Hello, sorry for my translated English. Using image 1.3.1 I can't find the uinput module to install the egalax drivers. Can I ask you how you did it? A thousand thanks.

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Split from Adding touch screen driver to example img.

i used there tool to build the costum image and add the modules.
Do:

git clone https://github.com/siemens/meta-iot2050

cd meta-iot2050

git checkout V01.03.01

go to folder ./recipes-kernel/linux/files

and add the missing module to the file iot2050_defconfig_extra.cfg

CONFIG_INPUT_UINPUT=y
CONFIG_HIDRAW=y

 After that you will need to build the image as it says in the read me of the git repo(the image that you want to build is example-image).

./kas-container menu

 Hope this helps 

Hi, following the user guide: "AutoGen_4240943", 
the problem is solved. 
A "Simatic IFP2200" is currently connected and working. 
A thousand thanks.