Publication DNET-UM072C-EN-P - July 2004
5-2 Correct and Prevent Network Problems
Use Rockwell Automation’s Media Checker (catalog number
1788-MCHKR; available from your local Rockwell Automation
distributor) to test network problems that result from miswiring,
loose connections, opens or shorts.
Be careful when setting network addresses and baud rates.
Incorrectly set addresses or baud rates will cause other nodes to
appear to be bad.
Pressing the reset button on the scanner does not reset the network
Cycling power to the rack does not reset the network
Cycling network power could cause the scanner to go bus off. In
this state, nodes will not re-allocate, even if they are functioning
correctly.
If, after you replace a node that has gone bus off, the problem
persists, the problem is not the node itself. Rather, the problem
could be the address or baud rate setting, or a network topology,
grounding, or noise problem.
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