Festo — CMMT-ST-C8-1C-...-S0 — 2021-04b
Malfunctions
43
LED
Meaning of the yellow LED
Remedy
Off
No data traffic
–
Flashe
s/
lights
up
yellow
1)
Data traffic activity (traffic).
–
1) The LED flashes during the transmission of an Ethernet packet. If packets are constantly being transmitted, the flashing changes to a
steady light.
Tab. 53: Yellow LED at XF1 IN and XF2 OUT
8.1.5
Device and interface status, EtherNet/IP
EtherNet/IP LED displays (CMMT-ST-...-EP only)
Together with the 4 LEDs on the top (Link/Activity), the MS LED and NS LED on the front display the
bus/network status.
EtherNet/IP, MS LED; module status
LED
Meaning
Remedy
Off
Logic voltage supply lacking.
Check logic voltage supply.
Flashe
s
green
Device is not configured.
Perform configuration.
Lights
up
green
Normal operating status
–
Flashe
s red/
green
Device performs a self-test.
–
Flashe
s red
Rectifiable error, possibly a configura-
tion error
Check configuration.
Lights
up red
Error cannot be rectified
Contact Festo Service
Tab. 54: MS LED
EtherNet/IP, NS LED; network status
LED
Meaning
Remedy
Off
The device is switched off or has no IP
address.
Switch on device or check IP address.
