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What can cause an exception error when trying to connect Modbus TCP on the ATV600 / ATV900 process drives?

Unable to connect to ATV600 via Modbus TCP.  Getting "Exception Error" when trying to connect.

Product Line:
ATV600 / ATV900 series process drives.

All models, All serial numbers.

Unexpected fault condition.

Check that the Unit ID in your Generic Ethernet Module matches the Unit ID of the device you are trying to connect to.
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