Rockwell Automation Publication 1756-UM004D-EN-P - August 2022 65
Appendix A ControlLogix Network Device Status Indicators
Link Status
(L
INK 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.
SD
(1)
The SD indicator shows if the SD card is in use
Off
No activity is occurring with the SD card. You can safely remove
the card, if necessary.
Flashing green The module is reading from or writing to the SD card.
IMPORTANT: Do not remove the SD card while the module is
reading or writing. Let the read/write complete without
interruption. If you interrupt the read/write, data corruption or
loss can occur.
Solid green
Flashing red
One of the following exists:
• The SD card does not have a valid file system.
• The SD card drew excessive current and power has been
removed from the card.
Solid red The module does not recognize the SD card.
Parallel Redundancy
Protocol (PRP)
(1)
Check Firmware Revision for availability of this feature.
Redundant Adapter (RA)
(1)
Major revision 3.001 or higher.
(1) Status indicators only available on the 1756-EN4TR, 1756-EN4TRK, 1756-EN4TRXT.
Table 19 - Dual-port Module Status Indicators (Continued)
Status Indicator Description Status State
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