Data transfer within the PLC
836
Part III FP Instructions
F15_XCH
16-bit data exchange
15 . . 12
11
. . 8 7 . . 4 . 0 3 .
d1
0 0 0 1
d2
1 0 0 0
0 00000000001
0
00000000001
Bit
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 F15_XCH (see page 1321)
Variable Data type Function
d1 16-bit area to be exchanged with d2
d2
ANY16
16-bit area to be exchanged with d1
The variables d1 and d2 have to be of the same data type.
For Relay T/C Register Constant
d1, d2 - WY WR WL SV EV DT LD FL -
Description
The contents in the 16-bit areas specified by d1 and d2 are exchanged if the trigger EN is in the
ON-state.
Data types
Operands
Example
In this example the function has been programmed in ladder diagram (LD) and structured text
(ST).The same POU header is used for all programming languages.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
Body
When the variable start is set to TRUE, the function is carried out.
LD
ST
When programming with structured text, enter the following:
IF start THEN
F15_XCH(value_1, value_2);
END_IF;
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