F21_DADD

Redundant instruction

NOTE

This is a redundant instruction. It is replaced by: ADD

The 32-bit equivalent constant or 32-bit area specified by s and the 32-bit data specified by d are added together if the trigger EN is in the ON-state. The result is stored in d. All 32-bit values are treated as double integer values.

Parameters

Input

s (DWORD, DINT, UDINT, DATE, TOD, DT): Addend

Output

d (DWORD, DINT, UDINT, DATE, TOD, DT): Augend and result

Example

(1) Example value 1312896
(2) Example value 558144
(3) Result value 1871040 if trigger is ON
(4) 32-bit area

Remarks

If the required data type is supported, we recommend using the IEC instruction ADD.
When this instruction is used, the area for the augend d is overwritten by the added result. If you want to avoid the overwrite, we recommend using the instruction F23_DADD2.
The variables s and d have to be of the same data type.

Error flags

sys_bIsEqual (turns to TRUE for one scan): if the calculated result is 0.
sys_bIsCarry (turns to TRUE for one scan): if the result exceeds the range of 32-bit data (overflow or underflow).