Allen-Bradley ControlLogix DeviceNet 1756-DNB User Manual

ControlLogix DeviceNet Scanner Module 19
Publication 1756-IN566B-EN-P - April 2001
Interpreting the LED Status Indicators
The three LED status indicators on the module provide information
about your network and its connections. The following tables outline
the indicator condition and the corresponding status, and explain
what each condition means.
Module/Network (MOD/NET) Status Indicator
This bi-color (green/red) LED provides device and communication
status as follows:
Condition Status Indicates
off not powered/
not online
Device is not online.
• The device has not completed the
Dup_MAC_ID test yet.
• The device may not be powered.
green device operational
AND online and
connected
Device is operating in a normal condition and is
online with connections established.
• For a group 2 Only device, this means the
device is allocated to a Master.
• For a UCMM capable device, this means the
device has one or more established
connections.
flashing
green
(1)
(1)
The flash rate of the LED is approximately 1 flash per second. The LED should be on for approximately
0.5 seconds and off for approximately 0.5 seconds.
device operational
AND online and not
connected
or
device online and
device needs
commissioning
The device is operating in a normal condition and is
online with no connections established.
• The device has passed the Dup_MAC_ID test,
is online, but has no established connections
to other nodes.
• For a Group 2 only device, this means that the
device is not allocated to a master.
• For a UCMM capable device, this means that
the device has no established connections.
• Configuration missing, incomplete, or incorrect.
flashing
red
(1)
minor fault and/or
connection time-out
Recoverable fault.and/or one or more I/O
connections are in the timed-out state.
red critical fault or critical
link failure
Device has an unrecoverable fault and may need to
be replaced.
Failed communication device. The device has
detected an error (duplicate MAC ID or bus-off) that
has rendered it incapable of communicating on the
network.
Allen-Bradley

Allen-Bradley ControlLogix DeviceNet 1756-DNB Specifications

General

Brand	Allen-Bradley
Model	ControlLogix DeviceNet 1756-DNB
Category	Control Unit
Language	English