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LED
F
L
SC
Q
SCALANCE M874, M876
Operating Instructions, 02/2023, C79000-G8976-C331-12
Status
Meaning
OFF
No fault/error.
ON
The device is starting up or an error has occurred.
Possible errors/faults:
•
Wrong PIN number
•
The inserted PLUG has an invalid or incompatible configuration.
Flashing
The bootloader waits in this state for a new firmware file that you can
download using TFTP.
Flashing
Firmware on PLUG
The device is performing a firmware update or downgrade.
at the inter‐
val: 2000
ms on / 200
ms off
OFF
Device turned off, no power supply.
ON
Device turned on, power supply present.
OFF
SIM card OK, no connection.
ON
Wrong PIN number / SIM card error
ON
Connection established.
OFF
No reception or mobile wireless disabled
Signal strength: < -109 dBm
Flashing
Signal strength bad: -89 dBm to -109 dBm
On
Signal strength medium: -73 dBm to -89 dBm
ON
Signal strength good: > -73 dBm
Description of the device
3.6 LED display
35
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