SIS function blocks > SIS Math Blocks > Logic Solver Calculation function block > Expressions in DeltaV SIS Software > Functions in Logic Solver Expressions

ATAN function

Arctangent of x. ATAN (x) returns the arctangent of x (operand one) in radians.

Syntax:

'external reference' := ATAN(Real value);

Example: 

VAR     
   T63; T64; T17; T18; (* Temporary values *)
END_VAR;
T63 := .5;
T64 := -.5;
T17 := ATAN(T63);
T18 := ATAN(T64);

The above example shows T63 set to the value of .5 and T64 set to the value of -.5. T17 is set to the result of ATAN(T63), which is 0.4636476090008 and T18 is set to the result of ATAN(T64), which is -0.4636476090008.