Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 84)

Operating Functions

Chapter 5

5–47

5.5.2.3.2 COS([expr])

Returns the cosine of the argument. The argument is expressed in radians.

Calculations are carried out to 7 significant digits. The argument must be

between " 200000.

Examples:

uPRINT COS(PI/4) uPRINT COS(0)

.7071067 1

5.5.2.3.3 TAN([expr])

Returns the tangent of the argument. The argument is expressed in radians.

The argument must be between "200000.

Examples:

uPRINT TAN(PI/4) uPRINT TAN(0)

5.5.2.3.4 ATN([expr])

Returns the arctangent of the argument. The result is in radians.

Calculations are carried out to 7 significant digits. The ATN operator

returns a result between –PI/2 (3.1415926/2) and PI/2.

Examples:

uPRINT ATN(PI) uPRINT ATN(1)

1.2626272 .78539804

5.5.2.4

Comments on Trig Functions

The SIN, COS and TAN operators use a Taylor series to calculate the

function. These operators first reduce the argument to a value between 0

and PI/2. This reduction is accomplished by the following equation:

reduced argument = (user arg/PI – INT(user arg/PI)) * PI

The reduced argument, from the above equation, is between 0 and PI. The

reduced argument is then tested to see if it is greater than PI/2. If it is, then

it is subtracted from PI to yield the final value. If it is not, then the reduced

argument is the final value.

5.5.2

Unary Operators

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Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario Pagina 84