Siemens SIMATIC Series Manual page 41

Connecting USB Devices
Single as well as several USB devices (mouse, keyboard or printer) can be
connected to a USB port.
• Insert the USB device connector into the USB port.
The device is recognized by the Plug and Play operating system and is then
available.
A USB keyboard can be used to manipulate the BIOS setup.
Note
For repair and maintenance purposes two further USB ports are available at the
front (optional equipment).
Notice
Operating systems which do not support Plug and Play (for example,
Windows NT), generally do not allow the operation of USB devices.
SIMATIC Rack PC IL 40 SManual
A5E00200171-01
Setting Up and Operating the SIMATIC Rack PC IL 40 S
3-11