| Function Name |
SUB_DT_DT |
|---|---|
|
Description |
Subtracts a date time input from another date time input to provide a time output. (It outputs the time difference between the two input dates and times). |
|
Arguments |
Input 1 {DATE_AND_TIME} Input 2 {DATE_AND_TIME} For more information on the data types for the inputs and outputs, see Data Type Hierarchy. |
|
Returns |
Output {TIME} The Output is the result of Input 1 - Input 2 |
Example:
Function Block Diagram - SUB_DT_DT:
A SUB_DT_DT function has 2 inputs (in this case, a NOW function and a constant):
- Input 1 is connected to a NOW function
- Input 2 is set to DT#2002-03-11-10:00:25.431.
The SUB_DATE_DATE function returns a time value that is the result of the current date and time - 2002-03-11-10:00:25.431.
ST Program - SUB_DT_DT:
The syntax for a SUB_DT_DT function in an ST Program is:
- Output := SUB_DT_DT (Input 1, Input 2)
Where Output, Input 1 and Input 2 are defined as variables earlier in the ST program. Input 1 and Input 2 are date and time values and the Output is a time value.