F38_DDEC

Subtracts "1" to the 32-bit data specified by d if the trigger EN is in the ON-state. The result is stored in d.

Parameters

Output

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

32-bit area to be decreased by 1

Remarks

Instead of using this F instruction, we recommend using the corresponding FP7 instruction: FP_DECFP_DEC

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 (underflow).