F61_DCMP

Redundant instruction

NOTE

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

Compares the 32-bit data or 32-bit equivalent constant specified by s1 with one specified by s2 if the trigger EN is in the ON-state. The compare operation result is stored in the system variables sys_bIsGreaterThan (> flag), sys_bIsEqual (= flag), sys_bIsLessThan (< flag) and sys_bIsCarry (carry-flag).

Parameters

Input

s1, s2 (DWORD, DINT, UDINT, DATE, TOD, DT): 32-bit equivalent constant or 32-bit area

Remarks

If the required data type is supported, we recommend using the IEC instruction of the comparison instructions.
The variables s1 and s2 have to be of the same data type.

Data	Comparison between s1 and s2	Flags
Data	Comparison between s1 and s2	`sys_bIsGreaterThan` (>flag)	`sys_bIsEqual` (=flag)	`sys_bIsLessThan` (<flag)	`sys_bIsCarry` (carry-flag)
32-bit data with sign	s1<s2	Off	Off	On	#
	s1=s2	Off	On	Off	Off
	s1>s2	On	Off	Off	#
32-bit data without sign	s1<s2	#	Off	#	On
	s1=s2	Off	On	Off	Off
	s1>s2	#	Off	#	Off

# turns ON or OFF depending on the conditions