Automatic control function programming manual ladder language

6.33 Swap the Even and Odd Bytes of a Word swapw
Syntax
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swapw(&dest, &source, n)
&dest: Destination address.
&source: Source address.
n: Number of words to be copied.
Copies n words from &source into &dest, swapping the even and odd bytes of each word.
Example
swapw(%M20.&, %M120.&, 3)
%M120.W
%M122.W
%M124.W
Return code
If OK
Not significant.
Error
-1: n negative or zero
MSBs LSBs
MSBs
LSBs
Programming error causing a CPU fault
Access to a prohibited address:
- &dest parameter error,
- &source parameter error,
- &dest+n outside authorised area,
- &source+n outside authorised area.
%M20.W
%M22.W
%M24.W