User manual

Maintenance
332
33002479 06 07/2008
Collision LED
Normal
Condition
If the Coll LED is flashing, the module is reporting collisions on the Ethernet
network. While such collisions are normal, the frequency of the flashes is an
indication of the volume of traffic on the network. The flashes may be so frequent
that the LED appears to be shining steadily. Heavy traffic will slow communications.
If response time is important to your application, you should consider segmenting
your network to reduce the frequency of collisions.
The following figure shows the Collision LED under normal conditions.
Run LED The following table describes the action to be taken if the Run LED is flashing. The
action depends on the number of flashes in sequence.
Application LED If the module crashes, it will note the reason in a log. If the module is able to recover,
the Appl LED will light, indicating that an entry has been made in the crash log. You
can read and clear the crash log (see Reading and Clearing the Crash Log, p. 333).
Ready
Link
Run Coll
ETHERNET TCP/IP
Active
140
NOE 771 xx
Number of Flashes in Sequence Action
Three Check Ethernet connection
Four Change IP address
Five Provide IP address
Six Connect using default IP address and configure
Seven Download a new NOE Exec (see Downloading a New
NOE Exec, p. 334)