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Date and time instructions
SUB_TOD_TOD
SUB_TOD_TOD subtracts a value of the data type TIME_OF_DAY from another TIME_OF_DAY
Description
value. The result 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_TOD_TOD (see page 1331)
PLC types
Data types
Data type
TIME_OF_DAY
TIME_OF_DAY
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
304
Subtract Time of Day from Time of Day
I/O
Function
1st input
minuend
2nd input
subtrahend
output
result
:= SUB_TOD_TOD(TOD_value1, TOD_value2);
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