Bitwise Boolean instructions
534
Part III FP Instructions
F218_DXNR
32-bit data XNR
Description
s1 s2 d
0 0 1
0 1 0
1 0 0
1 1 1
Using this instruction you can check how many bits in the two 32-bit data items are the same. At
each position in which the bits at inputs s1 and s2 match, a 1 is produced in the result.
This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which
is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the
"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears
under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming
area to open the list of recently used elements.
PLC types Availability of F218_DXNR (see page 1323)
Variable Data type Function
s1 32-bit equivalent constant or 32-bit area
s2 32-bit equivalent constant or 32-bit area
d
ANY32
32-bit area for storing XNR operation result
The variables s1, s2 and d have to be of the same data type.
For Relay T/C Register Constant
s1, s2 DWX DWY DWR DWL DSV DEV DDT DLD DFL dec. or hex.
d - DWY DWR DWL DSV DEV DDT DLD DFL -
No. IEC address Set If
R900B %MX0.900.11 for an instant the result calculated (output d) is 0.
The function performs a bit-wise exclusive NOR operation on two 32-bit data items at inputs s1 and
s2. The result of the function is returned at output d.
Truth
Table:
Data types
Operands
Error flags
Example
In this example, the same POU header is used for all programming languages. For an example
using IL (instruction list), please refer to the online help.
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