Siemens SINUMERIK 840D sl Function Manual page 392

K3: Compensation
5.4 Interpolatory compensation
NOTICE
YY is coupled to XX with each container rotation, there is a different axis behind YY now:
YY "AX5 of NCU-1" is in configuration 3.
Other real axes are coupled after the rotation in this way: In this example, AX-5 of NCU-1 is
coupled to AX-2 of NCU-1.
As a rule:
The coupling is created between two axes from the LAI layer so that other axes participate in
the coupling after each axis container rotation. A new table must be activated for each
container rotation to undertake a coupling exactly between two real axes.
Configuration example
The following figures (Configuration 1, Configuration 2 and Configuration 3) illustrate the axis
configurations of an NCU link that is assembled from two NCUs.
The two channels CHAN-1 and CHAN-2 of NCU-1 are displayed in Configuration 1. Here,
the channel axis names that are defined via the machine data
$MC_AXCONF_CHANAX_NAME_TAB are entered. The channel configuration of the second
NCU is not displayed.
All the axes interpolated by this NCU are compiled in the "Logical NCK machine axis image"
(LAI layer). The assignment between channel and MCS axis layer is done via
$MC_AXCONF_MACHAX_USED.
The assignment between the "Logical NCK machine axis image" and the real axes is
undertaken via the machine data $MN_AXCONF_LOGICMACHAX_TAB. If ones pursues the
connecting line that starts with channel axis ZZ, one ends at Axis AX2 on NCU-2, i.e., to
traverse the 2nd axis of NCU 2, the following instruction must be programmed in the 2nd
channel of NCU 1: "N2040 POS[ZZ]=10 FA[ZZ]=1000"
Configuration 2 and Configuration 3 extend the figure of Configuration 1 by one axis
container (CT1) that is set with machine data $MN_AXCT_AXCONF_ASSIGN_TAB1. The
axis container is an overlapping object, i.e., each axis container exists only once for the
whole NCU cluster.
For NCU 1, the participants in the axis container are channel axes YR and YY; the two
channel axes from NCU2 are not displayed. The container contains the real axes NC1_AX5,
NC1_AX6, NC2_AX1 and NC2_AX2. Container YR connects with NC2_AX1 and YY
connects with NC2_AX2 during the ramp up. In Configuration 3, the container has rotated,
i.e., the connection structure has changed. YR is now connected to NC2_AX2 and YY is
connected to NC1_AX5.
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Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions