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Date and time instructions
SUB_DATE_DATE
SUB_DATE_DATE subtracts a value of the data type DATE from another DATE value. The result
Description
is stored in the output variable of the data type TIME.
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
Availability of SUB_DATE_DATE (see page 1331)
PLC types
The TIME result is only valid if the difference between the minuend and
subtrahend is smaller than or equal to the maximum TIME duration allowed.
Otherwise an overflow of the TIME result variable occurs and the CARRY flag is
set.
Data types
Data type
DATE
DATE
TIME
In this example the function has been programmed in ladder diagram (LD) and structured text (ST).
Example
POU header
All input and output variables used for programming this function have been declared in the POU
header.
LD
ST
When programming with structured text, enter the following:
TIME_result
300
Subtracts a date from another date
I/O
Function
1st input
minuend
2nd input
subtrahend
output
result
:= SUB_DATE_DATE(DATE_value1, DATE_value2);
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