Siemens SIMATIC Rack PC 840 Manual page 42

Setting Up and Operating the SIMATIC Rack PC 840
Connecting USB Devices
Single as well as several USB devices (mouse, keyboard or printer) can be
connected to a USB port.
S 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 a further USB port is available at the front.
Figure 3-8 USB connections
Notice
Operating systems which do not support Plug and Play (for example, Windows NT
4.0), generally do not allow the operation of USB devices.
3-12
USB ports
SIMATIC Rack PC 840 Manual
A5E00104826-03