Siemens S7-1200 Operating Instructions Manual page 30

LEDs and connectors
2.2 LEDs
DIAG NETWORK
(red / green) (red / green)
Quality of the mobile wireless connection
- -
- -
- -
- -
-
flashing red
VPN connections
-
-
- -
Loading firmware
flashing green
flashing red
30
CONNECT SIGNAL
QUALITY
(green)
(yellow / green)
-
-
-
-
-
- -
- -
- -
VPN Meaning
(green)
- Good network (-73 ... ≥ -51 dBm)
- Medium strength network (-89 ... -74 dBm)
- Weak network (-109 ... -90 dBm)
- No network (≤ -110 dBm)
- Missing external power supply
VPN connection established
No VPN connection established
No VPN connection configured on the CP
Loading firmware.
The "DIAG" LED flashes alternating red and
green.
Firmware was successfully loaded.
Error loading firmware
•
or
Internal error of the CP; remedy: Power
•
OFF → ON
Operating Instructions, 01/2015, C79000-G8976-C381-01
CP 1243-7 LTE