
8
Operation
DHF21B/41B controller
Manual – DHE/DHF/DHR21B (standard) and DHE/DHF/DHR41B (advanced)
67
Status LED
Possible cause
Measure
Orange
PROFIBUS hardware is being initial-
ized.
–
8.2.2
LEDs in DeviceNet
TM
mode
LED "L16" (MOD/NET)
The function of LED "L16" (MOD/NET = Module/network state) described in the follow-
ing table is specified in the DeviceNet specification.
State LED
Possible cause
Measure
Off
Not switched on or offline •
Unit is offline.
•
Unit is performing DUP-MAC check.
•
Device is switched off.
Flashing green with 1 Hz
Online and in operational
mode
•
The unit is online and no connection has been
established.
•
DUP-MAC check was performed successfully.
•
A connection has not yet been established with
a master.
•
Missing, incorrect or incomplete configuration.
Green
Online, operational mode
and connected
•
Unit is online.
•
A connection has been established with a mas-
ter.
•
Connection is active (established state).
Flashing red with 1 Hz
Minor fault or connection
timeout
•
A correctable fault has occurred.
•
Polled I/O and/or bit-strobe I/O connections are
in timeout state.
•
DUP-MAC check has detected an error.
Red
Critical error or critical link
failure
•
An error that cannot be corrected has occurred.
•
BusOff
•
DUP-MAC check has detected an error.
LED "L15" (PIO)
LED "L15" (Polled I/O) monitors the polled I/O connection.
State LED
Possible cause
Measure
Green, flashing every
125 ms
DUP-MAC check
Unit is performing DUP-MAC check.
Off
Not switched on or offline
but no DUP-MAC check
•
Device is switched off.
•
Unit is offline.
Flashing green with 1 Hz
Online and in operational
mode
•
Unit is online.
•
DUP-MAC check was performed successfully.
•
A polled IO connection is being established with
a master (configuring state).
•
Missing, incorrect or incomplete configuration.
22900055/EN – 08/2016
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