IM151-1 FO STANDARD interface module (6ES7151-1AB05-0AB0) 
Manual, 02/2010, A5E01075965-03 
33 
Error and system messages 
4
4.1  LED displays on the interface module 
LED display  
1 
2 
3 
6)
%)
21
(76
 
①  Group error (red) 
②  Bus fault (red) 
③  Supply voltage (green) 
Status and error displays  
Table 4- 1  Status and error messages of the IM151-1 FO STANDARD 
Event (LEDs) 
SF  BF  ON 
Cause  Remedy 
Off  Off  Off  There is no voltage at the interface module, 
or the interface module has a hardware 
defect. 
Switch on the 24 V DC supply voltage at the 
interface module. 
*  *  On  There is voltage at the interface module.  --- 
*  Flashing  On  The interface module is not configured or is 
configured incorrectly. No data exchange is 
taking place between the DP master and the 
interface module. 
Causes: 
  The PROFIBUS address is incorrect. 
  Configuration error 
  Parameter assignment error 
  Check the interface module. 
  Check the configuration and parameter 
assignment. 
  Check the PROFIBUS address.