Siemens PC 870 - Manual (Page 18)

Description of Device
2-2
SIMATIC Panel PC 670 / 870 Operating Unit, Equipment Manual
Edition 07/01
2.1 Operating units with key-based front panels
The number of keys, their labeling and their functionality are identical
on all operating units featuring key-based front panels. The various ty-
pes of front panel differ only in the arrangement the keys and the size
and type of display. Figure 2-1 shows the front view of the 12” version
as an example to illustrate the status indicators, the different keypads,
the USB interface, display and mouse.
Integrated mouse USB interface
Alpha, numeric, cursor and control keys Status indicators Function keys/soft keys
Display
Fig. 2-1 Example: 12” version of the operating unit with key-based front panel
2.1.1 Status indications
Information about the operation status is supplied by the two LEDs at
the upper left side of the keyboard:
S The left LED (”POWER”) lights when the power supply works
S The right LED (”TEMP”) lights when a temperature threshold is ex-
ceeded (see “SOM–program” in chapter 7 of the “Computing Unit”
Manual).