Node problems, Device failure - indicator status check – Rockwell Automation 2090 Ultra3000 Servo Drives Integration Manual User Manual

Page 110

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Publication 2098-IN005C-EN-P — March 2008

110

Troubleshooting Your Ultra3000 Servo Drive

Node Problems

Give particular attention to the task of setting initial addresses and
data rates. Survey the network to ensure all assignments are known.
Some nodes can be logically assigned to a group of devices, but
physically located away from those devices. One incorrect node can
cause other nodes to appear to be bus-off (steady-red indicator). If a
node goes bus-off and the device is reset only to go bus-off again, the
problem is likely not with the device, but rather the setting of the
address, data rate, or a network-wide problem related to topology,
grounding, intermittent power/data connections, or electrical noise. If
a scanner goes bus-off, nodes will not reallocate (Flashing-green or
red) even if they are functioning correctly.

Device Failure - Indicator Status Check

A steady-red Module Status indicator can mean an error. If the
Network Status indicator goes steady-red at power-up, it could mean
there is a Duplicate MAC ID. The user response is to test all devices
for unique addresses. If a steady-red indicator remains on after the
Duplicate MAC ID test shows all devices to have a unique node
address, it means a bus-off error.

Follow these steps to resolve the error.

1. Check data rate settings.

2. If symptom persists, replace node address (with another address

and correct data rate).

3. If symptom persists, replace tee tap.

4. If symptom persists, check topology.

5. If symptom persists, check power for noise with oscilloscope or

power disturbance analyzer.

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