
ControlNet-to-DeviceNet Linking Device
29
1788-5.2B - October 1999
ControlNet Network Status LEDs (CNet A, CNet B)
The ControlNet Network Status LEDs indicate the state of the ControlNet
network connected to the BNC connectors. If more than one state is present, the
LEDs always reflect the highest priority status present on the network. Note that
these LEDs do not reflect the status of the network access port (NAP). Table C
describes the LED states and the priority of each status LED.
DeviceNet Network Status LED
The DeviceNet Network Status LED indicates the functional states of the DNet
port. Table D describes each state.
Table C Description of ControlNet Network Status LED States
LED 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
3
Self 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
Table D Description of DeviceNet Network Status LED States
LED State
Meaning
Off
DeviceNet port not receiving packets
Steady green
DeviceNet port is alive
Flashing red and green
DeviceNet port is seeing traffic, but is at a default or visitor address
Flashing red
DeviceNet port encountered transient, non-fatal network error
Steady red
DeviceNet port encountered fatal network error
Allen-Bradley Parts