Siemens SIMATIC Rack PC 840 - Page 7

7
Getting Started Rack PC 840
A5E00104828-04
1 Front Panel
The front panel has openings for device ventilation. A filter mat and the fans are located behind this
front panel. It can only be removed when the front door is open. Please check the filter mat regularly
for dirt and replace it if necessary.
2 LEDs
The LEDs show the operating mode of the device:
FAN red CPU does not start or fan speed is too low.
The fan status is only displayed when SOM or SOL is enabled.
TEMP red Inner temperature is critical.
Check the filter mat or contact the Customer Support.
WATCHDOG green
red
off
Watchdog monitoring is switched on.
Monitoring time has run out.
Watchdog is not activated.
ETHERNET green
off
Data traffic
No data traffic or no connection
PROFIBUS/MPI green
off
Data traffic at Profibus DP
No data traffic at Profibus DP or no connection to Profibus DP
HARDDISK green Lights up when hard disk is being accessed
POWER
yelllow
green
off
Standby, PC is in hibernate mode.
Power, PC is in operating mode.
Mains plug is removed.
3 Front Door
The front ports and the screw to unlock the housing cover are protected against dirt and unauthorized
access by means of a door. Please keep the front door closed during normal operation. The Microsoft
Windows Product Key is located on the inside of the front door.
Caution
Only qualified personnel is authorized to open the Rack PC or carry out repairs or maintenance
work.
4 Lock
To prevent unauthorized access you can lock the front door.