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Introduction to IEC 61131-3 programming

The software m odel

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_DA Y TIME / TIME_OF_DAY Þ Type X

DA TE_TO / DT_TO DA TE / 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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Lenze DDS v2.0 Manual de usuario Pagina 8