For successful protection relay engineering and usage, check the workstation
firewall TCP and UDP port configurations, especially for IEC 61850, FTP and
MTP. Other protocols are not used for engineering and/or they are optional.
Table 21: Ports that must be open in the firewall for different protocols
Protocol
TCP port
File Transfer Protocol (FTP and FTPS) 20, 21
IEC 61850 102
Simple Network Time Protocol (SNTP) 123
Modbus TCP 502
If there is an abrupt disconnection (removing of the communication cable) during
an ongoing FTP/FTPS session, it takes 15–20 minutes for a fresh session to be
successfully established.
8.4.1.1 Setting up IP addresses
The IP address and the corresponding subnet mask can be set via LHMI for the rear
Ethernet interface in the protection relay. Each Ethernet interface has a default
factory IP address when the complete protection relay is delivered.
1. Set the IP address for the protection relay's rear port and the corresponding
subnet mask via the LHMI path Configuration/Communication/Ethernet/
Rear port.
Table 22: Default IP address for the rear port and the corresponding subnet mask
IP address
Subnet mask
192.168.2.10 255.255.255.0
8.4.2 Communication settings
The protection relay is provided with a USB port on the LHMI. This port is mainly
used for configuration and setting purposes. The rear port IP address and the
corresponding subnet masks can be set via the LHMI. The front port uses MTP for
communicating with the connected computer. The rear Ethernet interface has a
factory default IP address 192.168.2.10 when the complete protection relay is
delivered.
Rear port Ethernet is intended for station bus communication. RS-485/RS-232
twisted pair can also be used for rear port communication. Protocol available for
serial communication is Modbus RTU.
For more information, see the communication protocol manual and
the technical manual.
Section 8 2NGA000823 A
Commissioning
72 REX610
Operation Manual
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