Siemens SCALANCE M874-2 - Page 16

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.