Rockwell Automation Publication 1756-UM004C-EN-P - June 2021 47
Appendix A ControlLogix Network Device Status Indicators
Figure 18 - 1756-EWEB (Single-port Module)
Single-Port Module Status Indicators
Link Status Indicator
(LINK)
Network Status Indicator (NET)
OK Status Indicator
Module Status Display
Table 7 - Single-port Module Status Indicators
Status Indicator Description Status State
Module Status Display
Alphanumeric display that scrolls messages. For example,
when a module is operating normally, the display scrolls the
module’s IP address.
——
Link Status (LINK)
Indicates the current state of the module regarding
transmission of data on the EtherNet/IP™ network.
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.
Flashing green Activity exists on the port.
Green The port is active, but not receiving traffic.
OK Status (OK)
Indicates the current state of the module. For example, this
status indicator indicates if the module is executing power-
up testing, in the process of a firmware update or operating
normally.
Off
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.
Flashing green
The module is not configured. The Module Status
display scrolls: BOOTP or
DHCP<Mac_address_of_module>
For example: BOOTP 00:0b:db:14:55:35
Configure the module.
Green
The module is operating correctly. The IP address
scrolls across the Module Status display.
Flashing red
The module detected a recoverable minor fault. Check
the module configuration. If necessary, reconfigure the
module.
Red
The module detected an unrecoverable major fault.
Cycle power to the module. If this power cycle does not
clear the fault, replace the module.
Network Status (NET) Indicates if CIP™ connections are established.
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.
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