Modbus Memory Map; Reading The Event Recorder; Reading Transient Recorder - GE 869 Communications Manual

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Digital Energy
869 Motor Protection System
Chapter 11: Modbus Memory Map

Reading the Event Recorder

Reading Transient Recorder

869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE

Modbus Memory Map

To read the entire event recorder contents (the only available format), use the following
filename:
Evt.evt
Familiarity with the Transient recorder feature is required to understand the following
description.
The Oscillography_ Number_of_Triggers register is incremented by one every time a new
oscillography file is triggered (captured) and cleared to zero when oscillography data is
cleared. When a new trigger occurs, the associated oscillography file is assigned a file
identifier number equal to the incremented value of the register; the newest file number is
equal to the Oscillography_Number_of_Triggers register. This register can be used to
determine if any new data has been captured by periodically reading it to see if the value
has changed; if the number has increased then new data is available.
The Oscillography Number of Records register specifies the maximum number of files (and
the number of cycles of data per file) that can be stored in the memory of the relay.
The Oscillography Available Records register specifies the actual number of files that are
stored and still available to be read out of the relay. Writing "Yes" (i.e. the value 1) to the
Oscillography Clear Data register clears oscillography data files, clears both the
Oscillography Number of Triggers and Oscillography Available Records registers to zero,
and sets the Oscillography Last Cleared Date to the present date and time.
To read binary COMTRADE oscillography files, read the following filenames:
OSCnnnn.CFG and OSCnnn.DAT
Replace the "nnn" with the desired oscillography trigger number. For ASCII format, use the
following filenames:
OSCAnnnn.CFG and OSCAnnn.DAT
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