Siemens SINUMERIK 840Di sl Programming Manual page 43

Prerequisites
• The dependent NCUs, i.e., NCU1 to NCUn (n equals max. of 8), must be interconnected
• The axis must be configured appropriately by machine data.
• The link axis option must be installed.
• The same interpolation cycle must be configured for all NCUs connected to the leading
Restrictions
• A master axis, which is leading link axis cannot be a link axis, i.e., it cannot be operated
• A master axis, which is leading link axis cannot be a container axis, i.e., it cannot be
• 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:
• $AA_LEAD_SP; Simulated master value position
• SAA_LEAD_SV; Simulated master value velocity
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: /FB2/Function Manual Extended Functions; Multiple Operator Panels and
NCUs (B3)
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
via the link module for high-speed communication.
References:
/PHD/Configuring Manual NCU; NCU 571-573.2 Link Module
link axis.
by NCUs other than its home NCU.
addressed alternately by different NCUs.
Fundamental Geometrical Principles
1.4 Axes
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