6.1.3.6.2 CMP

Function

Compare IN and VAL and output the result at OUT

LD Graphics

Parameter description

Interface variable	Declaration	Data type	Description
ON	Var_Input	BOOL	Function input
IN	Var_Input	ANY_ELEMENTARY	Comparison value 1
VAL	Var_Input	ANY_ELEMENTARY	Comparison value 2
Return value	Function value	BOOL	Result output

warning

• Function function can be changed by clicking on the equal sign (=) position in the graph:
  • Equal to: When the ON input is 1, if IN is equal to VAL, then OUT outputs 1; otherwise, it outputs 0
  • Greater than or equal to: When the ON input is 1, if IN is greater than or equal to VAL, then OUT outputs 1; otherwise, it outputs 0
  • Greater than: When the ON input is 1, if IN is greater than VAL, OUT outputs 1; otherwise, it outputs 0
  • Less than or equal to: When the ON input is 1, if IN is less than or equal to VAL, then OUT outputs 1; otherwise, it outputs 0
  • Less than: When the ON input is 1, if IN is less than VAL, OUT outputs 1; otherwise, it outputs 0
  • Not equal to: When the ON input is 1, if IN is not equal to VAL, OUT outputs 1; otherwise, it outputs 0
• ANY_ELEMENTARY contains all basic data types (bit strings, integers, floating point numbers, characters and strings, times and dates)

• ST language relational expression:

OUT := ON & (IN=VAL);//equal to
OUT := ON & (IN>=VAL);//Greater than or equal to
OUT := ON & (IN>VAL);//Greater than
OUT := ON & (IN<=VAL);//Less than or equal to
OUT := ON & (IN<VAL);//Less than
OUT := ON & (IN<>VAL);//not equal to

Example

• LD sample animation is as follows:

• ST sample animation is as follows: