7.9
Date Code 20081022 Instruction Manual SEL-787 Relay
Communications
Communications Protocols
Ethernet Protocols
As with other communications interfaces, you must choose a data exchange
protocol that operates over the Ethernet network link in order to exchange
data. The relay supports FTP, Telnet, Ping, Modbus/TCP, IEC 61850, and
DNP3 LAN/WAN protocols.
You should carefully design your Ethernet network to maximize reliability,
minimize system administration effort, and provide adequate security. Work
with a networking professional to design your substation Ethernet network.
FTP Server
Use the single FTP (File Transfer Protocol) session to access the following
files:
➤ CFG.XML—Configuration read-only file in XML format
➤ CFG.TXT—Configuration read-only file in TXT format
➤ ERR.TXT—Error read-only file in TXT format
➤ SET_61850.CID—IEC 61850 CID read-write file
➤ SET_xx.TXT—Setting files in TXT format
FTP is a standard TCP/IP protocol for exchanging files. A free FTP
application is included with most web browser software. You can also obtain a
free or inexpensive FTP application from the Internet. When you connect to
the relay Ethernet port, you will find files stored in the root (top-level)
directory.
Telnet Server
Use the Telnet session (TPORT default setting is port 23) to connect to the
relay to use the protocols, which are described in more detail below:
➤ SEL ASCII
➤ Compressed ASCII
➤ Fast Meter
➤ Fast Operate
Telnet is a terminal connection across a TCP/IP network that operates in a
manner very similar to a direct serial port connection to one of the relay ports.
As with FTP, Telnet is a part of TCP/IP. A free Telnet application is included
with most computer operating systems, or you can obtain low-cost or free
Telnet applications on the Internet.
Ping Server
Use a Ping client with the relay Ping server to verify that your network
configuration is correct.
Ping is an application based on ICMP over an IP network. A free Ping
application is included with most computer operating systems.
IEC 61850
Use as many as six sessions of MMS over a TCP network to exchange data
with the relay. Use GOOSE to do real-time data exchange with as many as
16 incoming messages and 8 outgoing messages. For more details on the
IEC 61850 protocol, see Appendix F: IEC 61850 Communications.
NOTE: Use the QUIT command prior
to closing the Telnet-to-Host session
to set the relay to Access Level 0.
Otherwise the relay will remain at an
elevated access level until TIDLE
expires.
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