R.4.5
Date Code 20111215 Reference Manual SEL-421 Relay
Communications Interfaces
Communications Card
Once installed in an SEL-421, the Ethernet card settings become part of the
relay settings. The card cannot be set directly–it must be set as relay PORT 5.
The settings needed for network operation and data exchange protocols,
including DNP3 and IEC 61850, are available in the PORT 5 settings.
The Relay Word bit CCOK indicates that a connected communications card
(SEL-2702) is operating normally. The CCOK bit asserts if all of the
following actions occur.
➤ A communications card is detected as installed.
➤ The communications card reports no diagnostic failures.
➤ The continuous “are you alive?” self-test is acknowledged
within a specified time.
Ethernet Network
Operation Settings
Several settings control how the SEL-421 with the optional Ethernet card
operates on an Ethernet network. These settings include IP addressing
information, network port fail-over options, and network speed.
Network Configuration
Use the network configuration settings shown in Table 4.3 to configure the
SEL-421 for operation on an IP network and to set other parameters affecting
the physical Ethernet network interface operation.
Table 4.3 Ethernet Card Network Configuration Settings
Label Description Range Default
IPADDR IP network address IP address 192.92.92.92
SUBNETM IP network subnet mask IP address 255.255.255.0
DEFRTR Default router IP address NA
ETCPKA
a
a
This setting applies only to IEC 61850 communications.
TCP keep-alive functionality enable
a
Y, N N
KAIDLE Length of time to wait
with no detected activity
before sending a keep-alive packet
1–20 s
(must be
greater than
or equal to
KAINTV)
10
KAINTV Length of time to wait between sending
keep-alive packets after receiving no
response for the prior keep-alive packet
1–20 s
(must be
less than or
equal to
KAIDLE)
1
KACNT Maximum number of
keep-alive packets to send
1–20 6
NETPORT Primary network port
(D disables all network ports)
A, B, D A
FAILOVR Automatic fail-over enable Y, N Y
FTIME Fail-over time out 5–65535 ms 5
NETASPD
b
b
This setting applies only to twisted-pair ports (10/100BASE-T).
Network speed or auto-detect on Port A A, 10 Mbps,
100 Mbps
A
NETBSPD
b
Network speed or auto-detect on Port B A, 10 Mbps,
100 Mbps
A
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