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Type
| Function |
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Description
| Subtracts the duration (LTIME) connected to IN2 from the point in time (LTIME_OF_DAY) connected to IN1 and delivers a point in time (LTIME_OF_DAY) as result.
Note
This function is not extendable, no further inputs can be added. |
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Notes
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- When the subtraction result exceeds the permissible range of the output value, an overflow occurs.
- When the result of the calculation exceeds the permissible range of the LTIME_OF_DAY output value (00:00:00.0 to 23:59:59.999999999), a value less than 0 or greater or equal 24h is interpreted and displayed as time value in nanoseconds. There is no runtime error and no entry output in the MESSAGES window.Example in ST:out := SUB_LTOD_LTIME(LTOD#13:00:00 , LTIME#1d1h); (* results in LTOD#-43200000000000 ns *)
- The function provides implicit data type conversion at its input and output parameters according to the rules defined by the IEC 61131 standard.
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Parameters
| Inputs
 IN1
| Data type: | LTIME_OF_DAY |
| Description: | Point in time to subtract from. |
IN2
| Data type: | LTIME |
| Description: | Duration subtracted from IN1. |
Output
Out
| Data type: | LTIME_OF_DAY |
| Description: | Result point in time. |
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Error behavior
| Error behavior
The following table shows the errors which may occur while executing the function and the value returned by the function in the corresponding error case.
| Error case | Output value |
| Overflow | Overflow value |
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Additional information
| EN/ENO behavior
The POU is only executed if TRUE is applied to the EN input. If EN = FALSE, the POU is not executed and ENO = FALSE indicates the inactivity.
If any of the errors listed under "Error behavior" occurs while executing the function, ENO is set to FALSE.
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