Output Of Predefined Auxiliary Functions In The Case Of An Ncu Link - Siemens SINUMERIK 840D sl Function Manual

Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.6 Link axes
2.6.3

Output of predefined auxiliary functions in the case of an NCU link

Predefined M, S, F auxiliary functions
For link axes and container link axes, a predefined M, S, and F auxiliary function is
transferred from the NCK via the NCU link to the home NCU of the link axes and output from
there as system auxiliary functions to the PLC. These system auxiliary functions are
evaluated by the PLC and output as follows:
DB31, ... DBW86 (M function (INT) for spindle)
DB31, ... DBD88 (S function (REAL) for spindle)
DB31, ... DBD78 (F function (REAL) for axis)
Note
The transfer from the NCU link to the home NCU is only relevant for predefined spindle
auxiliary functions M3, M4, M5, M19 and M70.
For more information about "Predefined auxiliary functions", see
References: /FB1/ Function Manual, Basic Functions; Auxiliary Functions to PLC (H2)
Alarm 14768
If the system auxiliary functions received via the NCU link cannot be output via the VDI
interface, because, for example, the transfer buffer is full, alarm 14768 "Cannot output axial
auxiliary functions received via NCU link" is issued.
Examples
An NC program with M3 S1000 is executed for the 7th channel on NCU_2. This spindle
corresponds to the 5th machine axis of NCU_1 and is therefore link axis. Therefore the
auxiliary function output here for NCU_2 is in Channel 7 with the axis number 0, as the link
axis is on another NCU (NCU_1 here). On the PLC of NCU_2, this results in the output of:
DB21, ... DBW68 (extended address of the M function (16-bit INT))
DB21, ... DBD70 (M function 1 (INT 3))
DB21, ... DBW98 (extended address of S function 1)
DB21, ... DBD100 (S function 1 (REAL 100))
In parallel, the information of the system auxiliary functions is transferred from NCU_2 via the
NCU link to NCU_1 (home NCU of the link axis). The system auxiliary functions M3 S1000
for the 5th machine axis are output from here.
The PLC on NCU_1 then supplies the following axial signals on the PLC user interface for
machine axis 5:
DB35, ... DBW86 (M function (INT 3) for spindle)
DB35, ... DBD88 (S function (REAL 100) for spindle).
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Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions