Siemens SINUMERIK 840D sl Programming Manual page 429

Further information
Conditions
• The dependent NCUs, i.e., NCU1 to NCU<n> (n equals max. of 8), must be
interconnected via the link module for high-speed communication.
References:
Configuration Manual, NCU
• The axis must be configured appropriately via machine data.
• The "Link axis" option must be installed.
• The same interpolation cycle must be configured for all NCUs connected to the leading
link axis.
Restrictions
• A master axis which is a leading link axis cannot be a link axis, i.e. it cannot be traversed
by NCUs other than its home NCU.
• A master axis which is a leading link axis cannot be a container axis, i.e. it cannot be
addressed alternately by different NCUs.
• A leading link axis cannot be the programmed leading axis in a gantry grouping.
• Couplings with leading link axes cannot be cascaded.
• Axis replacement can only be implemented within the home NCU of the leading link axis.
System variables
The following system variables can be used in conjunction with the channel axis identifier of
the leading link axis:
System variables
$AA_LEAD_SP
$AA_LEAD_SV
If these system variables are updated by the home NCU of the master axis, the new values
are also transferred to any other NCUs, which wish to control slave axes as a function of this
master axis.
References:
Function Manual, Extended Functions; Multiple Operator Panels and NCUs (B3)
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Significance
Simulated master value - position
Simulated master value - velocity
Other information
15.1 Axes
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