Siemens SINUMERIK 840D sl Function Manual page 200

Several Operator Panels on Several NCUs, Distributed Systems (B3)
Supplementary conditions
2.14.6 NCU link with different interpolation cycles
Availability
NCU link with different interpolation cycles is an option.
All requirements that apply for link axes must be fulfilled.
If the non-local axes - seen from the point of view of the NCU with the fast interpolation cycle -
are container axes (e.g. with multi-spindle turning machines) the corresponding option must
also be installed.
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Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions