String instructions
262
Part II IEC Instructions
LEN
String Length
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
PLC types
Availability of LEN (see page 1328)
If the string is longer than the length defined for the input variable
(input_string) in the field "Type", an error occurs (see Special Internal
Relays for Error Handling).
The number of steps may vary depending on the PLC and parameters
used, see also Table of Code Intensive Instructions in the online help.
When using the data type STRING with small PLCs like FP-e or FP0,
make sure that the length of the result string is equal to or greater than
the length of the source string.
For further information refer to the online help: Upgrade Problems with
Data Type STRING
Data type I/O Function
STRING input input data type
INT output length of string
No. IEC address Set If
R9007 %MX0.900.7 permanently
R9008 %MX0.900.8 for an instant
input string is longer than the length
defined for the input variable in the field
"Type"
Description
LEN calculates the length of the input string and writes the result into the output variable.
Data types
Error flags
Example
In this example, the same POU header is used for all programming languages. For an example
using IL (instruction list), please refer to the online help.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
In this example the input variable (input_string) has been declared. Instead, you may enter the
string ('Panasonic') directly into the function. The string has to be put in inverted commas, both in
the POU header and in the function.
Body
The length (9) of input_string (‘Panasonic’) is written into output_value.
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