15.9
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Communications Interfaces
Ethernet Communications
NOTE: The ETCPKA setting applies
to all TCP traffic on Ethernet ports,
including TELNET, FTP, DNP3,
IEC 61850 MMS, and C37.118.
The ETCPKA setting, along with the KAIDLE, KAINTV, and KACNT settings,
can be used to verify that the computer at the remote end of a TCP connection is
still available. If ETCPKA is enabled and the relay does not transmit any TCP
data within the interval specified by the KAIDLE setting, the relay sends a keep-
alive packet to the remote computer. If the relay does not receive a response from
the remote computer within the time specified by KAINTV, the keep-alive packet
is re-transmitted as many as KACNT times. After this count is reached, the relay
considers the remote device no longer available, so the relay can terminate the
connection without waiting for the idle timer (TIDLE or FTPIDLE) to expire.
The relay monitors MMS inactivity to identify and disconnect MMS clients that
have stopped communicating with it. You can set it from 0 to 42000000 seconds
via the IED Properties MMS Settings in
ACSELERATOR Architect SEL-5032
Software. The MMS Inactivity default value is either 120 seconds or 900 sec-
onds, depending on the relay. Setting this value to 0 disables the MMS Inactivity
timer. If enabled, the relay starts a timer for an MMS session after it receives an
MMS request from the client on that session. It resets the timer whenever it
receives a new MMS request from that client. When the timer runs out, the relay
disconnects the MMS session, making it available for other MMS clients.
This feature was implemented in addition to the TCP keep-alive timer to specifi-
cally handle MMS clients that do not disconnect properly. As there are a limited
number of MMS sessions available, this ensures that misbehaving MMS clients
do not take up multiple MMS sessions. Note that the MMS inactivity time-out
can still disconnect an MMS session even if the relay receives TCP keep-alive
messages from that MMS client.
The relay Ethernet card operates over either twisted-pair or fiber-optic media.
Each Ethernet card is equipped with two or four network ports. With an initial
ordering option, you can select the medium for each port (10/100 Mbps twisted-
pair or 100 Mbps fiber-optic). Speeds for the physical media are fixed for fiber-
optic connections. For twisted-pair connections, the Ethernet card can autodetect
the network speed or you can set a fixed speed.
Table 15.6 DEFRTR Address Setting Examples
IPADDR (CIDR)
SUBNET Mask
(Non-CIDR)
Network
Address
Broadcast
Address
DEFRTR
Range
a
a
DEFRTR cannot be the same as IPADDR, Network Address, or Broadcast Address.
192.168.1.2/28 255.255.255.240 192.168.1.0 192.168.1.15 192.168.1.0–
192.168.1.15
192.168.1.2/24 255.255.255.0 192.168.1.0 192.168.1.255 192.168.1.a
b
b
Value in the range 0–255.
192.168.1.2/20 255.255.240.0 192.168.0.0 192.168.15.255 192.168.0.a
b
–
192.168.15.a
b
192.168.1.2/16 255.255.0.0 192.168.0.0 192.168.255.255 192.168.a
b
.b
b
192.168.1.2/12 255.240.0.0 192.160.0.0 192.175.255.255 192.160.a
b
.b
b
–
192.175.a
b
.b
b
192.168.1.2/8 255.0.0.0 192.0.0.0 192.255.255.255 192.a
b
.b
b
.c
b
192.168.1.2/4 240.0.0.0 192.0.0.0 207.255.255.255 192.a
b
.b
b
.c
b
–
207.a
b
.b
b
.c
b
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