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VFD ABB 880 Mode bus communication issue

Hi Gents,

We face a problem on VFD 880, Mode bus communication drop while start the VFD.
seven VFD connected with Mode bus communication with Allen Bradley PLC.
Mode bus used to monitor only energy (Voltage, Current, Power).

Note: No any alarm on face plate of VFD ..Alarm appear on PLC

Please advice how to figured out.

Regards.

Imran Javed,