Ethernet Ports - GE D90 Plus Instruction Manual

CHAPTER 6: COMMUNICATIONS

Ethernet ports

NOTE:
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
The Ethernet ports can be configured for single IP, dual IP, or redundancy using the Parallel
Redundancy Protocol (PRP).
The single IP redundancy configuration provides compatibility with UR-series relays and
other devices with single-IP redundancy. In this configuration, the port 2 IP address, subnet
mask, and gateway address are used and the port 3 settings are ignored. All
communications traffic is normally routed on port 2. If a failure occurs (determined at the
hardware layer upon detecting loss of link signal on the active channel), then the traffic is
re-routed to port 3. Switchover to port 3 takes place in less than 10 ms from the moment
that the physical layer detects a failure. The device reverts from port 3 to port 2 as soon as
port 2 becomes available, regardless of the state of port 3. Switchover to port 2 takes place
in less than 500 ms. A link pulse is maintained in the transmit direction on both ports
regardless of which port is in use. This ensures that communications are established with
minimal delays. An Ethernet broadcast message is transmitted immediately upon
switching ports, thereby forcing all Ethernet switches in the network to immediately
update their routing tables.
In the dual IP redundancy configuration, each port has a unique IP address, subnet mask,
and gateway address. Multiple client-server connections can be opened on each port
simultaneously. Under normal conditions, GOOSE messages are sent on both ports.
If the PRP option was purchased, the D90
2012). PRP provides seamless recovery in case of a single failure in the network, by using a
combination of local area network (LAN) duplication and frame duplication. Identical
frames are sent on two independent networks that connect source and destination. Under
normal circumstances, both frames reach the destination and one of them is used while
the second frame is discarded. If an error occurs in one of the networks and traffic is
prevented from flowing on that path, connectivity is still provided over the other network.
When designing the two LANS, take care that no single point of failure (such as a common
power supply) is encountered, because it can bring down both LANs simultaneously.
Similar to single and dual-IP configuration, ports 2 and 3 are used on the
Plus
D90 communications card for PRP. The following figure shows an example of a PRP
redundant network.
Figure 76: Sample PRP redundant network
To configure the Ethernet ports, select the Settings > Communications > Network >
Ethernet menu to open the Ethernet configuration window. A selection of settings,
commands, and actual values is available. Options visible depend on whether PRP was
Plus
purchased with the D90
The IP addresses are used with the DNP, Modbus/TCP, IEC 61580, IEC 60870-5-104, TFTP,
and PRP protocols.
When the network service access point (NSAP) address or any user map setting (when
used with DNP) is changed, it becomes active when power to the relay has been cycled
(off-to-on).
Plus
supports PRP as per IEC 62439-3 (Clause 4,
.
NETWORK SETTINGS
95