1769HP-GPS
GPS Precision Timing
Hiprom Technologies presents the 1769HP-GPS for the Allen-Bradley CompactLogix and Micrologix1500 platforms. By harnessing the power of the Global Positioning System, this module is able to provide precision timing information across the 1769 backplane. Other GPS information is also available including Position, Velocity and GPS receiver status.
Module Configuration
The 1769HP-GPS module connects directly to the 1769 bus, deriving all required power from the backplane. The on-board GPS receiver connects to an external active antenna by means of an antenna patch lead. These items are supplied with the module. In order to achieve the maximum timing accuracy the GPS module should be located as close as possible to the CompactLogix or MicroLogix1500 processor (CPU).
Timing
Precision time is provided across the backplane by means of a scheduled connection between the GPS module and CompactLogix CPU. The time data is formatted in Year, Month, Day, Hour, Minute, Second and Millisecond for ease of use. This time can also be configured to follow a local time zone and thus accommodate daylight saving. Time will be synchronous to other GPStime sources.
Sequence of Events Recording
One millisecond accurate Sequence of Events Recording can easily be achieved in the CompactLogix CPU by executing a simple ladder routine in a 1ms periodic task. For this purpose it is recommended that the GPS module used for Sequence of Event generation be located as close as possible to the CPU.
Position and Velocity
The 1769HP-GPS module also provides GPS position and velocity fixes. Position data is available in both polar co-ordinates of Longitude , Latitude and altitude as well as in Cartesian Earth-Centered-Earth- Fixed (ECEF) coordinates X,Y and Z. Similarly velocity is available in Northerly, Easterly and Upward velocity components as well as ECEF Vx,Vy and Vz. Change of Base Algorithms can be supplied to translate position & velocity to a local coordinate system. The internal GPS receiver provides position updates every second with a horizontal accuracy of less than 6m (50%). Higher precision options are available on the 1769HP-GPS module. For details please contact your local distributor.
Status
All module and GPS status information is available across the backplane. This includes the number of satellites locked, validity of GPS data as well as the location and signal strength of each satellite being tracked. An LED display located on the front of the module provides the user with the basic status of the GPS receiver and module.
