Local Diagnostics; Leds On The Network Interface Unit - GE VersaPoint IC220PBI002 User Manual

6

Local Diagnostics

Diagnostics information is provided by LEDs on the Profibus NIU and the modules
attached to it. In general, the I/O Station is operating correctly if all diagnostic
LEDs are constantly lit and green. If any LEDs are red or blinking, refer to the
diagnostics information below.

LEDS on the Network Interface Unit

The diagnostic LEDs on the NIU indicate the type and location of the error. The
NIU is functioning correctly if all of the green LEDs are on. Once errors have been
removed, the indicators immediately display the current status.
6-2 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
NIU LED Color Meaning
UM Green Supply voltage in the main circuit for the NIU,
communications power and interfaces present.
US Green 24 V segment circuit supply present
BF Red No communication on Profibus
FS Red Defines the function of the FN LED:
FS ON: FN indicates the type of error.
FS OFF: FN indicates the error number
FN Red The number of flashing pulses indicates the type of
error or the error number, depending on whether FS
is on or not
GFK-1911B