Definition
Numeric IEC operator for returning the arc tangent (inverse function of tangent) of a number. The value is calculated in arch minutes.
The input variable can be of any numeric basic data type where the output variable has to be type REAL or LREAL.
Example in IL
The result in q is 0.463648.
LD 0.5
ATAN
ST q
Example in ST
q:=ATAN(0.5);
