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ST Language Configuration Section 5-4
Note The data type returned for numerical functions is the same as that used in the
argument. Therefore, variables substituted for function return values must be
the same data type as the argument.
Text String Functions The following functions can be used with CS/CJ-series CPU Units with unit
version 4.0 or later, or CJ2-series CPU Units.
EXPT (base, expo-
nent)
Base REAL,
LREAL
REAL, LREAL
Exponential: Base
exponent
a: = EXPT (b, c)
(*Exponential with variable b
as the base and variable c
as the exponent is stored in
variable a*)
Exponent INT,
DINT,
LINT,
UINT,
UDINT,
ULINT
Function Argument data type Return value
data type
Description Example
Function Argument data type Return
value
data type
Description Example
LEN(String) String STRING INT Detects the length
of a text string.
a: = LEN (b)
(*number of characters in string
b stored in variable a*)
LEFT(<Source_string>,
<Number_of_characters>)
Source_
string
STRING STRING Extracts charac-
ters from a text
string starting from
the left.
a: = LEFT (b,c)
(*number of characters specified
by variable c extracted from the
left of text string b and stored in
variable a*)
Number_of_
characters
INT,
UINT
RIGHT(<Source_string>,
<Number_of_characters>)
Source_
string
STRING STRING Extracts charac-
ters from a text
string starting from
the right.
a: = RIGHT (b,c)
(*number of characters specified
by variable c extracted from the
eight of text string b and stored
in variable a*)
Number_of_
characters
INT,
UINT
MID(<Source_string>,
<Number_of_characters>,
<Position>)
Source_
string
STRING STRING Extracts charac-
ters from a text
string.
a: = MID (b,c,d)
(*number of characters specified
by variable c extracted from text
string b starting at position spec-
ified by variable d and stored in
variable a*)
Number_of_
characters
INT,
UINT
Position INT,
UINT
CON-
CAT(<Source_string_1>,<S
ource_string_2>,...) *Up to
32 source strings.*
Source_
string
STRING STRING Concatenates text
strings.
a: = CONCAT (b,c...)
(*text strings b, c... are joined
and stored in variable a*)
INSERT(<Source_string>,
<Insert_string>,<Position>)
Source_
string
STRING STRING Insert one text
string into another.
a: = INSERT (b,c,d)
(*text string c inserted into text
string b at position specified by
variable d and resulting string
stored in variable a*)
Insert_
string
STRING
Position INT,
UINT
DELETE(<Source_string>,
<Number_of_characters>,
<Position>)
Source_
string
STRING STRING Deletes characters
from a text string.
a: = DELETE (b,c,d)
(*number of characters specified
by variable c deleted from text
string b starting from position
specified by variable d and
resulting string stored in variable
a*)
Number_of_
characters
INT,
UINT
Position INT,
UINT
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