Siemens SIMATIC Rack PC 840 - Front View with Closed Front Door

Welcome to the SIMATIC Rack PC 840
2-2
SIMATIC Rack PC 840 Manual
A5E00104826-03
2.1 Front View with Closed Front Door
1 2 3 4
Figure 2-1 Front View with Closed Front Door
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.