Note:
Register addresses are provided in reference code + address format. E.g. 4x00001 is reference code 4x, address 1
(which is specified as function code 03, address 0x0000 in the MODBUS specification).
The disturbance record status register will report one of the following values:
Disturbance record states
State Description
Idle
This will be the state reported when no record is selected; such as after power on or after a record has been
marked as extracted.
Busy The relay is currently processing data.
Page ready The data page has been populated and the master station can now safely read the data.
Configuration complete All of the configuration data has been read without error.
Record complete All of the disturbance data has been extracted.
Disturbance overwritten
An error occurred during the extraction process where the disturbance being extracted was overwritten by a
new record.
No non-extracted disturbances
An attempt was made by the master station to automatically select the next oldest non-extracted disturbance
when all records have been extracted.
Not a valid disturbance An attempt was made by the master station to manually select a record that did not exist in the relay.
Command out of sequence The master station issued a command to the relay that was not expected during the extraction process.
9.6.1 MANUAL EXTRACTION PROCEDURE
The procedure used to extract a disturbance manually is shown below. The manual method of extraction
does not allow for the acceptance of disturbance records.
Chapter 7 - SCADA Communications MiCOM P747
214 P747-TM-EN-1
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