15.6
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
Ethernet Communications
➤ If the PARITY setting is E, the transmitter asserts or deasserts the
parity bit so that the number of asserted data bits plus the parity bit is
an even number. If the PARITY setting is O, the transmitter asserts or
deasserts the parity bit so that the number of asserted data bits plus
the parity bit is an odd number. If the PARITY setting is N, the data
frame does not include a parity bit.
➤ At the completion of the data bits and parity bit (if any), the
transmitter deasserts the line for one bit time (stop bit). If STOPBIT
is set to 2, the transmitter deasserts the line for one more bit time
(stop bit).
➤ Until the relay transmits another character, the TXD pin will remain
in the unasserted state.
Ethernet Communications
Ethernet Card
SEL-400 series relays support an optional Ethernet Card. In some SEL-400 series
devices, this is a daughter card to the mainboard. In others, it goes into Bay 3.
You can either field install the optional communications card or order the relay
with the card installed at the factory. As with other SEL products, SEL has
designed and tested SEL Ethernet cards for operation in harsh environments.
The optional Ethernet card provides Ethernet communications for the relay. The
Ethernet card is available with standard twisted-pair and fiber-optic physical
interfaces. The Ethernet card includes redundant physical interfaces with the
capability to automatically transfer communications to the backup interface in
the event that the primary network fails. For information on substation integration
architectures, see Section 16: DNP3 Communication and Section 17: IEC 61850
Communication.
Once installed in a relay, the settings needed for network operation and data
exchange protocols, including DNP3 and IEC 61850, are available in the PORT 5
settings.
Ethernet Network Operation
You should carefully design your Ethernet network to maximize reliability, mini-
mize system administration effort, and provide adequate security. SEL recom-
mends that you work with a networking professional to design your substation
Ethernet network.
Several settings control how the relay with the optional Ethernet card operates on
an Ethernet network. These settings include IP addressing information, network
port failover options, and network speed.
NOTE: Only some SEL-400 series
relays are available with four Ethernet
ports.
Use the network configuration settings shown in Table 15.4 to configure the relay
for operation on an IP network and to set other parameters affecting the physical
Ethernet network interface operation. The relay is equipped with either two or
four Ethernet ports: A, B, C, and D. Ports A and B support PTP protocol, ports C
and D do not. If the relay has two ports without the PTP option, they will support
standard Ethernet, DNP3, and optional IEC 61850 communications. If the relay
has four ports, the additional two ports can be used for relay-specific functions.
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