GE L90 Instruction Manual page 154

5.2 PRODUCT SETUP
 NETWORK PORT 3

These messages appear with the Ethernet card present.
The
PRT1 (2, 3) GOOSE ENABLED
determines if ports 2 and 3 operate in redundant or independent mode. In non-redundant mode, port 2
PRT2 REDUNDANCY
and 3 operate independently with their own MAC and IP address. In redundant mode, port 2 and 3 use the port 2 MAC and
IP address, port 3 is in standby mode and monitors its link to the Multilink switch, and when port 2 detects a problem with
the link then communication switches to port 3 until the link returns.
The IP addresses are used with the DNP, Modbus/TCP, IEC 61580, IEC 60870-5-104, TFTP, and HTTP protocols. The
NSAP address is used with the IEC 61850 protocol over the OSI (CLNP/TP4) stack only. Each network protocol has a set-
ting for the TCP/UDP port number. These settings are used only in advanced network configurations and should normally
be left at their default values, but may be changed if required (for example, to allow access to multiple UR-series relays
behind a router). By setting a different
map the relays to the same external IP address. The client software (EnerVista UR Setup, for example) must be configured
5
to use the correct port number if these settings are used.
When the NSAP address, any TCP/UDP port number, or any user map setting (when used with DNP) is changed, it
will not become active until power to the relay has been cycled (off-on).
NOTE
Do not set more than one protocol to the same TCP/UDP Port Number, as this results in unreliable operation of
those protocols.
NOTE
e) MODBUS PROTOCOL

PATH: SETTINGS PRODUCT SETUP
 MODBUS PROTOCOL

The serial communication ports utilize the Modbus protocol, unless configured for DNP or IEC 60870-5-104 operation (see
descriptions below). This allows the EnerVista UR Setup software to be used. The UR operates as a Modbus slave device
only. When using Modbus protocol on the RS232 port, the L90 responds regardless of the
grammed. For the RS485 port, each L90 must have a unique address from 1 to 254. Address 0 is the broadcast address
which all Modbus slave devices listen to. Addresses do not have to be sequential, but no two devices can have the same
address or conflicts resulting in errors will occur. Generally, each device added to the link should use the next higher
address starting at 1. See Appendix B for more information on the Modbus protocol.
A value of 0 closes the port. When the Modbus port is set to 0, communicate with the relay using the front panel or serial
port.
When a 0 value is involved in a change, the changes to the MODBUS TCP PORT NUMBER setting take effect
when the L90 is restarted.
NOTE
5-24
PRT3 IP ADDRESS:
0.0.0.0
PRT3 SUBNET IP MASK:
MESSAGE
0.0.0.0
PRT3 GWY IP ADDRESS:
MESSAGE
0.0.0.0
PRT3 GOOSE ENABLED:
MESSAGE
Enabled
setting provides the ability to disable/enable GOOSE transmission from the port.
TCP/UDP PORT NUMBER

COMMUNICATIONS
MODBUS SLAVE
ADDRESS: 254
MODBUS TCP PORT
MESSAGE
NUMBER:
L90 Line Current Differential System
Range: Standard IPV4 address format
Range: Standard IPV4 address format
Range: Standard IPV4 address format
Range: Enabled, Disabled
for a given protocol on each UR-series relay, the router can

MODBUS PROTOCOL
Range: 0 to 254 in steps of 1
Range: 0 to 65535 in steps of 1
502
5 SETTINGS
pro-
MODBUS SLAVE ADDRESS
GE Multilin