Rockwell-automation GMLC Reference Manual Manuel d'utilisateur télécharger pdf (Page 678)

Publication GMLC-5.2 - November 1999

The argument can be any floating point value or expression, but it must

have a value from -1 to 1, inclusive, because the cosine of an angle is

always within this range. The value of the Arc_cosine function is always

an angle from 0 to π radians (180°), inclusive. If the argument is not

between ±1, the value of the Arc_cosine function is zero.

For example, the following expression is evaluated as 1.047xx since the

principal angle whose cosine is 0.5 is 1.047 radians (60°).

Arc_cosine(0.5)

To convert the value of the Arc_cosine function to degrees, multiply by

/π. For example, the following expression is evaluated as 60 (assuming

the user constant Pi has been defined as the value of π) since the

principal angle whose cosine is 0.5 is 60°.

(Arc_cosine(0.5) * 180 / Pi)

The value of the Arc_sine function is the principal angle (in radians)

whose sine is equal to the argument, as shown below.

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Rockwell-automation GMLC Reference Manual Manuel d'utilisateur Page 678