Rockwell-automation 1771-DB Basic Module User Manual - Series A Manual de usuario descargar pdf (Pagina 83)

Operating Functions

Chapter 5

5–46

5.5.2.1.6 RND

Returns a pseudo-random number in the range between 0 and 1 inclusive.

The RND operator uses a 16-bit binary seed and generates 65536

pseudo-random numbers before repeating the sequence. The numbers

generated are specifically between 0/65535 and 65535/65535 inclusive.

Unlike most BASICS, the RND operator in the BASIC Module does not

require an argument or a dummy argument. If an argument is placed after

the RND operator, a BAD SYNTAX error occurs.

Examples:

uPRINT Rnd

.30278477

5.5.2.1.7 PI

PI is a stored constant. In the BASIC Module PI is stored as 3.1415926.

5.5.2.2

Log Functions

Following are the log functions.

5.5.2.2.1 LOG([expr])

Returns the natural logarithm of the argument. The argument must be

greater than 0. This calculation is carried out to 7 significant digits.

Examples:

uPRINT LOG(12) uPRINT LOG(EXP(1))

2.484906 1

5.5.2.2.2 EXP([expr])

This function raises the number “e” (2.7182818) to the power of the

argument.

Examples:

uPRINT EXP(1) uPRINT EXP(LOG(2))

2.7182818 2

5.5.2.3

Trig Functions

5.5.2.3.1 SIN([expr]

Returns the sine 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 SIN(PI/4) uPRINT SIN(0)

.7071067 0

5.5.2

Unary Operators

(continued)

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 166 167

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