Panasonic FP Series Programming Manual page 263

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Table of Contents

String instructions

LEN calculates the length of the input string and writes the result into the output variable.

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

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.

All input and output variables used for programming this function have been declared in the POU

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.

The length (9) of input_string ('Panasonic') is written into output_value.

String Length

input data type

length of string

for an instant

 input string is longer than the length

defined for the input variable in the field