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Hiprom Technologies 1769HP-GPS User Manual

Global positioning & timing module
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1769
-GPS
HP

USER MANUAL

Rev 1.1 – June 2005

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Summary of Contents for Hiprom Technologies 1769HP-GPS

  • Page 1: User Manual

    1769 -GPS USER MANUAL Rev 1.1 – June 2005...

  • Page 2: Table Of Contents

    1769HP-GPS - User Manual Rev 1.0 Table of Contents Chapter 1 Introduction.......................3 Chapter 2 Module Accessories ..................4 Chapter 3 Module Operation.....................5 Chapter 4 Installing the Module ..................7 Chapter 5 Configuring the Module ..................8 Chapter 6 I/O Address Map ....................15 Chapter 7 Module Status ....................22...

  • Page 3: Chapter 1 Introduction

    1769HP-GPS - User Manual Rev 1.0 INTRODUCTION CHAPTER 1 The 1769HP-GPS module provides accurate time and position information and services for the Allen-Bradley 1769 platform (CompactLogix or MicroLogix 1500). The module makes use of Global Positioning System (GPS) technology to derive accurate time which is synchronized with the atomic clocks located on the GPS satellites.

  • Page 4: Chapter 2 Module Accessories

    • 5m RG58 patch lead with a SMA male and TNC male connector on either end • 3.3V active 50Ω bullet antenna • 1769HP-GPS user manual MO DULE G P S G lobal P ositioning & Tim ing Module Figure 2.1 : 1769HP-GPS module with antenna and patch-lead Page 4 of 51...

  • Page 5: Chapter 3 Module Operation

    1769HP-GPS - User Manual Rev 1.0 MODULE OPERATION CHAPTER 3 The 1769HP-GPS module is designed to operate within the Allen-Bradley 1769 backplane. All power required for the module’s operation is derived from the 1769 backplane. MO DULE Status LEDs G P S...
  • Page 6 1769HP-GPS - User Manual Rev 1.0 The current status of the module is conveyed to the user by means of the 2 bi-color Status LED’s. The following information is available to the user directly across the backplane by means of a scheduled connection: •...

  • Page 7: Installing The Module

    : Should a longer patch lead be required it is recommended that a GPS signal NOTE booster is used. Contact your local Hiprom Technologies distributor for assistance. Attach the patch lead SMA (male) to the module’s SMA (female) connector. It is not recommended that the antenna patch lead exceed a total loss of 10dB at 1.5GHz, as this...

  • Page 8: Configuring The Module

    MicroLogix 1500 uses RSLogix 500, two different setup procedures are explained below. CompactLogix (RSLogix 5000) A direct connection between the controller and the 1769HP-GPS module is required to transfer I/O data to and from the module. In addition the module supports various unconnected messages that can be used to retrieve particular information.
  • Page 9 1769HP-GPS - User Manual Rev 1.0 Figure 5.1 : Right-click on I/O Configuration and select New Module Figure 5.2 : Select Generic 1769 Module ( 1769HP-GPS MODULE ) Page 9 of 51...
  • Page 10 1769HP-GPS - User Manual Rev 1.0 Figure 5.3 : Configure module’s parameters Figure 5.4 : Right-click on CompactBus Local and select Properties Page 10 of 51...
  • Page 11 1769HP-GPS - User Manual Rev 1.0 Figure 5.5 : Configure CompactBus module’s RPI (Requested Packet Interval) Once a modules configuration data has been downloaded to the controller, it will attempt to establish a connection with the module. A connection will fail if there is inappropriate configuration data.
  • Page 12 1769HP-GPS - User Manual Rev 1.0 MicroLogix 1500 (RSLogix 500) A direct connection between the controller and the 1769HP-GPS module is required to transfer I/O data to and from the module. Establishing the Direct Connection This section describes the procedures necessary to configure the 1769HP-GPS module within the MicroLogix 1500 system.
  • Page 13 1769HP-GPS - User Manual Rev 1.0 Figure 5.6 : Left-click on Read I/O Config Before the IO can be read, a connection must be established between RSLogix and the PLC system (Micrologix 1500). Figure 5.7 : Left-click on Read I/O Config...
  • Page 14 1769HP-GPS - User Manual Rev 1.0 Figure 5.8 : Confirmation that the 1769HP-GPS module has been identified Page 14 of 51...

  • Page 15: Chapter 6 I/O Address Map

    I/O ADDRESS MAP CHAPTER 6 The input and output image of the 1769HP-GPS module is defined in the following sections. Appendix A and B provide example code and recommended structures that can be used to extract and view the data.
  • Page 16 1769HP-GPS - User Manual Rev 1.0 Input Image Description Field/Value Description Location Type Visible Sky CompactLogix: 0 = Sky not visible or no satellite signals Local:s:I.Data[0].0 present 1 = Satellite signals available MicroLogix 1500: I:e.0/0 No sky usually indicates that the antenna does not have a clear view of the sky, such as in a building, etc.
  • Page 17 1769HP-GPS - User Manual Rev 1.0 CompactLogix: Date / Time Valid Local:s:I.Data[0].8 0 = Date Time Not Valid 1 = Date Time synchronized with GPS MicroLogix 1500: I:e.0/8 CompactLogix: Local:s:I.Data[0].9-12 Satellite count SV Count Number of Satellites currently being tracked MicroLogix 1500: I:e.0/9-12...
  • Page 18 1769HP-GPS - User Manual Rev 1.0 or CompactLogix: Local:s:O.Data[1]) MicroLogix 1500: I:e.5 CompactLogix: Calendar Month Local:s:I.Data[6] Current Local Calendar Month ( 1 - 12 ) Month MicroLogix 1500: This is dependent on the configured time zone (MicroLogix 1500: O:e.1 I:e.6 or CompactLogix: Local:s:O.Data[1])
  • Page 19 1769HP-GPS - User Manual Rev 1.0 Fixed co-ordinate system. The Z-axis is defined as the vector with origin at the earth's centre and passing through the North pole. Only Valid if the PEC flag (I:e.0/13) = 1 Current Northerly Velocity Velocity North / 10 (in m/s) Velocity –...
  • Page 20 1769HP-GPS - User Manual Rev 1.0 Updated in conjuction with "Channel" described above Satellite Signal Strength on current channel CompactLogix: A measure of the satellite signal strength calculated during signal Local:s:I.Data[17].0-7 SV Signal correlation. Strength MicroLogix 1500: Signal Strength in (dbHz x 10 ) after correlation. Updated in conjuction I:e.17/0-7...
  • Page 21 1769HP-GPS - User Manual Rev 1.0 Output Image WORD Reserved Time Zone (Hours x 10) Reserved Reserved Figure 6.2 : Connected Output Image Output Image Description Field Description Location Type Select Earth-Centred-Earth-Fixed Mode CompactLogix: Setting this bit causes the module to report position and Local:s:O.Data[0].0...

  • Page 22: Chapter 7 Module Status

    1769HP-GPS - User Manual Rev 1.0 MODULE STATUS CHAPTER 7 The following sections describe the various status of the module and how they may be determined via the 2 bi-color (Green / Red ) LEDs. Status LEDs DESCRIPTION STATUS MEANING...

  • Page 23: Appendix Aplc Ladder Example

    1769HP-GPS - User Manual Rev 1.0 PLC LADDER EXAMPLE APPENDIX A The 1769HP-GPS module is supported by Allen Bradley’s MicroLogix 1500 and CompactLogix PLC systems. Thus ladder examples for RSLogix 500 and RSLogix 5000 are given below. A.1. RSLogix 500...
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  • Page 34 1769HP-GPS - User Manual Rev 1.0 A.2. RSLogix 5000 This Appendix provides a detailed description of recommended data structures that can be used in conjunction with the provided example ladder logic given below. The following example code (and structures) can be downloaded from the Hiprom website.
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  • Page 41 1769HP-GPS - User Manual Rev 1.0 A.2.1. Recommended Input Image Structures Data of the 1769HP-GPS can be presented clearly by manipulating and copying the input image to the GPS user-defined data type (UDT) structure. This structure utilizes the following embedded UDT structures (detailed below) •...
  • Page 42 1769HP-GPS - User Manual Rev 1.0 GPS_Satellite_Information Name Data Type Style SV_Count Decimal Channel Decimal SV PRN Decimal SV_Signal_Strength Decimal Table A.3 : GPS_Satellite_Information UDT GPS_Time Name Data Type Style MilliSecond Decimal Second Decimal Minute Decimal Hour Decimal Decimal Month...
  • Page 43 1769HP-GPS - User Manual Rev 1.0 GPS_Polar_Velocity Name Data Type Style Northerly_Velocity Decimal Easterly_Velocity Decimal Upward_Velocity Decimal Table A.7 : GPS_Polar_Velocity UDT GPS_Cartesian_Velocity Name Data Type Style X_Velocity Decimal Y_Velocity Decimal Z_Velocity Decimal Table A.8 : GPS_Cartesian_Velocity UDT Page 43 of 51...

  • Page 44: Appendix B Specifications

    1769HP-GPS - User Manual Rev 1.0 SPECIFICATIONS APPENDIX B Parameter Specification General Module Location Any Slot Electrical Backplane Current 165mA @ 5.0V Schedules Connection Paramters 1ms to 750ms GPS Receiver Specification General L1 frequency (1575.42 MHz), C/A code (Standard Positioning Service), 8-channel, continuous tracking...

  • Page 45: Appendix Cgps Operation

    The cold-start search algorithm applies to a 1769HP-GPS receiver which has no memory of its previous session (i.e., is powered on without the memory backup circuit connected to a source of DC power). This is the “out of the box”...
  • Page 46 Hot Start 4.3.3 A hot start strategy applies when the 1769HP-GPS receiver has been powered down for less than 60 minutes, and the almanac, position, ephemeris, and time are valid. The hot start search strategy is similar to a warm start, but since the ephemeris data in memory is considered current and valid, the acquisition time is typically less than 20 seconds.
  • Page 47 SNR Mask 4.4.2 Although the 1769HP-GPS receiver is capable of tracking signals with SNRs as low as 0, the default SNR mask is set to 3 to eliminate poor quality signals from the fix computation and minimize constellation switching. Low SNR values may result from: •...
  • Page 48 1769HP-GPS - User Manual Rev 1.0 Position Accuracy GPS position accuracy is degraded by atmospheric distortion, satellite geometry, satellite clock errors, and receiver clock errors. Effective models for atmospheric distortion of satellite signals have been developed to minimize the impact of tropospheric and ionospheric effects.

  • Page 49: Appendix D Time Standards

    TIME STANDARDS APPENDIX D There are many different time standards used in the world today. This chapter describes the different formats and standards used in the 1769HP-GPS module and how the relate to one another. D.1 GPS Time By synchronizing with the atomic clocks on GPS satellites the 1769HP-GPS module is able to compute accurate GPS time.

  • Page 50: Appendix E Glossary

    1769HP-GPS - User Manual Rev 1.0 GLOSSARY APPENDIX E Communications format Format that defines the type of information transferred between an I/O module and its owner controller. This format also defines the tags created for each /O module Download The process of transferring the contents of a project on the workstation into the controller...
  • Page 51 1769HP-GPS - User Manual Rev 1.0 Producer/consumer Intelligent data exchange system devices in which the GPS module produces data without having been polled first. Requested packet interval (RPI) A configurable parameter which defines when the module will multicast data Service...

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