Lead Link Axes - Siemens SINUMERIK 840D sl Programming Manual

Other information
15.1 Axes
15.1.12

Lead link axes

A leading link axis is one that is interpolated by one NCU and utilized by one or several other
NCUs as the master axis for controlling slave axes.
An axial position controller alarm is sent to all other NCUs, which are connected to the
affected axis via a leading link axis.
NCUs that are dependent on the leading link axis can utilize the following coupling
relationships with it:
• Master value (setpoint, actual master value, simulated master value)
• Coupled motion
• Tangential correction
• Electronic gear (ELG)
• Synchronous spindle
Programming
Master NCU:
Only the NCU, which is physically assigned to the master value axis can program travel
motions for this axis. The travel program must not contain any special functions or operations.
NCUs of slave axes:
The travel program on the NCUs of the slave axes must not contain any travel commands for
the leading link axis (master value axis). Any violation of this rule triggers an alarm.
The leading link axis is addressed in the usual way via channel axis identifiers. The states of
the leading link axis can be accessed by means of selected system variables.
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals