Call physical address by variable

2020-06-29T14:05:33.383000Z

This code work for several %IB (example %IB0 to %IB10) to position0 in 1 instruction if I set index to 10 ?

Call physical address by variable

2020-06-29T12:06:37.867000Z

PROGRAM PLC_PRG
VAR
    value : BYTE;
    position0 : POINTER TO BYTE;
    index : BYTE;
END_VAR
position0 := ADR(%IB0);
value  := position0[index];

Call physical address by variable

2020-06-29T08:43:53.137000Z

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.

Call physical address by variable

2020-06-16T10:41:39.871000Z

That is the standard/normal/vanilla way of coupling IO...

In general there are 2 vanilla flavours (there are way more options but those aren't exactly vanilla anymore);
Declare variables in your IO point and reference that variable in your POU (program, FB, Func, whatever)
Declare variables in your POU and couple them to an IO point.

PS: I never use hardcoded IO adresses in my code (%I, %Q, %M etc) .

Call physical address by variable

2020-06-16T10:00:14.070000Z

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

Call physical address by variable

2020-06-16T09:59:52.521000Z

I think it's not I want to do....

Call physical address by variable

2020-06-16T07:36:27.855000Z

wIndex doesn't work. For pValue := %IW8 : when wIndex = 0 I have the good result of %IW8 but if I put wIndex:=1; I haven't got value of %IW9. Result is 0.

Call physical address by variable

2020-06-15T18:56:31.652000Z

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

Call physical address by variable

2020-06-15T16:31:26.252000Z

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);

Call physical address by variable

2020-06-14T09:39:01.413000Z

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;

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