15.11
Date Code 20171006
Instruction Manual
SEL-400 Series Relays
Communications Interfaces
Ethernet Communications
FL2 Relay Word bit. Note that for very small values of FTIME, or for a failover
event on the process bus, the assertion or deassertion of LNKFAIL and LNKFL2
can be too short for a state change to register in the SER.
Network Connection Using Isolated IP Connection Mode
The Isolated IP mode (NETMODE = ISOLATEIP) permits IEC 61850 GOOSE
messages on two ports, but restricts IP traffic to just one port. This mode is useful
for cases where it is desired to connect one port to a secured network (the IP port)
but have the other port leave the security perimeter.
NOTE:
If NETMODE = ISOLATEIP,
Precision Time Protocol (PTP) is only
supported on the port designated as
the IP port.
The NETPORT setting selects which port will be the IP port. The other port will
only support GOOSE traffic. IP transmissions will only go out the IP port. IP
receptions will only be processed from the IP port. GOOSE publications will go
out both ports. GOOSE subscriptions will be accepted from either port. Any non-
GOOSE traffic received on the non-IP port will be ignored. No traffic will go
from one external port to the other.
Redundant Ethernet Network Using SWITCHED Mode
Make
Port 5
setting NETMODE = SWITCHED to activate the internal Ethernet
switch. The internal switch connects a single Ethernet stack inside the relay to
two external Ethernet ports. The combination of relay and internal switch operate
the same as if a single Ethernet port on a relay were connected to an external
unmanaged Ethernet switch. Use the internal switch to add devices to a network,
as shown in
Using this topology, the internal network switch of the relay supports connecting
Ethernet devices in series. This configuration is only recommended for tempo-
rary use.
When using this switched mode, take care not to connect the last device back to
the Managed Ethernet Switch, thereby creating a loop or ring.
In switched mode, the internal Ethernet switch of the relay is an unmanaged
Ethernet switch and does not provide RSTP functionality. You will experience
very large RSTP healing times in such a network.
Network Connection Using Fixed Connection Mode
Force the relay to use a single Ethernet port even when it is equipped with two or
more Ethernet ports by making setting NETMODE := FIXED. When
NETMODE := FIXED, only the interface selected by NETPORT is active. The
other interfaces are disabled.
Figure 15.6
Using Internal Ethernet Switch to Add Networked Devices
Relay
Network
Managed
Ethernet
Switch
Relay
Relay
Relay
Relay
Содержание SEL-421-4
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