26 Rockwell Automation Publication 1756-UM004A-EN-P - March 2019
Appendix A ControlLogix Network Device Status Indicators
Network Status (NET) Indicates if CIP connections are established.
IMPORTANT: The new-series 1756-EN2TR and
1756-EN3TR modules have a NET status indicator.
The older-series 1756-EN2TR and 1756-EN3TR
modules do not have a NET status indicator.
Off One of these conditions exists:
• The module is not powered.
– Verify that there is chassis power.
– Verify that the module is completely inserted into the
chassis and backplane.
– Make sure that the module has been configured.
• The module is powered but does not have an IP address.
Assign an IP address to the module.
Flashing green The controller has an IP address and one of these conditions
exists:
• The module has not established any CIP connections.
If connections are configured for this module, check the
connection originator for the connection error code.
• All connections to the device have timed out or been closed.
Green The module has established at least 1 CIP connection and is
operating properly. The IP address scrolls across the Module
Status display.
Red The module is in conflict mode. It shares an IP address with
another device on the network. The module’s current IP address
scrolls across the Module Status display. The display scrolls: OK
<IP_address_of_this_module> Duplicate IP
<Mac_address_of_duplicate_node_detected>
For example: OK 10.88.60.196 Duplicate IP - 00:00:BC:02:34:B4
Change the module’s IP address.
Flashing green/
flashing red
The module is performing its power-up testing.
Link Status
(LINK 1, LINK 2)
Off One of these conditions exists:
• The module is not powered.
– Verify that there is chassis power.
– Verify that the module is completely inserted into the
chassis and backplane.
– Make sure that the module has been configured.
• No link exists on the port.
•The port is administratively disabled.
• The port is disabled due to rapid ring faults (LNK2).
Flashing green Activity exists on the port.
Green One of these conditions exists:
• A link exists on the port, but no traffic is being received.
• The ring network is operating normally on active ring
supervisor (LNK2).
• A ring partial network fault was detected on the active ring
supervisor (LNK2).
Link Status
(LAN A, LAN B)
Flashing red When the corresponding LAN A/B Parallel Redundancy Protocol
(PRP) Warning bit is set.
Table 4 - Dual-port Module Status Indicators
Status Indicator Description Status State
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