Lenze DDS v2.0 - Manual (Page 8)

Introduction to IEC 61131-3 programming
The software model
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DDS-IEC61131 EN 2.0
2.2.3 Functions
Unlike FBs, functions cannot buffer their internal values. Thus, they cannot use global variables,
access function blocks and declare directly addressable variables. All functions have in common
that they return the same output parameters if the input parameters are the same.
Overview: IEC 61131-3 standard functions
Type conversion functions
..._TO_...
Conversion between integers
BOOL_TO BOOL Þ Type X
TO_BOOL Type X Þ BOOL
TIME_TO / TIME_OF_DAY TIME / TIME_OF_DAY Þ Type X
DATE_TO / DT_TO DATE / DATE_AND_TIME Þ Type X
STRING_TO STRING Þ Type X
TRUNC REAL Þ INT
Numeric functions
ABS
Absolute value
SQRT Square root
LN Natural logarithm
LOG Logarithm to the base 10
EXP Exponential function
SIN Sine calculation in rad
COS Cosine calculation in rad
TAN Tangent calculation in rad
ASIN Arcus sine calculation in rad
ACOS Arcus cosine calculation in rad
ATAN Arcus tangent calculation in rad
EXPT Exponentiation of one variable with another
STRING functions
LEN
Indicates the string length
LEFT Shows a left initial string
RIGHT Shows a right initial string
MID Shows a part of a string
CONCAT Concatenation (connection) of two strings
INSERT Inserts a string at a certain position into another string
DELETE Deletes a part of a string
REPLACE Replaces a part of a string by another part
FIND Finds a part of a string
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