Setting up IP addresses - Arc protection - Auto synchronization - Bay control and measurement - Merging unit - Transformer protection - 2 winding - Feeder protection - Voltage regulation - Capacitor bank protection - Petersen Coil control - Grid automation - Busbar differential protection (high impedance) - Back-up protection - Motor protection - Busbar protection (voltage and frequency) - Transformer protection - 3 winding - Interconnection protection - Generator protection - Power management/Load shedding - Engineering Manual - REX640 Protection and control - PCL6 - IEC - ANSI

The IP address and the corresponding subnet mask can be set via LHMI for the Ethernet interface in the protection relay. Each Ethernet interface has a default factory IP address when the protection relay is delivered. The configured Ethernet interface IP address is preserved if the communication card is replaced.

Set the IP address for the protection relay's rear port and the corresponding subnet mask via the LHMI paths Configuration > Communication > Ethernet > Network1 address and Configuration > Communication > Ethernet > Network2 address.

Only the Network1 interface is enabled by default. See the cyber security deployment guideline for more information.

Table 1. Default IP addresses for the LAN port interfaces and the corresponding subnet masks
Interface	IP address	Subnet mask	Default mode
Network1	192.168.2.10	255.255.255.0	Enabled
Network2	192.168.3.10	255.255.255.0	Disabled

Note: When using redundant Ethernet (HSR or PRP), configure all devices in the network before connecting cables to ports LAN A and LAN B. Avoid using the LAN A or LAN B ports on redundant communication modules while changing the Switch mode parameter.