Here is a Mixing Station mod for Farming Simulator 2015.
Mod version: v 3.0.
You can use this mixing station as a feed mixer in a large quantities, for cows and more.
The silos have 3 analog level indicators, in addition the exact levels will be displayed in the control cabinet in the help text.

The signal lamp modes:
- Flashing red = a silo is empty
- Flashing amber = mixing tank full
- Green = all right (it is produced)
So you do not have to constantly go to the control, there is a message system in the manner of a "live ticker"
displaying messages on the top of the screen.