There is any solution to cal physical , example: %IW1
like this:

i:=1;

MyVariable:=%IWi;

Thanks for your answers.
Bests regards.

Is it possible to make POINTER move X byte from %IW1 to a numbrer of byte ?

I want to put all data receive by ethernet IP in data by code, I don't want to use graphic interface.

Are you asking to do something like:

VAR
    iValue: INT := 511; //Value to be split or you could do wValue AT %IW1: WORD;
    pValue: POINTER TO BYTE; //Address of iValue
    byValue1: BYTE; //LSB for iValue
    byValue2: BYTE; //MSB for iValue
END_VAR

//Set pointer
    pValue := ADR(iValue);

//Get LSB byte in int value
    byValue1 := pValue^; //Value would be 255

//Increment to next byte in int value
    pValue := pValue + 1;

//Get MSB byte in int value
    byValue2 := pValue^; //Value would be 1

There are a lot of ways to approach this so it would help if you showed an example using sudo code to help show what you are trying to accomplish. You could also use a UNION to split values up into smaller data types.

iValue: INT := 511; //Value to be split or you could do wValue AT %IW1: WORD;

I want to define on input of FB the address %IW1. Is it possible ? And after, by code incremente adress to %IW2, %IW3, etc...

The idea is create a function block with input the first address of %IW and the first address of %QW:

FB for Slave ethernet ip 1:
First_Input := %IW1;
First_Input[1]:= DATA[1].word_1;
First_Input[2]:= DATA[1].word_2;
First_Input[3]:= DATA[1].word_3;
....

FB for Slave ethernet ip 2:
First_Input := %IW10;
First_Input[1]:= DATA[2].word_1;
First_Input[2]:= DATA[2].word_2;
First_Input[3]:= DATA[2].word_3;
....

FB for Slave ethernet ip 10:
First_Input := %IW100;
First_Input[1]:= DATA[2].word_1;
First_Input[2]:= DATA[2].word_2;
First_Input[3]:= DATA[2].word_3;

This should be enough to get you started and you can build off of this.

******************************************************
FUNCTION MyFunction : WORD
VAR_INPUT
    pValue : POINTER TO WORD; //Pointer to start address. In your case it would be %IW0
    wIndex : WORD; //Index above start address to go to. 0 = %IW0, 1 = %IW1, 2 = %IW2.....
END_VAR
pValue := pValue + (wIndex * SIZEOF(WORD)); //Set pointer to desired index
MyFunction := pValue^; //Get value from pointer and return
******************************************************
//Then call it like:
PROGRAM PLC_PRG
VAR
    wIndex : WORD; //Index value to get. 0 = %IW0, 1 = %IW1, 2 = %IW2.....
    wReturnValue : WORD; //result from function call for test
END_VAR
wReturnValue := MyFunction(pValue:= ADR(%IW0), wIndex:= wIndex);

Maybe you should check out this store example: https://store.codesys.com/io-mapping-tool.html

It enables you to graphically map IO to an FB 'on the fly' or do it programmatically.
Plus this example is open-source, so if you want to know how it works or modify it for your own needs you can do that.

Good luck

What do you think about this: https://help.codesys.com/api-content/2/codesys/3.5.13.0/en/_cds_configuring_devices_mapping_ios/#mapping-a-device-input-to-a-function-block-instance

Is it possible to create my own ethernet ip device ? I have x same device, I/O are mapped on table, just number of ligne change. Could I create my special device with special parameter which defines number of line in the table, I could win a lot of time.