BECKHOFF CB4060 - Manual (Page 39)

LAN Activity LED Chapter: State LEDs
Beckhoff New Automation Technology CB4060 page 39
4.3 LAN Activity LED
The CB4060 has two unicolor LEDs, which signal LAN activity of the current LAN port.
LAN link activity:
Color Interval Meaning
none solid no LAN activity
green flashing LAN active
N OTE
These LEDs are not mounted on G1 versions of the CB4060.