Jump to content

Recommended Posts

Posted

I have a Samba sm43-j-r22. 

I need to search in Data Table a row that has a column (of type string) with an empty value.

I have tried using the function "Data Tables Find Row" with the "Start address of value to find" with an MI operand with value equals to 0, because I think that an empty string has it first byte equals to null. But It wasn't succesful.

How can I acomplish this?

Posted

I had to do this a few years ago and couldn't find a way to do with the string.

 

I finally added and extra column into the data table which was a MI and searched for it.   0 Meant that it had an empty string field  1 meant that the string field had data in it.

You'll have to make sure that when you get a new PLC you write a blank DT into it as often there is garbage in the DT which will mess with the above solution.

Posted

Yes, I've  tested with 0, I think that there is a bug when searching for empty strings...

Cheers, and have a Happy new year also !

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

This site uses cookies. By clicking I accept, you agree to their use.