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Installation and Commissioning 
 
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches 
106 
C79000-G8976-C186-03 
6.8 LED 
Display 
Overview 
The following table shows the states indicated by the LEDs in the various display 
modes. For more detailed information, refer to the subsections listed in the first col-
umn. 
  
LED 
Display 
Mode A 
Display 
Mode B 
Display 
Mode C 
Display 
Mode D 
 
F 
Problem, signaling contact opens 
 
L1 
Power supply L1 is applied. 
Power supply 
L1 is moni-
tored 
 
Power Module
 
(See 6.8.3) 
L2 
Power supply L2 is applied. 
Power supply 
L2 is moni-
tored 
 
IN1/IN5  Signal at in-
put IN1 
Signal at input 
IN5 
Signal at input 
IN1 
Signal at input 
IN5 
 
IN2/IN6  Signal at in-
put IN2 
Signal at input 
IN6 
Signal at input 
IN2 
Signal at input 
IN6 
 
IN3/IN7  Signal at in-
put IN3 
Signal at input 
IN7 
Signal at input 
IN3 
Signal at input 
IN7 
 
DI Module
 
(See 6.8.4) 
IN4/IN8  Signal at in-
put IN4 
Signal at input 
IN8 
Signal at input 
IN4 
Signal at input 
IN8 
 
RM 
Device is operating as RM 
 
STBY 
Reserved (no function) 
 
DM1 
off on  off on 
 
Switch CPU
 
(See 6.8.5) 
DM2 
off off  on on 
 
P1 
 
P2 
 
P3 
 
Ports 
(See 6.8.6) 
P4 
Port status 
Transmission 
rate 
Half / full du-
plex 
Fault mask