Hi to all,

the following code give me the following error "access requires a literal or an integer symbolic constant"

   PROGRAM PLC_PRG
   
   VAR
      my_word      :DWORD;
      scan_bit      :INT;
      test         :BOOL;
   END_VAR

   FOR scan_bit:=0 TO 24 BY 1 DO
   
      IF(my_word.my_word) THEN
         test := TRUE;
      ELSE
         test := FALSE;
      END_IF      
   END_FOR      
         

Is there a solution to do it?

Thank you for help
Luca

I'm sory, I don't understand this : "IF(my_word.my_word)..."

I think you wanted to write "IF(my_word. scan_bit)..."

To my knowledge you can't use a variable to acces a bit of a word (it is the same with SINT, INT, DINT, USINT, UDINT, BYTE, WORD, DWORD)

To acces to a bit of a word you can only use :
- a value, for example you can test (or write ) "my_word.2" or "my_word.5" ...

• a Global Constant
  VAR_GLOBAL CONSTANT
  Indice:INT:=2;
  END_VAR

And you can test (or write ) "my_word.Indice"

One solution to test each bit of a word may be to use SHL/SHR operators to shift and test each bit.
You can see CODESYS HELP : https://help.codesys.com/webapp/_cds_op ... n=3.5.15.0

BR

Originally created by: D. Kugler

https://help.codesys.com/webapp/extract ... n=3.5.11.0
That's what you are searching for?

This could provide a nice access :see this post

JAPIB hat geschrieben:
I'm sory, I don't understand this : "IF(my_word.my_word)..."
I think you wanted to write "IF(my_word. scan_bit)..."
To my knowledge you can't use a variable to acces a bit of a word (it is the same with SINT, INT, DINT, USINT, UDINT, BYTE, WORD, DWORD)

To acces to a bit of a word you can only use :
- a value, for example you can test (or write ) "my_word.2" or "my_word.5" ...
- a Global Constant
VAR_GLOBAL CONSTANT
Indice:INT:=2;
END_VAR
And you can test (or write ) "my_word.Indice"

One solution to test each bit of a word may be to use SHL/SHR operators to shift and test each bit.
You can see CODESYS HELP : https://help.codesys.com/webapp/_cds_op ... n=3.5.15.0
BR

Sorry for my error, yes You have right should be ```

IF(my_word. scan_bit)

```
Thank you for help

D. Kugler hat geschrieben:
https://help.codesys.com/webapp/extract;product=codesys;version=3.5.11.0
That's what you are searching for?

Absolulty Yes! Thank you very much!