Hitachi Relion 670 Series Applications Manual page 364

Section 17
Ethernet-based communication
The default gateway can be selected by entering the IP address in Default gateway. The default
gateway is the router that is used to communicate with the devices in the other subnetwork. By
default this is set to 0.0.0.0 which means that no default gateway is selected. ECT validates the
entered value, but the default gateway has to be in the same subnetwork as the access point. The
default gateway is the router that is being used as default, that is when no route has been set up for
the destination. If communication with a device in another subnetwork is needed, a route has to be
set up. For more information on routes, see the Routes chapter in the Technical manual and the
Application manual.
DHCP can be activated for the front port from the LHMI in Main menu/Configuration /
Communication/Ethernet configuration /Front port/DHCP:1
17.1.2.1 Setting IP address, Subnet mask and Default gateway of Access Points
from LHMI
To set the access point parameters navigate to Configuration/Communication /Ethernet
configuration.
Subnetting Rules
To correctly configure access points' parameters such as IP address, Subnet mask, and Default
gateway address. Subnetting rules should be considered. Subnetting puts a limit on the range of IP
addresses that can be assigned to the devices (hosts) in a given subnetwork. This limit is decided by
the subnet mask.
Subnetwork of any access point is decided by the combination of the assigned IP address and
subnet mask. For all configured AP's in the IED, there should not be any duplication of subnet. This
means each access point should be configured in a separate subnet. Please note that in LHMI,
subnetting rules are checked on enabled access points only.
If the user sets an IP address and Subnet mask that violates subnetting rules, then the following pop-
up will be shown before the user tries to save the changes.
GUID-CEE770E3-3664-4243-9CAE-E0CEB19AFE9B V1 EN-US
Figure 176:
User Options
358
To increase security it is recommended to uncheck protocols that are not used on the
access point.
Additional checks are added while setting the Access Point configuration from LHMI to
prevent the user from wrongly configuring the parameters.
Error
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1MRK506375-UEN Rev. N
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Railway application RER670
Application manual