Alstom MiCOM P846, Technical Manual

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SCADA Communications P846/EN SC/D
MiCOM P846 (SC) 13-7
SC
essages from he ma er control station are
accepted by only one relay. DNP 3.0 uses a decimal number between 1 and 65519 for the
relay address. It is imp
o relays have the same DNP 3.0 address. The DNP
3.0 address is then use station to communicate with the relay.
The next cell down the column controls the baud rate to be used:
Baud rate
Up to 32 relays can be connected to one DNP 3.0 spur, and therefore it is necessary for
each relay to have a unique address so that m
t st
ortant that no tw
d by the master
9600 bits/s
DNP 3.0 communication is asynchronous. Six baud rates are supported by the relay
None
‘1200bits/s’, ‘2400bits/s’, ‘4800bits/s’, ’9600bits/s’, ‘19200bits/s’ and ‘38400bits/s’. It is
important that whatever baud rate is selected on the relay is the same as that set on the
DNP 3.0 master station.
The next cell down the column controls the parity format used in the data frames:
Parity
The parity can be set to be ‘Even’. It is important that whatever parity
format is selected on th that set on the DNP 3.0 master station.
The next cell down the col hronization request from the master by the
relay:
one of ‘None’, ‘Odd’ or
e relay is the same as
umn sets the time sync
Time Sync.
Enabled
The time sync. can be set to either enabled or disabled. If enabled it allows the DNP 3.0
master to synchronize the time.
1.3 Fiber optic converter
An optional fiber optic card is available in this product. This converts the EIA(RS)485
protocols into a fiber optic output. This communication card is available for use on Courier
and DNP3.0 it adds the following setting to the communication column.
This controls the physical media used for the communication:
Physical link
EIA(RS)485
The default setting is to select the electrical EIA(RS)485 connection. If the optional fiber
optic connectors are fitted to the relay, then this setting can be changed to ‘Fiber optic’. This
cell is also invisible if a second rear comms. port, or Ethernet card is fitted, as it is mutually
exclusive with the fiber optic connectors, and occupies the same physical location.
1.4 Second rear commun
For relays with Courier col on the first rear communications port there is the
hardware option of a second rear communications port, which will run the Courier language.
pair K-Bus (non-polarity sensitive),
r EIA(RS)232.
The settings for this port are located immediately below the ones for the first port as
described in previous sections of P846/EN IT. Move down the settings until the following
sub heading is displayed.
ication port (SK4)
or DNP3.0 proto
This can be used over one of three physical links: twisted
twisted pair EIA(RS)485 (connection polarity sensitive) o