Lenze DDS v2.3 - Manual (Page 299)

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
can be of type BYTE, 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);
Show/Hide Bookmarks