66 Rockwell Automation Publication ENET-IN002H-EN-P - August 2017
Appendix A 1756 EtherNet/IP 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 inserted, snapped 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.
• One or more connections have timed out. For example, an
HMI or I/O connection has timed out.
Re-establish the connection.
Green The module has established at least one CIP™ connection and is
operating properly. The IP address of the module 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 current IP address of the
module 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 IP address of the module.
Flashing green/
flashing red
The module is performing its power-up testing.
LINK 1 (3)
LINK 2 (4)
Off One of these conditions exists:
• The module is not powered.
– Verify that there is chassis power.
– Verify that the module is inserted, snapped into the
chassis and backplane.
– Make sure the module has been configured.
• No link exists on the port.
• The port is administratively disabled (LNK2).
• 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.
• The ring network is operating normally on active ring
supervisor (LNK2).
• A ring partial network fault was detected on the active ring
supervisor (LNK2).
LAN A
LAN B
When using the 1756-EN2TP module, the
corresponding LAN A/B Parallel Redundancy Protocol
(PRP) Warning bit is set.
Flashing red 0 = Off
1 = On
Table 2 - Dual-port Module Status Indicators
Status Indicator Description Status State
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