If you have 840D powerline (drive is 611D)--check my attachment , you can set "Feed Rate override Active "  DB21.DBX6.7 =0 

and if you can find in DBB4 =xxxxxxxxx the code for 100% 

using loading function of S7 PLC to keep it 

you need have ability of PLC programming

morgan_berlese163

Hello, I am working on an INDEX G420 with a Siemens 840D control panel. I have a question: for certain operations, such as probing or some machining with a feed linked to the rotation, I would like to be able to lock the feedrate at 100%. Do you know the parameter that would allow me to do this? Thank you in advance."