GE EPM 9650/9800 manual Chapter EPM Log Formats, Log Formats Overview

Chapter 6

EPM Log Formats

6.1: Log Formats Overview

Historical Log 1: Historical Log 1 will fill to the total allocated memory. The number of records possible in Historical Log 1 is the total memory allocated divided by the record size (size of a Historical Log 1 snapshot).

Historical Log 2: Historical Log 2 will fill to the total allocated memory. The number of records possible in Historical Log 2 is the total memory allocated divided by the record size (size of a Historical Log 2 snapshot).

Limit Trigger Log: The Limit Tirgger Log is designed to hold as many records as will fill either the Limit Snapshot or Limit Trigger Logs, whichever fills first. A one-for-one relationship is maintained between two logs. If the Limit Snapshot Log can only hold 256 snapshots, then only the first 256 Limit Trigger records will be used, even if the allocated memory for the Limit Trigger Log could hold 1024 records.

Limit Snapshot Log: The Limit Snapshot Log will hold as many records as will fill either the Limit Snapshot or Limit Trigger Logs, whichever fills first. A one-for-one relationship is maintained between the two logs. The maximum number of records possible in the Limit Snapshot Log is the total memory allocated divided by the record size (size of a Historical Log 1 snapshot). If the Limit Trigger Log can only hold 1024 records, and the Limit Snapshot Log can hold up to 2048 snapshots, only the first 1024 snapshots will be used. If the Limit Snapshot Log can only hold 256 snapshots, then the only the first 256 records in the Limit Trigger Log will be used.

Waveform Trigger Log: The Waveform Trigger Log is designed to hold as many records as will fit in the Waveform Samples Log. A one-for-one relationship is maintained between the three waveform logs. If the Samples Log can only hold 96 captures, then only the first 96 triggers will be used, even if the allocated memory for the Triggers Log could hold 128 records.

Waveform Samples Log: The Waveform Samples Log will fill to the total allocated memory. The number of records possible in the Waveform Samples Log is the total memory allocated divided by the record size. Records in the Waveform Samples Log do not contain timestamps. Time Stamp Mode will not work on accesses to this log. Instead, use Time Stamp Mode to access the Waveform Triggers Log.

Power Quality (CBEMA) Log: The PQ Log records in response to surges and sags of programmed High Speed Limit Triggers on enabled High Speed channels. The information it provides allows the calculation of duration and magnitude of the surges and sags as well as information for locating the start and end of the surge and sag in the Waveform Captures.

Digital Input Log: The Digital Input Snapshot Log stores records in order to document the transitions of Internal and External Digital Inputs.

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