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metso automation DPU Bus Troubleshooting Manual

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DPU Bus
Troubleshooting
277581 Rev. A1

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Summary of Contents for metso automation DPU Bus

  • Page 1 DPU Bus Troubleshooting 277581 Rev. A1...
  • Page 2 Do not look into the end of an optical cable. EYE DAMAGE CAN RESULT Copyright 1999-2001 by Metso Automation MAX Controls Inc. Printed in the United States of America All Rights Reserved Metso Automation MAX Controls • • • • 277581 • • • •...

  • Page 3: Table Of Contents

    DPU Bus Cable Status............................3-2 Token Pass Rate ..............................3-2 Using the DPU Bus Map Display.......................... 3-2 Using IGAP, UGAP Buttons, etc........................3-4 Using the DPU Bus Statistics Display........................3-5 Metso Automation MAX Controls • • • • 277581 • • • •...
  • Page 4 DPU Bus Troubleshooting CHAPTER 4........................4-1 Troubleshooting Tips and Pointers..........................4-1 Troubleshooting Prerequisites........................... 4-1 Troubleshooting Pointers and Reminders......................4-2 Metso Automation MAX Controls • • • • 277581 • • • •...

  • Page 5: Preface

    DPU Bus network and have configured the DPU Bus using maxTOOLS software accessible from the maxSTATION. To verify DPU Bus operation after you logically configure a DPU Bus and to troubleshoot the DPU Bus, you will view standard system status displays accessible via maxVUE Runtime, which runs as a Windows NT package on the maxSTATION.

  • Page 6: Chapter 1

    Devices assigned to a given DPU Bus, DPUs and DBMs, are referred to as stations. They are configured and defined using maxTOOLS accessible from a maxSTATION.
  • Page 7 DBM 1 DBM 2 Maximum length of electrical spur: 15 stations 200 feet from OEI maximum per to Terminator electrical spur Figure 1-1. Optical DPU Bus Architecture Metso Automation MAX Controls • • • • 277581 • • • •...

  • Page 8: Three Dpu Bus Networking Approaches

    Wrap-back OEI Network Figure 1-2. DPU Bus Special Cases Three DPU Bus Networking Approaches The DPU Bus can be implemented in three ways, a fiber optic ring with redundant electrical spurs, a “Wrap-back OEI” network, or an “Electrical- only” network.

  • Page 9: Fiber Optic Ring Network

    The total length of electrical cable on one electrical spur must not exceed: • • • • 200 feet from OEI to male terminator • • • • 100 feet from female to male terminator (Electrical DPU Bus only) Metso Automation MAX Controls • • • • 277581 • • • •...

  • Page 10: Understanding Oeis

    When no stations on the local electrical data spur are transmitting, the OEI functions as an optical repeater. Optical data appears as both bidirectional data and ring data on the local electrical DPU Bus. See Figure 1-4. An OEI can exist on an optical DPU Bus without being connected to an electrical DPU Bus.
  • Page 11 Greater than 3300 ft. (1.0 Remove Jumper Less than 3900 ft. (1.2 km) Less than 3300 ft. (1.0 km) *No longer supplied for new installations. Figure 1-3.Optical-Electrical Interface with Terminations Metso Automation MAX Controls • • • • 277581 • • • •...
  • Page 12 DPU Bus Basics, an Introduction Figure 1-4. Local Station Not Transmitting Figure 1-5. Local Station Transmitting Metso Automation MAX Controls • • • • 277581 • • • •...

  • Page 13: Station Categories

    Model 552 Controller File and earlier models System Monitor Functionality DPU Bus Modules (DBM) view all traffic on the entire DPU Bus network. DBMs can obtain DPU Bus performance and status information and detect faults. System monitors can initialize a DPU Bus when stations are added or deleted and can restart the token passing procedure after any interruption.
  • Page 14 Stations are assigned to traffic loops by giving them an address for a specific loop. System monitors (DBMs) are assigned to the high loop of the DPU Bus since these devices usually require large amounts of data. They are not guaranteed access to the DPU Bus at fixed time intervals.

  • Page 15: Token Passing And Dpu Bus Mastership

    This is permissible if they are not on the same DPU Bus. In this case, it is possible to assign the same station address to a system monitor in each DPU Bus to which it is connected.

  • Page 16: Stallout

    However, the token is monitored by the system monitors to ensure proper operation and to report and correct any malfunctions. Stallout A stallout is defined as the loss of token passing on a DPU Bus which exists for more than 500 microseconds. Only system monitors can detect and correct a stallout.

  • Page 17: Go-Ahead Pointers And Station Addresses

    These addresses are identified as the "next address" and the "permanent next address" and are shown on the DPU Bus Map display, Figure 3-2. The "next address" is the address of the next station with which this station has succeeded in establishing communications.

  • Page 18: Performing An Igap

    DPU Bus Basics, an Introduction Note: Do not attempt to install a DBM or DPU on an IGAP'd highway. The DPU Bus must be UGAP'd first to permit the DBM or DPU to get time and date as it is booting up.

  • Page 19: Chapter 2

    48 hours before being shipped. You should verify system performance after the units are installed and connected to ensure that your DPU Bus is functioning properly and to provide a benchmark with which to compare future tests. As part of the verification process: •...

  • Page 20: Verification Procedure Overview

    DPU Bus, it may be more practical to use your established configuration. • • • • A DPU Bus and the system resources assigned to the DPU Bus should be defined. • • • •...
  • Page 21 When a station has been restarted (power-down/power-up or reset), it returns to the DPU Bus in the UGAP’d condition. To UGAP a DPU Bus, return to the DPU Bus Map Display and select the UGAP button at the bottom left side of the display.

  • Page 22: Dpu Bus Maintenance

    In this case the verification period is 12 hours. It is not necessary to IGAP the system and a printout is not needed. This procedure can also be used to isolate DPU Bus problems if they occur. The verification procedure should be performed under the ideal conditions indicated earlier in this chapter.

  • Page 23: Chapter 3

    DPU Bus Map • • • • DPU Bus Statistics This chapter discusses how you may best use these displays for DPU Bus troubleshooting. For a fuller discussion of each display, refer to Publication 277557, maxSTATION Operator's Guide. Using the System Status Display Access the System Status display to confirm that your DPU Bus network and the associated maxNET network have no cable breaks.

  • Page 24: Maxnet Status

    DPU Bus. Token Pass Rate The Token Pass Rate of the DPU Bus appears to the right of the DPU Bus loop indicators. This reports the number of times per second the selected DBM device receives the token.
  • Page 25 PERM Address of the next station to which this station will try to pass the token; if the DPU Bus is UGAP'd, this will usually be this station's address plus one. If the DPU Bus is IGAP'd, this will be the next station that has responded before (see NEXT above).

  • Page 26: Using Igap, Ugap Buttons, Etc

    If you are adding new stations, you should UGAP the DPU Bus, verify that the new stations are performing correctly, and then IGAP the DPU Bus again. Metso Automation MAX Controls • • • • 277581 • • • •...

  • Page 27: Using The Dpu Bus Statistics Display

    Locate a desired station listed on the display and click the associated Statistics button. The top area of the display shows the station generating the statistics, the DPU Bus that the station is on, and its node number (DPU Bus address). The display features the following fields: Field Name...
  • Page 28 The number of times this station could not complete a transaction and retried to complete it; includes token passes to non-existent stations. Unexplained errors The number of frames received with errors not categorized above. Metso Automation MAX Controls • • • • 277581 • • • •...
  • Page 29 Electrical cable changes The number of changes in counterclockwise electrical cable status; complete to broken or broken to complete. Metso Automation MAX Controls • • • • 277581 • • • •...
  • Page 30 DPU Bus Troubleshooting Figure 3-5. DPU Bus Statistic Display Metso Automation MAX Controls • • • • 277581 • • • •...
  • Page 31 • • • • A copy of the DPU Bus Map display. Copies of the DPU Bus Statistics displays may also be useful if cable breaks are intermittent or there are other communication alarms. For DPU Bus Statistics displays to be useful, the following sequence should...
  • Page 32 Low Loop B Controller Files and DPUs IGAPing (Initialize Go Ahead Pointer) is an optimization routine which makes a good DPU Bus run better; however, it will not fix a DPU Bus with communications problems due to defective hardware. The token is passed in logical numerical sequence regardless of where a station is physically located.
  • Page 33 Each station receives the token at least twice per second. Messages are broadcast simultaneously on the CW and CCW sides of the DPU Bus; the first side to receive valid carrier is used to receive the message. Jumper between terminal board location TB1-6 and 7 on an OEI for a given optical cable length: refer to the following table to obtain the correct jumper setting for a given length of cable.

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