The IEC operator yields the arccosine value of a number. The value is computed in radians.

Permitted data types for input variables that measure the angle in radians: any numeric basic data type

Permitted data types for output variables: ‎REAL‎ and ‎LREAL‎

Examples

Result in q: 1.0472

ST

q := ACOS(0.5);

FBD