ABB Relion REM615 Product Manual page 18

Motor Protection and Control
REM615
Product version: 3.0
spanning tree protocol (RSTP) support to be
created. The managed switch controls the
consistency of the loop, routes the data and
corrects the data flow in case of a
communication disturbance. The IEDs in the
ring topology act as unmanaged switches
forwarding unrelated data traffic. The
Ethernet ring solution supports the
connection of up to thirty 615 series IEDs. If
more than 30 IEDs are to be connected, it is
recommended that the network is split into
several rings with no more than 30 IEDs per
ring. The self-healing Ethernet ring solution
avoids single point of failure concerns and
improves the reliability of the
communication. The solution can be applied
for the Ethernet-based IEC 61850, Modbus
and DNP3 protocols.
All communication connectors, except for the
front port connector, are placed on integrated
optional communication modules. The IED
can be connected to Ethernet-based
communication systems via the RJ-45
connector (100Base-TX) or the fibre-optic LC
connector (100Base-FX). If connection to a
serial bus is required, the 10-pin RS-485 screw-
terminal or the fibre-optic ST connector can
be used.
Modbus implementation supports RTU, ASCII
and TCP modes. Besides standard Modbus
functionality, the IED supports retrieval of
time-stamped events, changing the active
setting group and uploading of the latest fault
records. If a Modbus TCP connection is used,
five clients can be connected to the IED
simultaneously. Further, Modbus serial and
Modbus TCP can be used in parallel, and if
required both IEC 61850 and Modbus
protocols can be run simultaneously.
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The IEC 60870-5-103 implementation
supports two parallel serial bus connections
to two different masters. Besides basic
standard functionality, the IED supports
changing of the active setting group and
uploading of disturbance recordings in IEC
60870-5-103 format.
DNP3 supports both serial and TCP modes
for connection to one master. Further,
changing of the active setting group is
supported.
When the IED uses the RS-485 bus for the
serial communication, both two- and four
wire connections are supported. Termination
and pull-up/down resistors can be configured
with jumpers on the communication card so
external resistors are not needed.
The IED supports the following time
synchronization methods with a time-
stamping resolution of 1 ms:
Ethernet-based:
• SNTP (Simple Network Time Protocol)
With special time synchronization wiring:
• IRIG-B (Inter-Range Instrumentation Group
- Time Code Format B)
In addition, the IED supports time
synchronization via the following serial
communication protocols:
• Modbus
• DNP3
• IEC 60870-5-103
1MRS756890 D
Issued: 2010-06-29
ABB