ABB RET615 Product Manual page 23

ABB
Transformer Protection and Control
RET615
Product version: 4.0
managed switch with rapid 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.
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
1MRS756891 F
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