S7-SCL single bit of one WORD

cagliostro · Jul 5, 2010

Hi all,

someone knows if is possible in SCL extract the single bit of a WORD or DOUBLE WORD defined as VAR_TEMP??

In other word I'd like to know how to realize in SCL the example in STL of the image attacched.

Thanks a lot

JesperMP · Jul 5, 2010

Something like this (not tested):
Not sure if you have to be careful of byteswapping.

Code:

Function extract_bit : VOID
VAR_OUTPUT
    bit_on : BOOL ;
END_VAR ;
 
VAR_TEMP
    test_word : WORD ;
    test_bit AT test_word : ARRAY[0..15] OF BOOL ;
END_VAR ;
 
test_word := W#16#00FF ;
bit_ON := test_bit[0] ;
 
END_FUNCTION ;

cagliostro · Jul 5, 2010

Thanks a lot Jesper for your post.

I confirmed you that the byte are swapping, but it's no problem I used the ROL and ROR instruction to bring as before all.

S7-SCL single bit of one WORD

cagliostro

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JesperMP

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cagliostro

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