Userdefined Auxiliary Functions - Siemens SINUMERIK 840D sl Function Manual

H2: Auxiliary function outputs to PLC

8.3 Userdefined auxiliary functions

8.3 Userdefined auxiliary functions
There are two uses for user-defined auxiliary functions:
● Extension of predefined auxiliary functions
● User-specific auxiliary functions
Extension of predefined auxiliary functions
Because there is only one set of machine data for the predefined auxiliary functions, they can
only ever be used to address one spindle of the channel. To address further spindles, user-
defined auxiliary functions must be parameterized to supplement the predefined auxiliary
functions.
Extension of predefined auxiliary functions refers to the "address extensions" parameter. The
number of the spindle that the auxiliary function refers to is entered in the "address extension"
parameter.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions