Lenze DDS v2.3 Manual do Utilizador descarregar pdf (Página 299)

100

101

Drive PLC Developer Studio

IEC 61131-3 Standard functions

14-7

l DDS EN 2.3

14.2.11 ATAN

Returns the arc tangent (inversion of tangent) of a number in radians

Examples

IL ST FBD

LD 0.5

ATAN

ST q (* q=0.4636476 *)

q:=ATAN(0.5);

14.2.12 EXPT

Exponentiation of one variable with another:

OUT = IN1

IN2

• OUT is of type REAL.

• IN1 and IN2 canbeoftypeBYTE, WORD, DWORD, INT, DINT, REAL.

Examples

IL ST FBD

LD 7

EXPT 2

ST var1 (* var1=49 *)

var1:=EXPT(7,2);

14.3 STRING functions

Note!

The permissible string length is dependent on the applied automation system.

If the length is exceeded, an error message will be displayed in online mode.

14.3.1 LEN

Returns the length of a string

• STR is of type STRING, the return value of the function type INT.

Examples

IL ST FBD

LD ’SUSI’

LEN

ST Var1 (* Var1=4 *)

Var1:=LEN(’SUSI’);

14.3.2 LEFT

Returns a left start string of a string

• STR is of type STRING, SIZE of type INT, the return value of the function type STRING.

• LEFT(STR,SIZE) means: Take the first SIZE characters from the left in the string STR.

Examples

IL ST FBD

LD ’SUSI’

LEFT 3

ST Var1 (* Var1=’SUS’ *)

Var1:=LEFT(’SUSI’,3);

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