Relay Courier Database; Setting Transfer Mode - GE P741 Technical Manual

SCADA Communications
MiCOM P741, P742, P743
Control Commands
Select Setting Group
Change Device Address*
Set Real Time
Note:
2.3

Relay courier database

The Courier database is a two dimensional structure with each cell in the database being
referenced by a row and column address. Both the column and the row can take a range
from 0 to 255. Addresses in the database are specified as hexadecimal values; e.g. 0A02 is
column 0A (10 decimal) row 02. Associated settings/data will be part of the same column,
row zero of the column contains a text string to identify the contents of the column, i.e. a
column heading.
P74x/EN MD contains the complete database definition for the relay. For each cell location
the following information is stated:
−
Cell text
−
Cell datatype
−
Cell value
−
Whether the cell is settable, if so
−
Minimum value
−
Maximum value
−
Step size
−
Password level required to allow setting changes
−
String information (for Indexed String or Binary flag cells)
2.4 Setting changes
(See R6512, Courier User Guide - Chapter 9)
There are three categories of settings within the relay database:
−
Control and support
−
Disturbance recorder
−
Protection settings group
Setting changes made to the control and support settings are implemented immediately and
stored in non-volatile memory. Changes made to either the disturbance recorder settings or
the protection settings groups are stored in a 'scratchpad' memory and are not immediately
implemented by the relay.
To action setting changes stored in the scratchpad the save changes cell in the configuration
column must be written to. This allows the changes to either be confirmed and stored in
non-volatile memory, or the setting changes to be aborted.
2.4.1

Setting transfer mode

If it is necessary to transfer all of the relay settings to or from the relay a cell within the
communication system data column can be used. This cell (location BF03) when set to 1
makes all of the relay settings visible. Any setting changes made, with the relay set in this
mode, are stored in scratchpad memory (including control and support settings). When the
value of BF03 is set back to 0 any setting changes are verified and stored in non-volatile
memory.
Commands indicated with a * are not supported via the front Courier
port.
P74x/EN SC/Na7
(SC) 13-15
SC