Conversion of integer to boolean

[govind2k9]

Hi,

I need to decode the integer value to boolean and store the each bit of 16bits in different variable of boolean type and to be used in the program. I am using siemens Step 7 5.5. Is it possible to do this?

 

[boneless]

If you store the integer in an word, say MW0, you can access every individual bit by using M0.0 - M1.7.

Same goes for DB (DBW0 - DBX0.0-1.7)

 

[govind2k9]

Thank you very much. Much appreciated. It works as I needed.

 

[shooter]

use value AND 1
value AND 2
value AND 4
etc.

 

[boneless]

That would be the difficult way of doing it .

 

[govind2k9]

Hi all,
Thanks for reply. Now I would like to ask is there any way to do this in a multi instance FB. I receive integer variable in FB and save it in a local variable (Stat) in FB. I need to access the bits of the integer and to be used as NO or NC in the FB.
I tried this code and I am able to use individual bits of the integer but it works if there is only one FB not in multiinstance.

TAR1 #TempAR1
LAR1 P##VALVE_CONFIG_NO
L W [AR1,P#0.0]
T W [AR2,P#312.0] //Address pointer of the "Decoding_struct"
LAR1 #TempAR1

Please see attached picture to see how Decoding_struct is declared in FB.

 

[L D[AR2P#0.0]]

Here's an example implementation that uses a function that will move a word from a source to a destination using pointers.

To access variables indirectly in multiple instance FB's, you have to add AR2 to the pointer to the variable. The method I have shown uses the block editor to perform the addition "in the background".

 

[govind2k9]

Hi there,

Thank you very much for the code. It worked just fine. Sorry for being late as I was caught in offshore support and couldn't try this code in the weekend. I tried FC MoveWord in multiInstance FB and it's working with no issues.