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Date and time instructions
SUB_DT_TIME
SUB_DT_TIME subtracts a value of the data type TIME from a value of the data type
Description
DATE_AND_TIME. The result is stored in the output variable of the data type TIME_OF_DAY.
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.
PLC types
Availability of SUB_DT_TIME (see page 1331)
Data types
Data type
DATE_AND_TIME
TIME
DATE_AND_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:
DT_result
302
Subtracts time from date and time
I/O
1st input
2nd input
output
:= SUB_DT_TIME(DT_value, TIME_value);
Function
minuend
subtrahend
result
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