F20_ADD

Redundant instruction

NOTE

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

The 16-bit equivalent constant or 16-bit area specified by s and the 16-bit area specified by d are added together if the trigger EN is in the ON-state. The result is stored in d. All 16-bit values are treated as integer values.

Parameters

Input

s (WORD, INT, UINT): Addend

Output

d (WORD, INT, UINT): Augend and result

Example

(1) Example value 27
(2) Example value 16
(3) Result value 43 if trigger is ON

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 F22_ADD2.
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 16-bit data (overflow or underflow).