Siemens Industrial PC Simatic Panel PC 677B - Manual (Page 19)

Connecting
4.1 Connection elements and operator controls
SIMATIC Panel PC 677B
Operating Instructions (Compact), 06/2008, A5E02217246-01
19
NOTICE
On / Off switch
The On / Off switch does not disconnect the device from the mains. When the switch is in
the 0 position, the device is still connected to the auxiliary voltage.
Connection components of the control unit
USB connection control unit
Pos Name Description
(1) USB 1 connection
USB 2.0 high current /
500 mA
under sealed cover
(not available with every
product variant).
NOTICE
Ensuring degree of protection P65
When the sealed cover over the USB interface is removed in order to connect a USB
component, the IP65 degree of protection for the device is no longer guaranteed.
Note
Use of USB devices
•
Wait at least ten seconds between removal and reconnection of USB devices. This also
applies to control units with touch screen panels, especially for touch operation.
• When using standard USB peripherals, bear in mind that their EMC immunity level is
frequently designed for office applications only. These devices may be used for
commissioning and servicing. However, only industry-standard devices are allowed for
industrial operation.
• 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.