Siemens SINUMERIK 840D sl Function Manual page 148

Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.6 Link axes
Powering up an NCU grouping
If one NCU in the grouping is restarted, e.g. due to changes to machine data, then the other
NCUs in the grouping also execute a warm restart.
Nibbling and punching
To execute nibbling and punching operations, high-speed inputs and outputs must be
connected and parameterized on the "interpolation" NCU (on which the part program is
being executed). Commands "High-speed nibbling and punching", e.g. PONS and SONS are
not available for link axes.
Travel to fixed endstop
If an axis container axis is being held against a fixed stop, the axis container cannot rotate.
Axes can travel to fixed stops on different NCUs and be subsequently clamped without
restriction.
Frames
Link axes may be included in the program commands for frames only if they are geometry
axes as well. The command only changes the geometry for the channel in which the axis is
currently assigned. A frame command for an axis which is not defined as a geometry axis is
rejected with alarm 14092.
Rev. feedrate
Setting data SD43300 SA_ASSIGN_FEED_PER_REV_SOURCE refers to the logical
machine axis image and then via this to a machine axis (local or link axis).
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Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions