Alstom MiCOM P846, Техническое руководство

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P846/EN SC/D SCADA Communications
(SC) 13-6
MiCOM P846
SC
tion protocol:
Protocol
Courier
Move down the ‘Communications’ column from the column heading to the first cell down
which indicates the communica
The next cell down the column controls the address of the relay:
Remote address
1
Since up to 32 relays can be connected to one K-bus spur, as indicated in Figure 2, it is
necessary for each relay to have a unique address so that messages from the master control
station are accepted by one relay only. Courier uses an integer number between 0 and 254
for the relay address, which is set with this cell. It is important that no two relays have the
same Courier address. The Courier address is then used by the master station to
communicate with the relay. Default value of remote address is 255 and must be changed to
a value in the range of 1 to 254 before use.
The next cell down controls the inactivity timer:
Inactivity timer
10.00 mins.
The inactivity timer controls how long the relay will wait without receiving any messages on
the rear port before it reverts to its default state, including revoking any password access
that was enabled. For the rear port this can be set between 1 and 30 minutes.
Note that protection and disturbance recorder settings that are modified using an on-line
editor such as PAS&T must be confirmed with a write to the ‘Save changes’ cell of the
‘Configuration’ column. Off-line editors such as MiCOM S1 do not require this action for the
setting changes to take effect.
1.2.3 DNP3.0 communication
The DNP 3.0 protocol is defined and administered by the DNP User Group. Information
about the user group, DNP 3.0 in general and protocol specifications can be found on their
website:
www.dnp.org
The relay operates as a DNP 3.0 slave and supports subset level 2 of the protocol plus some
of the features from level 3. DNP 3.0 communication is achieved via a twisted pair
EIA(RS)485 connection to the rear port and can be used over a distance of 1000m with up to
32 slave devices.
To use the rear port with DNP 3.0 communication, the relay’s communication settings must
be configured. To do this use the keypad and LCD user interface. In the relay menu firstly
check that the ‘Comms. setting’ cell in the ‘Configuration’ column is set to ‘Visible’, then
move to the ‘Communications’ column. Four settings apply to the rear port using DNP 3.0,
which are described below. Move down the ‘Communications’ column from the column
heading to the first cell that indicates the communications protocol:
Protocol
DNP
3.0
The next cell controls the DNP 3.0 address of the relay:
DNP 3.0 address
232