Technical Guide P92x/EN CT/E11
Modbus Protocol
MiCOM P921-P922-P923 Page 13/118
1.7 MiCOM P921-P922-P923 database organisation
1.7.1 Description of the MODBUS application mapping
Pages 0 to 8 : Contain the MiCOM P921-P922-P923 parameters.
Pages 9 to 3Dh : Contain the data of the event records, data of the fault value
records, and data of the disturbance records, these pages are only available for
MiCOM P922 and P923.
Pages 40h to 4Ah : Contain the data of the frequency disturbance records MiCOM
P923.
These pages are explained in the following way :
Page No Page content Access
Page 0 Information of product, remote signalling, remote
measurements
Reading
Page 1 Remote settings for general parameters Reading & writing
Page 2 Remote settings for protection group number 1 Reading & writing
Page 3 Remote settings for protection group number 2 Reading & writing
Page 4 Remote controls Writing
Page 5 Reserved Not accessible
Page 6 Reserved Not accessible
Page 7 Self tests results Quick reading
Page 8 Synchronisation Writing
Pages 9h
to 21h
Disturbance record data Reading
Page 22h Index frame for the disturbance records Reading
Pages 23h
to 34h
Reserved Not accessible
Page 35h Event record data Reading
Page 36h Data of the oldest event Reading
Page 37h Fault value record data Reading
Pages 38h
to 3Ch
Selection of the disturbance record and selection
of its channel
Reading
Page 3Dh Number of available disturbance records Reading
Page 3Eh Data of the oldest fault value record Reading
Pages 40h
to 4Ah
Data of the frequency disturbance records Reading
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