Rockwell Automation 1788-CNCHKR ControlNet NetChecker User Manual - Manual (Page 16)

16 ControlNet NetChecker
Rockwell Automation Publication 1788-UM001B-EN-P - August 2012
Illegal Framing
Illegal Framing has the following indications.
Illegal Framing occurs if short messages or short between-message gaps have been detected.
Illegal Framing detection is dependent on the threshold setting (SW3). Generally, recurrence
decreases as the threshold is made higher. This fault is often reported along with Poor Signal
Quality.
Illegal Framing most likely indicates a high level of signal reflections on the network (see
previous section), but can also be caused by a faulty node. A faulty node can be suspected in these
scenarios:
• Only Illegal Framing is reported.
• It is not affected by the threshold setting.
• The fault is reported everywhere on the network but the bargraph shows correct signal
levels.
In this case, try to identify the node with the Node Finder. Check the Node On Line status
indicator for each of the known addresses of your network. The faulty node is signalled by the
Node On Line status indicator turning red.
Slow Edges
Slow Edges has the following indications.
Status Indicator State
TRAFFIC Green
Slow Edges May also be blinking red
Illegal Framing Blinking red
Poor signal Quality May also be blinking red
Pass/Fail Yellow or red
Buzzer Sounds
Status Indicator State
TRAFFIC Green
Slow edges Blinking red
Illegal Framing May also be blinking red
Poor signal Quality May also be blinking red
Pass/Fail Yellow or red
Buzzer Sounds