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Connection
5.5 Connecting peripherals
5.5.3
USB
Introduction
Readily available USB peripherals can be easily and flexibly connected via the USB port.
You can connect a USB keyboard and a USB mouse, for example. If a USB keyboard
features a USB port (USB hub) itself, you can connect other USB peripherals, such as a
mouse, directly to the keyboard.
USB port
There are several types of USB peripherals:
• Low power devices: maximum 100 mA power consumption, e.g. mouse and keyboard
• High power devices: maximum 500 mA power consumption, e.g. hard disk and floppy
drive
Note
The general USB specifications apply to the USB ports on the computer unit.
Applies to Windows 2000 and Windows XP: The USB port on the front panel has been
approved for a maximum of one additional USB HUB.
Using USB peripherals
Notice
When installing a USB device for the first time, ensure you have the required device driver.
Before removing an intelligent USB device, deactivate the device in the operating system
using the dialog "Unplug or Eject Hardware". For additional information, refer to the
documentation of the operating system.
Connect USB devices
Caution
Wait at least 10 seconds before disconnected and reconnecting USB devices. This also
applies to touch-screen front panels, especially touch panels.
Notice
When using standard USB peripherals, please bear in mind that their EMC immunity level is
frequently designed for office applications only. These device may be used for
commissioning and servicing. However, only industry-standard devices are allowed for
industrial operation.
The USB peripherals are developed and marketed by individual vendors. The respective
manufacturers offer support for the peripherals. Moreover, the terms of liability of the
individual vendors or suppliers apply here. More information about connecting USB devices
is available in the "Commissioning" chapter.
5-6
Operating Instructions, Edition 10/2004, A5E00339979-01
Panel PC IL 77
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