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LEDs, connectors, buttons, card slots
2.2 LEDs to display operation
LOGO! CMR2020, LOGO! CMR2040
Operating Instructions, 12/2017, C79000-G8976-C356-04
33
Meaning of the LEDs
LED
Status
Meaning
All LEDs
Flashing
Fatal error
Lit Firmware being updated
Not lit
No voltage present or applied
Device shut down
L
Power supply
Off
No external power supply connected
On
Power supply connected
Flashing
Initialization or change to the configuration
P1
LAN
Lit green
Connection to Ethernet is established.
Part flashes yel-
low and part lit
green
Data
Off
No connection to Ethernet or no cable connected.
R
Signal strength (mobile wireless)
Lit green
Very good
Lit yellow
Medium
Off
No or very bad signal
Flashing
Data
F
Error
OFF
No error
ON
Error, see also section Disruptions and their possible causes
(Page 142).
33


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