scheider electric MiCOM P746, Technical Manual

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SCADA Communications P746/EN SC/G31
MiCOM P746 (SC) 13-
21
SC
MODBUS Register Name Description
3x00800 N
o
of stored
disturbances
Indicates the total number of disturbance
records currently stored in the relay, both
extracted and unextracted.
3x00801 Unique identifier of
the oldest
disturbance record Indicates the unique identifier value for
the oldest disturbance record stored in
the relay. This is an integer value used in
conjunction with the ‘N
o
of stored
disturbances’ value to calculate a value
for manually selecting records.
4x00250 Manual disturbance
record selection
register
This register is used to manually select
disturbance records. The values written
to this cell are an offset of the unique
identifier value for the oldest record. The
offset value, which ranges from 0 to the
N
o
of stored disturbances – 1, is added to
the identifier of the oldest record to
generate the identifier of the required
record.
4x00400 Record selection
command register
This register is used during the extraction
process and has a number of commands.
These are:
b0 – Select next event
b1 – Accept event
b2 – Select next disturbance record
b3 – Accept disturbance record
b4 – Select next page of disturbance
data
b5 – Select data file
3x00930 – 3x00933 Record time stamp These registers return the timestamp of
the disturbance record.
3x00802 N
o
of registers in
data page
This register informs the master station of
the number of registers in the data page
that are populated.
3x00803 – 3x00929 Data page registers These 127 registers are used to transfer
data from the relay to the master station.
They are 16-bit unsigned integers.
3x00934 Disturbance record
status register
The disturbance record status register is
used during the extraction process to
indicate to the master station when data
is ready for extraction. See next table.
4x00251 Data file format
selection This is used to select the required data
file format. This is reserved for future
use.
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).