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Is it possible to maintain the some speed, if the modbus cable is disconnected or broken from the Altivar 71 drive.

Yes, it is possible to maintain the some speed by the drive in case of the modbus cable is disconnected
or broken by below setting.
 
Program SLL [Modbus fault mgt] => [fallback spd] (LFF), it means Change to fallback speed, maintained
as long as the fault persists and the run command has not been removed.
For more detail, see attached file.
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