The IP address can be changed from a program by using the IP address change function.
The IP address change function can change the IP address, subnet mask, and default gateway IP address of the CPU module.

 

Procedure for changing the IP address
① The value to be changed is stored in SD8492 to SD8493.
② SM8492 (IP address storage area write request) is turned OFF to ON.
③ Check the write result with the special relay/register below.
 SM8493 (IP address storage area write complete)
 SM8494 (IP address storage area write error)
 SD8498 (IP address storage area write error code)
④ When writing is completed normally, the power of CPU module is reset from OFF to ON.

 

Please refer to the manual below for details.
MELSEC iQ-F FX5 User's Manual (Communication)