Siemens SIMATIC NET CP 343-1 ERPC Manual page 26

LED displays
LEDs for displaying the mode
The different combinations of the LEDs on the front panel indicate the status:
Table 4- 1
SF(red)
Legend - meaning of the symbols:
Symbol
Status
Firmware download - LED display patterns
The LED display patterns when downloading the firmware are described in section How to
load new firmware (Page 69).
26
LED display schemes
BF (red) RUN (green)
-
-
ON (steady light)
STOP (yellow)
- -
OFF
CP operating mode
Starting up after power "ON"

or
Stopped (STOP) with errors

For example no valid C-PLUG
detected
In this state, the CPU or
intelligent modules in the rack
remain accessible using PG
functions.
Starting up (STOP → RUN)
Running (RUN)
Stopping (RUN → STOP)
Stopped (STOP)
In STOP mode, configuring and
performing diagnostics on the CP
remain possible.
Interface networked but no LAN

cable inserted
or
Duplicate IP address detected

RUN with external error
Module fault / system error
Flashing
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02
-
Any