
Publication DNET-UM004A-EN-P - March 2004
12-6 Troubleshoot a DeviceNet Network
Module Status indicator
Linking Activity status indicator
ControlNet Network (CNet A, CNet B) status indicators
If more than one state is present, the indicators always reflect the
highest priority status present on the network. Note that these
indicators do not reflect the status of the network access port (NAP).
State Description Recommended Action
off No power. Turn on power to the device.
flashing
green
The device is not configured and is in a standby state. Configure the device.
solid green Normal operation None.
solid red Device has an unrecoverable fault. 1. Cycle power to the device.
2. Replace the device
flashing
red
• Recoverable fault.
• DNet Data Rate or DNet Node Address switches are
set in the PGM range.
• Clear the fault.
• Change switch settings.
State Description
off No traffic
flashing
green
Traffic present (flash rate reflects amount of traffic)
flashing
red and
green
Module is running boot code only (reduced functionality code only for FLASH upgrading)
State Priority How to View Cause
both steady off 1
(highest)
View together Reset or no power
both steady red 2 Failed to link interface to ControlNet
alternating red &
green
3Self testing
alternating red 4 Bad node configuration (such as duplicate ControlNet network address)
steady off 5 View
independently
Channel disabled or not supported
flashing red & green 6 Invalid link configuration
flashing red 7 Link fault or no frames received
flashing green 8 Temporary channel error or listen only
steady green 9
(lowest)
Normal operation
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