Coordinate Systems And Workpiece Machining - Siemens SINUMERIK 840DE Programming Manual

Fundamental Geometrical Principles

1.5 Coordinate systems and workpiece machining

• 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: /FB/ Function description B3, Multiple Operator Panels and NCUs
1.5 Coordinate systems and workpiece machining
The relationship between travel commands of the programmed axis movements from the
workpiece coordinates and the resulting machine movement is displayed.
How you can determine the distance traveled taking into account all shifts and corrections is
shown by reference to the path calculation.
Relationship between the travel commands from workpiece coordinates and the resulting machine
movements
Axis movement programmed in the workpiece coordinate system
1-30
link axis.
by NCUs other than its home NCU.
addressed alternately by different NCUs.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals