F28_DSUB2

Redundant instruction

NOTE

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

Subtracts the 32-bit data or 32-bit equivalent constant specified by s2 from the 32-bit data or 32-bit equivalent constant specified by s1 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

s1 (DWORD, DINT, UDINT, DATE, TOD, DT): Minuend
s2 (DWORD, DINT, UDINT, DATE, TOD, DT): Subtrahend

Output

d (DWORD, DINT, UDINT, DATE, TOD, DT): Result

Example

(1) Example value16809984
(2) Example value 525312
(3) Result value 16284672 if trigger is ON
(4) 32-bit area

Remarks

If the required data type is supported, we recommend using the IEC instruction SUB.
The variables s1, s2 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).