siemens tia help

[stu]

i have a question i have a string where i see a product number , but want to be able to if less then/ equals to 1 then turn off a input ?
i have tried a comparator and basic >= but nothing worked ?

im sure this is a basic question ,i just need a little pointing in the right direction

 

[adfox]

I think You need to convert string to integer/double and then You can compare by value not by chars.

 

[JesperMP]

Can you describe the format of the number values in the STRING.
You can play around with STRG_VAL, the parameter FORMAT decides the format of the STRING content.
If the number format is special, then you may have to write your own conversion routine.

 

[adfox]

As JesperMP suggested - play with that function and You should be all right.