Datalogic AMT58 Series Manual page 411

AMT58x-PB Profibus®
4.9 Diagnostic LEDs
Two LEDs located in the rear side of the connection cap are
designed to show the operating or fault status of the Profibus-DP
interface.
Power
Fault (red)
(green)
OFF
OFF
OFF Flashing
ON Flashing
ON
Flashing
Flashing Flashing
12
OFF No power supply or hardware fault
ON Correct operation (correct communication)
Red Zone, see section "6.9 Red Zone"
Configuration parameters not valid
OFF Transmission time-out error
ON Bus communication failure
Flash memory error
Event