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

Response of the AXIS-VAR server to errors
If the server cannot supply any values for an axis (e.g. because the axis concerned is a link
axis), then it returns a default value (generally 0).
For the purposes of testing, the machine data of the axis data servers below can be set to
sensitive, with the result that it returns an error message instead of default values:
MD11398 AXIS_VAR_SERVER_SENSITIVE
0: Default value
1: Error message
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.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Several Operator Panels on Several NCUs, Distributed Systems (B3)
Link axes
149