Omron NS Reference Manual page 55

Section2 Functions
NS series Macro Reference
SWAP
Swaps high order and low order of the specified address
Applicable versions
Format
Function
Return Value
Example
System version 4 or higher
SWAP(S,n)
Swap high order (1 byte) and low order (1 byte) of the word data or the internal
holding word which was taken n word form S.
S: Top address ($W or $HW) to be swapped. (See note.)
n: The number of words to be taken from S.
Setting range is as follows:
When specifying "n" directly: 1 to 32767
When specifying "n" indirectly: $W0 to $W32767
Note: Index can be set when using address to specify for S. Setting range is for $W
is between 0 and 32767 and for $HW is between 0 to 8191.
None
SWAP($W100,3);
Swap high order and low order of the word data which was taken from 3 words from
$W100.
<Before performing SWAP>
Swap high order and low order
1 2
$W 100
5 6
$W 101
$W 102
9 0
.
.
.
$HW0 to $HW8191
3 4
7 8
1 2
35
<After performing SWAP>
3 4
$W 100
7 8
$W 101
$W 102
1 2
.
.
.
1 2
5 6
9 0