Register Mapping; Event Extraction - GE MiCOM P40 Agile Technical Manual

Chapter 17 - Communications
6.4.4

REGISTER MAPPING

The device supports the following memory page references:
Memory Page: Interpretation
●
0xxxx: Read and write access of the output relays
●
1xxxx: Read only access of the opto inputs
●
3xxxx: Read only access of data
●
● 4xxxx: Read and write access of settings
where xxxx represents the addresses available in the page (0 to 9999).
A complete map of the MODBUS addresses supported by the device is contained in the relevant menu database,
which is available on request.
Note:
The "extended memory file" (6xxxx) is not supported.
Note:
MODBUS convention is to document register addresses as ordinal values whereas the actual protocol addresses are literal
values. The MiCOM relays begin their register addresses at zero. Therefore, the first register in a memory page is register
address zero. The second register is register address 1 and so on.
Note:
The page number notation is not part of the address.
6.4.5

EVENT EXTRACTION

The device supports two methods of event extraction providing either automatic or manual extraction of the
stored event, fault, and maintenance records.
6.4.5.1 AUTOMATIC EVENT RECORD EXTRACTION
The automatic extraction facilities allow all types of record to be extracted as they occur. Event records are
extracted in sequential order including any fault or maintenance data that may be associated with the event.
The MODBUS master can determine whether the device has any events stored that have not yet been extracted.
This is performed by reading the status register 30001 (G26 data type). If the event bit of this register is set then the
device has non-extracted events available. To select the next event for sequential extraction, the master station
writes a value of 1 to the record selection register 40400 (G18 data type). The event data together with any fault/
maintenance data can be read from the registers specified below. Once the data has been read, the event record
can be marked as having been read by writing a value of '2' to register 40400.
6.4.5.2 MANUAL EVENT RECORD EXTRACTION
There are three registers available to manually select stored records and three read-only registers allowing the
number of stored records to be determined.
40100: Select Event
●
● 40101: Select Fault
40102: Select Maintenance Record
●
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