Locate the (NCK) and turn it to position "1" (Standard Startup / Boot Mode). Turn on the machine control power.
The termination switches on the Profibus/MPI connectors at both ends of the cable run must be set to the ON position. Intermediate connectors must be set to OFF . If a resistor switch is loose or improperly set, signal reflections will corrupt data transmission. sinumerik 810d waiting for nck connection