P341/EN O/B11 Operation Guide
CHAPTER 1 Introduction
Page 20/22 MiCOM P341
Note: *May vary according to relay type/model
twisted pair connection over distances up to 1000m. As an option for IEC 60870-5-
103, the rear port can be specified to use a fibre optic connection for direct
connection to a master station. The relay operates as a slave in the system,
responding to commands from a master station. The method of communication uses
standardised messages which are based on the VDEW communication protocol.
To use the rear port with IEC 60870-5-103 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 settings’ cell in the
‘Configuration’ column is set to ‘Visible’, then move to the ‘Communications’ column.
Four settings apply to the rear port using IEC 60870-5-103 which are described
below. Move down the ‘Communications’ column from the column heading to the
first cell which indicates the communication protocol:
Protocol
IEC 60870-5-103
The next cell down controls the IEC 60870-5-103 address of the relay:
Remote address
162
Up to 32 relays can be connected to one IEC 60870-5-103 spur, and therefore 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. IEC 60870-5-103 uses an integer
number between 0 and 254 for the relay address. It is important that no two relays
have the same IEC 60870-5-103 address. The IEC 60870-5-103 address is then
used by the master station to communicate with the relay.
The next cell down the column controls the baud rate to be used:
Baud rate
9600 bits/s
IEC 60870-5-103 communication is asynchronous. Two baud rates are supported by
the relay, ‘9600 bits/s’ and ‘19200 bits/s’. It is important that whatever baud rate is
selected on the relay is the same as that set on the IEC 60870-5-103 master station.
The next cell down controls the period between IEC 60870-5-103 measurements:
Measure’t period
30.00 s
The IEC 60870-5-103 protocol allows the relay to supply measurements at regular
intervals. The interval between measurements is controlled by this cell, and can be
set between 1 and 60 seconds.
The next cell down the column controls the physical media used for the
communication:
Physical link
RS485
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