Description
3.6 Design
SIMATIC Rack PC 840 V2
3-10
Operating Instructions, Edition 05/2006, A5E00248055-04
3.6.4
Status displays
Status displays
Display
Meaning
LEDs
Description
FAN
CPU fan status (available only
with active SOM or DiagMonitor
software)
OFF
RED
- Fan speed OK
- CPU not started
(see error dialog)
- Fan speed too low
(see error dialog)
TEMP
Internal temperature monitoring OFF
RED
- Internal temperature OK
- Internal temperature is critical
(see error dialog)
WATCHDOG
WATCHDOG Status display
OFF
GREEN
RED
- WATCHDOG disabled
- WATCHDOG monitoring enabled
- Time-out (see error dialog)
ETHERNET
ETHERNET status display
OFF
GREEN
- not connected
- no data transfer
- data transfer
PROFIBUS /
MPI
Display of the communication
status to the S7 or PROFIBUS
OFF
GREEN
- not connected
- no data transfer
- data transfer
HARDDISK
Display for hard disk access
OFF
GREEN
- No access
- Access
POWER
PC status display
OFF
YELLOW
GREEN
- Disconnected from mains
- Standby (hibernate)
- PC in operation