7.5
Date Code 20170814
Instruction Manual
SEL-700G Relay
Communications
Communications Interfaces
primary link returns to normal before the failover time expires, the failover
timer resets and uninterrupted operation continues on the primary network
port.
Setting FTIME = OFF allows fast port switching (with no intentional delay).
Fast port switching can occur within one processing interval (typically 4 ms to
5 ms) and can help with IEC 61850 GOOSE performance.
After failover, while communicating via the standby port, the SEL-700G
checks the primary link periodically and continues checking until it detects a
normal link status. The relay continues to communicate via the standby port
even after the primary port returns to normal. The relay reevaluates the port of
choice for communication upon a change of settings, a failure of the standby
port, or a reboot. The relay returns to operation on the primary link under
those conditions if it detects a normal link status. When the active and backup
links both fail, the relay alternately checks the link status of the primary and
standby ports.
Unmanaged Switch Mode
If you have a network configuration where you want to use the relay as an
unmanaged switch, set NETMODE to SWITCHED. In this mode, both links
are enabled. The relay responds to the messages it receives on either port. The
relay transmits out of the other port, without modification, all messages a
network port receives that are not addressed to the relay. In this mode, the
relay ignores the NETPORT setting.
Fixed Connection Mode
If you have a single network and want to use only one network port, or if you
have both ports connected but want to force usage of only one port for various
reasons, set NETMODE to FIXED and set NETPORT to the port you want to
use. Only the selected network port operates, and the other port is disabled.
Autonegotiation, Speed, and Duplex Mode
Single or dual copper Ethernet ports autonegotiate to determine the link speed
and duplex mode. Accomplish this by setting the NETASPD and NETBSPD
(network speed) to AUTO. You can apply single or dual copper ports in
networks with older switch devices by setting these ports to specific speeds.
However, the relay ignores speed setting for fiber Ethernet ports. The relay
hardware fixes the single and dual fiber Ethernet ports to work at 100 Mbps
and full duplex mode.
NETPORT Selection
The NETPORT setting gives you the option to select the primary port of
communication in failover or fixed communications modes.
IRIG-B
The SEL-700G has three different physical interfaces, depending on the
model options, to provide demodulated IRIG-B time-code input for time
synchronization. If the relay has multiple options for IRIG-B input, you can
use only one input at a time. Connection diagrams for IRIG-B and settings
selection are in Figure 7.4 through Figure 7.8 in this section.
Option 1: Terminals B01 and B02
This input is available on all models except models with dual Ethernet Port or
Fiber-Optic Ethernet port. Refer to Figure 7.4 for a connection diagram.
Summary of Contents for SEL-700G Series
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