Siemens SINUMERIK 840D sl Function Manual page 146

B3: Several operator panels connected to several NCUs, distributed systems - only 840D sl
2.6 Link axes
Note
The axis container functions are described in the subsection "Axis container".
Figure 2-18
Explanation
Logical machine axis image A addresses local machine axes B and link axes C.
The number of local machine axes in B is limited. The maximum permissible number for a
specific system can be found in Catalog NC60.1.
All axes that can address the NCU are contained in B and C together.
Entries in A have the following format:
$MN_AXCONF_LOGIC_MACHAX_TAB[n] = NCj_AXimit
n: Index in Table A
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.
146
Assignment of channel axes to local machine axes and link axes
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions