Alstom MiCOM P546 - 1.3.4 Configuring the IEC 60870-5-103 rear port, RP1

SCADA Communications P54x/EN SC/La4
MiCOM P543, P544, P545 & P546 (SC) 13-13
SC
1.3.4 Configuring the IEC 60870-5-103 rear port, RP1
The IEC specification IEC 60870-5-103: Telecontrol Equipment and Systems, Part 5:
Transmission Protocols Section 103 defines the use of standards IEC 60870-5-1 to
IEC 60870-5-5 to perform communication with protection equipment. The standard
configuration for the IEC 60870-5-103 protocol is to use a twisted pair EIA(RS)485
connection over distances up to 1000 m. The relay operates as a slave in the system,
responding to commands from a master station.
To use the rear port with IEC 60870-5-103 communication, the relay’s communication
settings must be configured. The port is configured using the relay’s communication setting.
These are accessed using the front panel user interface keypad, display, and menu
software. Using the menu software, firstly check that the ‘Comms. Settings’ cell in the
‘CONFIGURATION’ column is set to ‘Visible’, then move to the ‘COMMUNICATIONS’
column. The settings that apply to the rear port using IEC 60870-5-103 are described below.
Navigate down the ‘COMMUNICATIONS’ column from the column heading to the first cell to
confirm the communication protocol:
RP1 Protocol
IEC60870-5-103
The next cell sets the address of the relay on the IEC 60870-5-103 network:
RP1 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 address.
The 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:
RP1 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:
RP1 Meas 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.
An optional fiber optic card is available in the MiCOM P54x to allow optical connection to the
IEC 60870-5-103 communication to be made over an optical connection. When fitted, it
converts between EIA(RS)485 signals and fiber optic signals and the following cell is visible
in the menu column:
RP1 Physical link
Copper