Please post your HMI screenshot with you said alarm 

and how this message happed? 

please explain : what is mean backup , what meaning for back up from USB flash.

such as normally we say: back up NC parameters from NCU memory to Hard disk in HMI or into USB storage. 

and if you NCU lost parameters you can restore from USB storage to the NCU ,

mahmoud_khalil22

Hi 

I have no nc ready on machine siemens 840d

I need step for backup from usb flash 

Can help me

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Split from "No NC Ready".