Siemens SIMATIC NET CP 243-2 Manual page 21

Table 1-2 , continued
LED (color) Status
SF (red) System error
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
Technical Description and Installation Instructions
This LED is lit in the following situations:
The CP 243-2 has detected an internal problem (for example a
defective EEPROM).
The CP 243-2 is unable to make the currently required mode
change (for example an AS-i slave with address 0 exists) when a
button is pressed.
Meaning
1-13