Hello folks,

Anyone has any idea if I can use AT within a structure?

Lets say I have the following structure:

Structvar : STRUCT
     DWordvar : DWORD;
     Boolvar : BOOL;
END_STRUCT;

I would want to split the DWordvar into an array of BYTE

BArrayvar AT Structvar.DWordvar: ARRAY[0..3] of BYTE;

Usually one would use something like the code above but it cannot be done.
Is there a simple way of doing this without having to shift the word and loading each byte into an array position?

Best Regards

Hello,

1) using SCL in Step7 classic

Here you see an example in STEP7 classic where a String is decomposed in its individual parts.
https://support.industry.siemens.com/cs/us/en/view/21947834

Or another example where a date and time is decomposed in bytes.
https://support.industry.siemens.com/cs/us/en/view/21950154

2) in TIA,
https://support.industry.siemens.com/cs/us/en/view/57132240

zone2097

Hello folks,

Anyone has any idea if I can use AT within a structure?

Lets say I have the following structure:

Structvar : STRUCT
     DWordvar : DWORD;
     Boolvar : BOOL;
END_STRUCT;

I would want to split the DWordvar into an array of BYTE

BArrayvar AT Structvar.DWordvar: ARRAY[0..3] of BYTE;

Usually one would use something like the code above but it cannot be done.
Is there a simple way of doing this without having to shift the word and loading each byte into an array position?

Best Regards

You cannot create an AT overlay inside a structure.

One solution would be to create another DWORD variable that has the overlay you need that you use as temporary.