Siemens SINUMERIK 840D sl Function Manual page 146

Several Operator Panels on Several NCUs, Distributed Systems (B3)
Link axes
NC: stands for NCU with
j: NCU number, 1 <= j <= 16
i: Axis number, 1 <= i <= 31
Channel axes are assigned to logical machine axis image A via machine data:
MD20070 $MC_AXCONF_MACHAX_USED
Viewed from the part program, the only accessible machine axes are those which can be
addressed by the channel (possibly via axis container, see below) via the logical machine
axis image at a given point in time.
Default
By default, the settings of logical machine axis image A are local axis name AX1 for entry 1,
and local axis name AX2 for entry 2, etc.
Examples
The following expressions can appear in the logical machine axis image, for example:
NC2_AX7: Machine axis 7 of NCU 2
AX2: Local machine axis 2
If expressions exclusively of the form AXi above are entered in the logical machine axis
image, a configuration is produced which only allows local axes to be addressed.
Notice: The defaults are as follows:
MD10002 $MN_AXCONF_LOGIC_MACHAX_TAB[0] = AX1
MD10002 $MN_AXCONF_LOGIC_MACHAX_TAB[1] = AX2
...
Note
Another valid format for entries in the logical machine axis image A is:
MD10002 $MN_AXCONF_LOGIC_MACHAX_TAB[n] = CTx_SLy where
CT: stands for container
x: Container number, 1 <= x <= 16
SL: stands for slot
y: Slot number, 1 <= y <= 32
Axis containers are an arrangement of axes in groups which can be changed dynamically.
Axis containers are described in Section "Axis container".
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Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions