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Rockwell Automation DEVICENET 1771-SDN Manual de instalación Pagina 6

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If scanner goes bus off again, The problem is some combination of
Defective node •
•
•
•
•
•
•
•
•
•
•
Node baud rate
Bad topology
Bad connections
Bad scanner
Bad power
Bad grounding
Bad electrical noise
A Solid RED light at power-up means two nodes have the same address.
A Solid RED after allocation means bus off Check baud rate.
If the problems persist:
Replace T-Tap
Check topology
Check power for noise with oscilloscope or power disturbance analyzer
Finally if the problem remains after all else has been tried replace the node.
( Be sure to set the node address and baud rate on the replacement node, if applicable )
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