010 1 IEC 1010 1 Housing Materials and Colors Stainless steel 1 4016 Front and top are commercial gray B RAL 7043 housing is light gray RAL 7035 Weight Rack Wall 15 kg 35 pounds appr...
Страница 13: ...tion U S Inches Metric mm A Rack Height 6 15 16 177 B Rack Total Width 19 483 C Rack Mounting Holes Spacing 18 1 4 464 D Rack Depth of Case Only 16 1 4 413 E Rack Depth Including Cable Housing 22 1 8 563 F Handle Depth in Front of Rack 1 3 8 35 L Height of Rear Access Panels 5 127 M Width of Rear Access Panels 7 190 Figure 1 2 Rack Mount Dimensions Dimension Table ...
Страница 14: ...field wiring Figure 1 3 Description U S Inches Metric mm G Wall Depth 7 13 16 199 H Wall Width 17 1 2 444 I Wall Mount Holes Horizontal Spacing 15 9 16 396 D Wall Height of Case Only 16 1 4 413 E Wall Height Including Cable Housing 22 1 8 563 J Wall Mount Holes Vertical Spacing 17 11 16 450 K Left Side Wall Clearance for Door Opening 2 3 8 60 Figure 1 3 Wall Mount Dimensions Dimension Table ...
Страница 15: ...ole left and right 76 3 I Spacing between holes on sides left and right 76 3 J Spacing from center line to outer hole on side left and right 153 6 K Spacing from wall to back cable entry hole top and bottom 76 3 L Spacing from wall to front cable entry hole top and bottom 127 5 M Spacing between front cable entry holes top 102 4 N Spacing between center line and outer cable entry hole top 102 4 O ...
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Страница 17: ...ed may impair the safety protection provided by the equipment Before beginning the installation process read through this Chapter to famil iarize yourself with the installations requirements The following table provides a recommended sequence of events you should follow to ensure a safe and trouble free installation Topic See Page Unpacking and Inspection 10 Pre Installation Planning 11 Wall or Ra...
Страница 18: ...Open unit and visually inspect interior mounted assemblies con nectors and printed circuit boards for damage If there is any damage notify your local Siemens Applied Automation repre sentative Keep all shipping materials as evidence of damage for carrier s inspection Siemens Applied Automation will arrange for immediate repair or replacement Telephone Inside Oklahoma 918 662 7430 Outside Oklahoma ...
Страница 19: ...ing the Advance Network Gateway ANG_EN within an existing LAN consult with the LAN administrator You should also adhere to all the ANG_EN Specification requirements see Chapter 1 Specifications page 3 The ANG_EN is designed for wall or 19 inch rack mounting Figure 2 1 shows the ANG_EN wall mounted in an analyzer house Note that the AC Power Mains breaker is located in close proximity of the ANG_EN...
Страница 20: ... and back to the ADH media All segments of the system labeled Advance Data Hiway are according to standard installation practices 9182 Belden cable or equivalent see Chap ter 1 Specifications page 3 Distant Analyzer House GC GC GC SAA SAA GC APC Control Analyzer House Analyzer House Advance Network Advance Data Hiway Advance Data Hiway Advance Data Hiway GC I O Unit ANG ANG Hub ANG Fiber optics or...
Страница 21: ... a single large system by using appropriate Ethernet hubs The APC Advance Personal Computer must be connected to a standard segment of Advance Data Hiway via the Advance Personal Computer Inter face PCI GC GC ANG FIBER OPTICS HUB ANG GC GC FIBER OPTICS CONVERTER ANG PC 1 I O Unit Analyzer House Distant Analyzer House Control Room APC FIBER OPTICS CONVERTER Advance Data Hiway Advance Data Hiway Adv...
Страница 22: ...ne 1 wall mount The mounting wall must be capable of supporting the weight of the ANG_EN see Chapter 1 Specifications and Figures 1 2 through 1 4 Wall Mount Unit Use four 5 16 inch M8 or 3 8 inch M10 lag bolts to mount the ANG_EN to the wall Mounting bolts must be secured to solid wall construction members such as studs and into the wall only Allow adequate clearance on the left side to allow the ...
Страница 23: ... separate conduit Using flexible conduit and or armored cable is equivalent to using steel conduit Flexible conduit or armored cable must have its flexible conduit and or armoring conductivity 360 degree terminated at its entry to the ANG_EN enclosure or bulkhead If conduit is not used the following installation practices must be used to ensure that the CE certification remains valid 1 A shielded ...
Страница 24: ...ferrite clamp 4 Shielded Ethernet cable must be used for all Ethernet connections in and outside the GC and coupled through the enclosure using a shielded RJ 45 coupler use Siemens Applied Automation part num ber 1183200 003 contained in CE Installation Kit A mounting plate Siemens part number 2020261 001 is also available to accomplish this If needed for Zone 1 installation Siemens Applied Automa...
Страница 25: ...ance Network Communications Board Ethernet Port Two removable wiring access plates permit all the wiring to be made through the bottom section wall units or rear section rack units of the ANG_EN The plates can be punched to accommodate conduit or cable gland connectors For Zone 1 units refer to the Figure 1 4 Zone 1 Out line Drawing ACCESS PLATES AC Power Mains Connections Page 18 Data Hiway Cable...
Страница 26: ...llen wrench 3 Install a 15 Ampere circuit breaker disconnect switch or a receptacle in the power supply line or a switched receptacle near the ANG_EN unit to make sure the unit can be com pletely separated from the power source Label the breaker or receptacle box to make sure that the circuit is clearly identifiable 4 Remove the wiring access plate see Figure 2 5 Punch holes as required for either...
Страница 27: ...Strip the insulation inch back from each of the power supply leads Insert each lead in the correct location and tighten down retaining screws 7 Locate the ANG_EN chassis ground lug and connect wire from it to the building s ground connection 8 Inspect all connections for shorts or loose connections 9 You are now ready to connect the Data Hiway cable con tinue with Data Hiway Connections page 20 ...
Страница 28: ...m cable The cable can be purchased from Siemens Applied Automa tion See the table below for ordering the correct cable Dual Channel Installation Standard Oval Cable Siemens Applied Automation P N 1681000 003 Belden P N SSD1743 Dual Channel Installation Used for larger radius bends Siemens Applied Automation P N 1686002 002 Alpha P N 516689 Single Channel Installation Siemens Applied Automation P N...
Страница 29: ... remove the main voltage to the J1 termi nals To remove all input power to the ANG_EN the AC Power Mains to the ANG_EN needs to be shut off 2 Route the Data Hiway cable to the ANG_EN in accordance with national or local electrical codes and regulations see Figure 2 1 To make the Data Hiway connections easier we have made it a remov able connector Simply grasp the top portion of the connector and p...
Страница 30: ... B Pin 6 Ground Pin 1 Advance Data Hiway cable shields is grounded at one end only If ground is at ANG_EN end use GND terminal 4 Perform Data Hiway Post Installation Test refer to Appen dix A How to Test the Data Hiway 5 Remove the ADH plug connector from board Do not make final connections until you have set the loop and unit num ber see Chapter 3 Data Communications Setup 6 You are now ready for...
Страница 31: ...pe 3 or better twisted pair cable specifications or Category 3 or 5 data grade cabling or better 2 The maximum length of a 10BASE T data cable can not exceed 328 feet 100 meters Typically to increase the distance each ANG_EN will connect to a hub or other type of repeater medium converter 3 The cable should be terminated at both ends with RJ 45 STP male connectors The table below shows the RJ 45 w...
Страница 32: ...Hub to the RJ 45 STP connector on the ANCB board RJ45 STP Connector 2 Place the ANG_EN AC Power Supply Mains circuit breaker to ON On the ANG_EN Power Supply Assembly place toggle ON OFF switch to ON Figure 2 4 3 After the ANG_EN has been connected to a hub and both the ANG_EN and hub have been powered on verify the connection by looking at the LEDs visible on the top card edge of the ANCB see pag...
Страница 33: ...messages across Ethernet to another ADH by way of an Advance Maxum Analyzer or another ANG_EN read through this Chapter prior to performing any procedures This chapter provides the following information Topic Page Configuring Your PC 26 Establishing a Connection 30 Setting Network Address Loop and Unit Numbers 33 Assigning an IP Address 37 Editing the Address Translation Table 38 Firmware Updates ...
Страница 34: ...ttings can also be used Baud rate 57 6k baud Data bits 8 Parity none Stop bits 1 Flow control none The following procedure uses the Windows HyperTerminal program to connect to the ANG_EN 1 Click the Start button and then click on Programs 2 Click the HyperTerminal icon to start the Program The Connection Description dialog box will open 3 In the Name field type in a Connection Name Example Advance...
Страница 35: ...ur PC Continued 5 Click OK The Connect to dialog box opens 6 From the Connect Using scroll list choose the COM port number you will be using on the PC to connect to the ANG_EN configuration port 7 Click OK to save the selection The COM Properties box opens ...
Страница 36: ...ond 57600 Data Bits 8 Parity None Stop bits 1 Flow Control None 9 Click OK The Main Menu will appear 10 Click File and choose Properties from the drop down menu The Advance Network Gateway Properties box will appear 11 Click Setting tab 12 From the Emulation scroll list select VT100 Do not change the de fault settings for the other parameters ...
Страница 37: ...o return to main menu 19 From the Main menu select File Save As The Save AS dialog box will appear 20 Enter the short cut name Click Save to complete the setup Your PC is now setup to connect to the ANG_EN To create a shortcut to the new connection you just entered and place it on your Desktop select the file name entered in step 19 and click the right mouse button From the pop up menu select Crea...
Страница 38: ...data integrity of all configuration data and limits unwanted access of the User s network To access any of the configura tion or diagnostic information the user must log in using the password A password name can consist of any combination of alphanumeric char acters The alphanumeric name must have a minimum of five and a maximum of twenty characters The ANG_EN Communication board is shipped from t...
Страница 39: ...or double click the shortcut icon to start See Configuring PC 2 Press Enter twice The following dialog box appears 3 At the prompt type login password and press Enter The Connect Screen will appear with the log in information and the local prompt The local prompt indicates that your are communicating with the ANG_EN connected directly to the PC 2 0 1 You are now ready to configure the Advance Netw...
Страница 40: ...f the device 1 Open Windows Hyper Terminal program on your PC or double click the shortcut icon to start See Configuring PC 2 Press Enter twice the Command Request dialog box will appear 3 At the prompt type login password IP Address Once the password is verified the system responds with the login infor mation and displays the remote prompt which includes the IP address of the connected ANG_EN Rem...
Страница 41: ...ion Ex xxx xxx xxx xxx subnetmask Subnetting dividing the host ID into a subnet and host ID helps hide the details of an internal net work organization to external routers The sub netmask is used to reduce the size of routing ta bles and restrict broadcast messages to the sub network The subnetmask is a 32 bit value con taining one bits for the network and subnet ID and zero bits for the host ID T...
Страница 42: ... used 1 Log on locally to the ANG_EN The Connect Screen will appear with the log in information and the local prompt The local prompt indicates that your are communicating with the ANG_EN connected directly to the PC 2 0 1 Parameters entered below are not saved until the ANG_EN is reset Even though you are given the option to save after each entry you can make all your entries and then reset to sa...
Страница 43: ...nd save your entry by typing at the Local prompt reset 7 To configure the ANG_EN Loop number at the Local prompt type config loop x Where x is a number in the range from 1 8 depending on the ADH Loop number of the Units to be connected directly to the ANG_EN ADH bus 8 Press Enter and save your entry by typing at the Local prompt reset 9 To configure the ANG_EN Unit number at the Local prompt type ...
Страница 44: ... prompt Type reset This forces the ANG_EN to save the Configuration Information and reboot using the new values The ANG_EN has now been configured To display the current set tings type at Local prompt config display 11 Connect the ANG_EN to the Advance Data Hiway reference page 20 12 Connect the ANG_EN to the network see page 23 ...
Страница 45: ...ods This is referred to as dotted decimal nota tion For example 192 16 9 52 is an IP address Ask your network administrator to assign you an IP Address or if the ANG_EN will be in a closed plant area and not connected to the Internet World Wide Web you can select an address from Table 3 1 See Setting Network Address Loop and Unit Numbers for instructions on how to enter the IP address 192 165 0 1 ...
Страница 46: ...ANG_EN the unit is directly connected to The ATT records are automatically added or updated each time an ADH broadcast is received Each ANG_EN broadcasts it s ATT every 10 minutes This insures the data intgerity of all ATT tables An uninitalized ATT is automatically updated after 10 minutes by receiving ADH broadcasts and ANG_EN ATT broadcasts Only Advance analyzer units broadcast on a periodic ba...
Страница 47: ...figuration Management routines 1 Log on locally to the ANG_EN 2 To display the entire ATT type at the Local prompt display all 3 To display a single Loop only type display adh x Where x is the ADH Loop number Allowable values are 1 8 If you leave off the x value then the Loop number will default to the Loop number of the local ANG_EN Displaying the ATT ...
Страница 48: ...xxx xxx xxx xxx is the IP address If you leave off the IP ad dress the IP portion will default to the value of the local ANG_EN Note 255 255 255 255 and 0 0 0 0 are not allowed 1 To delete a single entry from the ATT type del adh loop unit Where loop is the ADH loop number 1 8 and unit is the ADH unit number 1 31 All parameters must be specified Editing the ATT ...
Страница 49: ...Table Continued 2 To delete all ATT entries associated with a single IP address type del ip xxx xxx xxx xxx Where xxx xxx xxx xxx is the IP address in dotted decimal notation Note 255 255 255 255 and 0 0 0 0 are not allowed 3 To delete all entries in the ATT type delete all ...
Страница 50: ...ed 4 To add entries to the ATT type add adh loop unit Where loop is the ADH loop number 1 8 and unit is the ADH unit number 1 31 All parameters must be specified You can only add entries that are local to the ANG_EN If it is not di rectly connected to the ADH terminals you cannot edit it ...
Страница 51: ... proximately 5 minutes The following procedure assumes that the Windows Hyper Terminal pro gram residing on your PC has been configured the ANG_EN is opera tional and the PC is connected to the ANG_EN 1 Log on to the ANG_EN 2 At the prompt type download You should see the following response on the screen At this point the ANG_EN Communications board is ready to receive the new firmware version 3 F...
Страница 52: ...ill appear 5 Under Files of type select All files 6 Under File name type in the upgrade version file name for this ex ample Gateway hex This will start the down loading of the files Once the download has begun the block numbers will be displayed as they are transmitted The upload will take approximately 5 minutes to complete ...
Страница 53: ... is a number in the range 1 31 format config iproute xxx xxx xxx xxx Where xxx xxx xxx xxx is the IP address format config netmask xxx xxx xxx xxx Where xxx xxx xxx xxx is the IP address Deletes the specified ADH Unit from the Address Translation Table format del all format del adh loop unit Where loop is a number in the range 1 8 Where unit is a number in the range 1 31 format del ip xxx xxx xxx ...
Страница 54: ...out Note The user is automatically logged out after 5 minutes Displays network statistics for Ethernet port Displays the Advance Data Hiway A or B channel status format netstat adh a or netstat adh b Permits a User to alter the User password The password is case sensitive and can be up to 20 alphanumeric char acters long No pass format password stand stand Where stand is the new User supplied pass...
Страница 55: ...ociated in the setup of the Advance Net work Gateway Before beginning the installation process read through this Chapter to familiarize yourself with the information provides Topic See Page ANCB Description 48 ANCB s LEDs Description Operation 49 Ethernet Troubleshooting Guide 52 Guide to Network Health 54 Obtaining Diagnostic Information 55 Overview Chapter Highlights ...
Страница 56: ... Jumpers J10 J11 select the ANG_EN network interface provided to connector J4 J10 connects Port1 on J4 to either the Advance Data Hiway ADH or Advance DataNET Channel A interface J11 connects Port2 on J4 to either the Advance Data Hiway ADH or Advance DataNET Channel B interface J10 J11 are configured for Advance Data Hiway ADH on the ANG_EN board J2 is used to select the 10Base2 termination resis...
Страница 57: ...ooting 49 ANCB LEDs Description Operation This section provides maintenance personnel with information on how to use the ANCB LEDs for troubleshooting the Advance Network Gateway ANG_EN Description Communications Board LEDs ...
Страница 58: ...Action 1 RAM FAILURE Replace Board 2 FLASH FAILURE Reload Firmware or Replace Board 3 ETHERNET FAILURE Replace Board 4 DataNET FAILURE Replace Board 5 OTHER HARDWARE FAILURE Replace Board 6 DUPLICATE IP Change Board IP address 7 CROSS LINK FAILURE Check Cross Link Cable 8 WRONG LOOP Change Loop Number 9 INVALID JUMPER CONFIGURATION Check J10 and J11 Connec tions 10 DUPLICATE UNIT NUMBER Change Uni...
Страница 59: ... provides the 10BaseT and 10Base2 ports The LED s indicate the following information CL Steady Green indicates a FIFO error Steady Red indicates a Collision on the HUB ports Receiving on one port while transmitting another BNC 10Base T Port Blinking Red indicates a packet is being transmitted Blinking Green indicates a packet is being received Alternating Red Green indicates the 10Base2 port is Pa...
Страница 60: ...of Late Collisions are faulty NIC card or a network that is physically too long A network is physically too long if the end to end signal propagation time is greater than the minimum legal sized frame about 57 6 microseconds or 58 bit times 1 cable lengths in excess of the maximum permitted for the cable type 2 faulty connectors or improper cabling 3 excessive numbers of repeaters between network ...
Страница 61: ...or Jabbering can be caused by faulty NIC or driver cabling or grounding problems Possible causes listed by highest probability 1 Faulty Cable Connectors 2 Ground problem Induced noise 3 Faulty NIC or HUB Ghosts Error Possible causes listed by highest probability 1 Poor grounding 2 Improper cable routing ...
Страница 62: ... acceptable utilization threshold 2 The collision rate should be less than 5 Be wary of large bursts of collisions greater than 20 this can be an indicator of severe cabling or component problem 3 Bad FCS errors late collisions jabbers and ghosts should be rare occurrences and should be investigated when they become repetitive These error conditions are typically a result of some kind of problem w...
Страница 63: ...r Terminal program residing on your PC has been configured the ANG_EN is op erational the PC is connected to the ANG_EN and you have logged on To display current Ethernet network diagnostic information 1 Log on to the ANG_EN 2 At the prompt type netstat net The UDP and Interface Statistics screen will appear The display shows the number of packets received and transmitted and the number of errors ...
Страница 64: ..._EN 2 At the prompt type netstat adh a or b The display shows the number of packets received transmitted and the number of errors detected for each of the 31 units on the as signed loop To display an error log specific to each ANG_EN 1 Log on to the ANG_EN 2 At the prompt type errorlog The Most Recent Error log screen appears ADH Channel Information Error Log ...
Страница 65: ... Service Order Entry 500 West Highway 60 Bartlesville Oklahoma 74003 918 662 7370 To ensure an immediate response to your request you should provide the following Purchase order number If ordering by phone a confirming P O should be sent Address where the parts are to be shipped Address where the invoice is to be sent Siemens Applied Automation part numbers as listed Quantity needed of each part E...
Страница 66: ...shown below Part Description Ordering Number Power Supply Base Assembly 2015849 802 ANCB Communication Board Ethernet to Data Hiway Gateway 2020951 801 Debug Port Extension Cable 2020914 001 Power Supply to Circuit Board Cable 2020276 001 Advance Data Hiway Connector 1221007 014 AC Power Connector 1222010 017 Description ...
Страница 67: ...the Power Supply Assembly toggle On Off switch to OFF does not remove the main voltage to the J1 terminals To remove all input power to the ANG_EN the AC Power Mains to the ANG_EN needs to be shut off 3 Remove Power Input Connector and Port 1 2 Connector from board mounted connectors 4 Remove Ethernet connection from the RJ 45 STP connector J2 on the Gateway Communication Board 5 Remove the ANCB r...
Страница 68: ...on the Data Hiway when making continuity checks Perform the check for each device connected to the Data Hiway Do not skip testing any devices connected to the Data Hiway Check at the incoming termination s on the I O chassis the Termination Boards in the Analyzer Electronics enclosures LINC units and any other Data Hiway devices Typical problems are reverse polarity poor contacts on wiring termina...
Страница 69: ...ect 10K ohm resistor to disconnected shield and con nect battery positive lead to resistor Resistor should be in series with the battery Connect battery negative lead to unit ground 3 Connect DVM positive lead to channel A and connect shield and negative to unit ground Measured voltage potential should be 9 Vdc 4 If 9 Vdc is not measured the channel A shield line is grounded at another point corre...
Страница 70: ...ormal occur rence on Ethernet A properly functioning Ethernet will experience a rela tive small percentage of collisions Typically the collision rate should be less than 5 of the available bandwidth Most collisions occur during the preamble portion of the frame Most Ethernet controllers automatically retry up to 15 times any packet that has a collision during transmission Except for Late Collision...
Страница 71: ...rame but does not have a valid beginning of frame pattern start delimiter 10101011 Ground loops and other wiring problems cause some repeaters to be lieve that a frame is being received Since the repeater is only reacting to an AC voltage riding on the cable there is not a valid frame to pass along The repeater however transmits this energy along the network This may be a jam pattern or a very lon...
Страница 72: ...Siemens Applied Automation 500 West Highway 60 Bartlesville OK 74003 Phone 918 662 7000 Fax 918 662 7052 ...
