Description of the device
1.3 LED display
SCALANCE M874, M876
16
Operating Instructions, 06/2015, C79000-G8976-C331-05
LED
Status
Meaning
P1
P2
P3
P4
OFF
Ethernet connection to local computer or LAN not established
ON
Ethernet connection to local computer or LAN established
ON
Device receiving / sending data
DI
OFF
Digital input inactive
ON
Digital input active.
DO
OFF
Digital output inactive
ON
Digital output active.