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Is it possible to configure certain speed in ATV340 that will be applied to the motor when communication with control channel is lost?

It is possible to use fallback function. It is the speed at which motor will operate when communication is lost. 
How to configure it?
FOr modbus RTU - In fieldbus monitoring set SLL=fallback speed and LFF=xx Hz (fallback speed). 

Modbus timeout is set in parameter TTO

For embedded etherent (ATV340...E)
ETHL = fallback speed, LFF = xx Hz (fallback speed)

For other communication search in SOmove - Error / warning handling - Communication module

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