GE P444 User Manual

P44x/EN SC/H
b6
SCADA Communications
(SC) 12
-24 MiCOM P40 Agile
P442, P444
MODBUS Register Name Description
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).
The disturbance record status register will report one of the following values:
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 unextracted
disturbances
An attempt was made by the master station to automatically select the
next oldest unextracted 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.
3.6.2 Extraction procedure
The following procedure will be used to extract disturbances from the relay. The procedure
is split into four sections:
1. Selection of a disturbance – either manually or automatically
2. Extraction of the configuration file
3. Extraction of the data file
4. Accepting the extracted record (automatic extraction only)
3.6.2.1 Manual extraction procedure
The procedure used to extract a disturbance manually is shown in the following figure. The
manual method of extraction does not allow for the acceptance of disturbance records.

GE P444 Specifications

General

Brand	GE
Model	P444
Category	Protection Device
Language	English