OK, one detail was missing.
In the check menu, select the PLC/IF page (it is the page where you can see the I/O of the machine). At the bottom of the page you should have 2 groups of 3 brackets (). Input 1001 in the first brackets you have at the bottom, skip the next brackets and input M in the third, then press enter. This will enable the parameters pages. When you select tool/param page, go until you get to Basis 2 page and modify number 24. It works with TX 8F. The parameters pages will be not available after power off and on, until the next time you input the password 1001>>M.
If it does not work, you can get all details from Mr. Uwe Radtke in Traub. He is top professional and very helpful.
uwe.radtke@index-werke.de He saved my life more than once....