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. Further, IEC 60870-5-103 can be
used at the same time with the IEC 61850 protocol.
DNP3 supports both serial and TCP modes for connection to
one master. Further, changing of the active setting group is
supported. DNP3 can also be used at the same time with the
IEC 61850 protocol.
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
Table 4. Supported station communication interfaces and protocols
Interfaces/Protocols
Ethernet
Serial
100BASE-TX RJ-45
100BASE-FX LC
RS-232/RS-485
Fibre-optic ST
IEC 61850
●
●
-
-
MODBUS RTU/ASCII
-
-
●
●
MODBUS TCP/IP
●
●
-
-
DNP3 (serial)
-
-
●
●
DNP3 TCP/IP
●
●
-
-
IEC 60870-5-103
-
-
●
●
● = Supported
Transformer Protection and Control
1MRS757846 A
RET620
Product version: 2.0
ABB
17
