Hi, I am trying to use a retentive timer on my application. I’m building my application on ladder logic. However, I do not have a retentive timer in the software. Every time I try to add one, it does not show up. It is supposed to be called TON_R based on the help window but it seems to not exist in the software. Is there any other way to be able to use one? Thanks, Diego
Hi Diego, Please check that you have a library in your project called “PLCnext Controller”. If not, you can add this library using the “Add Library …” context menu on the “Libraries” folder (on the lower right of the screen). This library is added automatically to projects that are created from one of the the project templates on the start page. Once this library is added, you will see the TON_R FB in the Programming tree: 
Hope this helps. ~ Martin.
That worked perfectly! Thank you for the quick response. Diego.