primary and secondary IP address's needs to configure in vijeo????
You wont care what's going on in the Standby PLC, when the CPU's swap over the HMI will drop comms for a second or two, then come back up
If what you want to do is have a redundant connection to the same PLC then that's as below:
Setting Up the Modbus Dual Ethernet Connection
Set up the Modbus TCP/IP device driver. For more information, see Section 5.2.1, Adding a Device Driver.
Configure the communication settings for the driver in the Driver Configuration dialog box. For more information, see Section 5.2.2, Configuring Communication Settings.
Configure the communication settings for the equipment in the Equipment Configuration dialog box. For more information on the Modbus TCP/IP equipment properties, see Section 26.3.6, Changing I/O Manager Communication Settings: Schneider Electric. For the Modbus TCP/IP device driver, you must define the following settings to set up the Modbus dual Ethernet connection:
IP Address – Enter the primary IP address.
Secondary Connection – For a PLC with two Ethernet ports, enable this check box to allow a secondary IP address to be entered.
Backup IP – Enter the secondary IP address.