Siemens SINUMERIK 840D sl Programming Manual page 427

The link communication must provide the means of interaction between the interpolators and
the position controller or PLC interface. The setpoints calculated by the interpolators must be
transported to the position control loop on the home NCU and, vice versa, the actual values
must be returned from there back to the interpolators.
References:
For more detailed information about link axes see:
Function Manual, Advanced Functions; Multiple Operator Panels and NCUs (B3)
Axis container
An axis container is a circular buffer data structure, in which local axes and/or link axes are
assigned to channels. The entries in the circular buffer can be shifted cyclically.
In addition to the direct reference to local axes or link axes, the link axis configuration in the
logical machine axis image also allows references to axis containers. This type of reference
consists of:
• A container number and
• a slot (circular buffer location within the container)
The entry in a circular buffer location contains:
• a local axis or
• a link axis
Axis container entries contain local machine axes or link axes from the perspective of an
individual NCU. The entries in the logical machine axis image
(MD10002 $MN_AXCONF_LOGIC_MACHAX_TAB) of an individual NCU are fixed.
References:
The axis container function is described in:
Function Manual, Advanced Functions; Multiple Operator Panels and NCUs (B3)
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Other information
15.1 Axes
427