15.12
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
Ethernet Communications
Network Connection Using PRP Connection Mode
Parallel Redundancy Protocol (PRP) is part of an IEC standard for high availabil-
ity automation networks (IEC 62439-3). The purpose of the protocol is to provide
seamless recovery from any single Ethernet network failure.
The basic concept is that the Ethernet network and all traffic are fully duplicated
with the two copies operating in parallel.
NOTE: PTP cannot be used in
combination with PRP.
Make the following settings in Port 5 to configure the relay for PRP mode.
➤ NETMODE := PRP
➤ PRPTOUT := desired time-out for PRP frame entry
➤ PRPADDR := PRP destination MAC address LSB 01-15-4E-00-01-XX
➤ PRPINTV := desired supervision frame transmit interval
When NETMODE is not set to PRP, the PRP settings are hidden.
When PRP is enabled, SEL recommends reducing the maximum number of
incoming GOOSE subscriptions to 64. Incoming GOOSE buffers are sized to
accommodate a maximum of 128 GOOSE messages. The number of messages
doubles when PRP is enabled.
Ethernet Protocols
NOTE: The relay prioritizes
processing IEC 61850 GOOSE data
over the data access protocols listed
above. With GOOSE enabled, high
GOOSE traffic to and from the relay
sustained over long periods may
cause slowed responsiveness to data
transfer requests via TCP/IP protocols.
Access data using either the standard TCP/IP Telnet and FTP interfaces or,
optionally, through the (Web) HTTP Server, DNP3 LAN/WAN or IEC 61850
interface. You cannot access all data through all interfaces. See the appropriate
interface section below for details on data access.
FTP
FTP is a standard application-level protocol for exchanging files between com-
puters over a TCP/IP network. The relay Ethernet card operates as an FTP server,
presenting files to FTP clients. The relay Ethernet card supports one FTP connec-
tion at a time. Subsequent requests to establish FTP sessions will be denied. If
your FTP client does not work properly, be sure to set your client to use a single
session.
Table 15.7 lists the settings that affect FTP server operation.
NOTE: SEL advises against enabling
anonymous FTP logins (FTPANMS = Y)
except under test conditions. The
Ethernet card does not require a
password for the special FTP user
name “anonymous”. If you enable
anonymous FTP logins, you are
allowing unrestricted access to the
relay and host files.
Table 15.7 FTP Settings
Label Description Range Default
FTPSERV
a
a
If you change these settings and accept the new settings, the Ethernet card closes all active
network connections and briefly pauses network operation.
FTP session enable Y, N N
FTPCBAN FTP connect banner 254 characters FTP SERVER:
FTPIDLE
a
FTP connection time-out 5–255 minutes 5
FTPANMS
a
Anonymous login enable Y, N N
FTPAUSR User level from which anonymous
FTP client inherits access rights
0, 1, B, P, A, O, 2 0
To Next Page
Loading...
