Your machine using SINUMERIK 840D Solution line,

Please use open a new topic:

"SINUMERIK 840D Solution line Alarm 120202 on the HMI"

post the picture and giving alarm text "120202 Communication to NCK failure ?????"

and let the forum know your machine story--such as you have 2nd hand machine? or you have long time not power the machine, lost all parameters due to a dead battery. or somethings

Give more information as you can.

VK00

120202 error on DMG SINUMERIK 840D Please help

VK00

Please help!!

Hello,

Please create new topic instead of posting your query in old topic & also provide brief information about your issue, e.g. is it new machine under commissioning or running machine, how this problem trigered? did you changed/modified any setting/parameter etc. etc. . 

Yours is 840D Sl system.from the attached snap, system booting & NC is in cyclic operation is ok. It had been more helpful if you would have attached the snap shot of complete message displayed on OP. Please check if you have TCU or PCU. 120202 alarm specifies communication between NC/PLC is interrupted. So please check ethernet cable, connection between 840D NCU & TCU/PCU, check IP address.

HTH