22
3. Signalling
The gateway’s 6 LEDs and the descriptive label on the removable cover which hides its block of selector
switches allow you to diagnose the status of the gateway:

c

e

g

d

f

h

telm

LUFP9
n o
p q
r s
1 NETWORK STATUS
2 MODULE STATUS
3 NOT USED
4 NOT USED
5 MODBUS
6 GATEWAY
DeviceNet™
LED LED Æ Gateway state
Off: Gateway not connected to
the DeviceNet bus
Green: Gateway connected to
the DeviceNet bus:
Connection established
Red: Fatal error on connection
to the DeviceNet bus
Flashing (green): Gateway
connected to the DeviceNet bus:
Connection not established
nNETWORK
STATUS
Flashing (red):Timeout in
connection to the DeviceNet bus
The length of this timeout is
defined by the DeviceNet master
pNOT USED Off: —
Off: No power
Flashing (green): No Modbus
communications
Green: Modbus
communications OK
rMODBUS
Red: Loss of communication with
at least one Modbus slave (1)
LED LED Æ Gateway state
Off: No power
Red: Unrecoverable failure
Green: Gateway is operational
oMODULE
STATUS
Flashing (red): Minor fault
qNOT USED Off: —
Off: No power
Flashing (red/green):
Configuration absent / not valid
Use AbcConf to load a valid
configuration
Green: Gateway currently being
initialized and configured
sGATEWAY
Flashing (green): Gateway is in
running order: Configuration OK
(1) The LED r MODBUS becomes red whenever you use incorrect values in the outputs corresponding to the queries
of the two aperiodic services designed to read/write the value of any parameter of a Modbus slave (see chapter 4.2.8
Description of Services Assigned to Gateway Inputs/Outputs, page 31). This LED will only revert to its former
green state if you reuse these very same services, but with correct values. More generally, this LED becomes red,
then reverts to a green state, on loss and recovery of the communications with any Modbus slave.
N.B. If the DEVICE STATUS LED s is flashing following a sequence beginning with one or
more red flashes, we advise that you note down the order of this sequence and give this
information to the Schneider Electric support service.
In some cases, all you need to do is power the gateway off then back on again to solve the problem.