Replacing Functions By Subprograms; Overview - Siemens SINUMERIK 828D Function Manual

K1: Mode group, channel, program operation, reset response

9.15 Replacing functions by subprograms

9.15 Replacing functions by subprograms
9.15.1

Overview

Function
User-specific auxiliary functions (e.g. M101) do not trigger any system functions. They are only output to the NC/
PLC interface. The functionality of the auxiliary function must be implemented by the user/machine manufacturer
in the PLC user program. A description will be provided as to how a user-specific subprogram call can be
configured (replacement subprogram) instead of the output to NC/PLC interface, which is the default setting.
Function M101 is then still programmed in the part program. However, when executing the part program, the
substitute subprogram is called. Therefore, the NC replaces the function by a subprogram call. This results in the
following advantages:
• When adapting to the production process, an existing, tested and proven part program can still be used,
unchanged. The changes required are then shifted into the user-specific subroutines.
• The functionality can be implemented within the substitute subprogram with the full functional scope of the NC
language.
• The communication overhead between NC and PLC is not required.
Functions that can be replaced
The following functions can be replaced by subprograms:
Auxiliary functions
M Switching functions
T Tool selection
TCA Tool selection independent of the tool status
D Tool offset
DL Additive tool offset
Spindle-related functions during active synchronous spindle coupling
M40 Automatic gear stage change
M41 - M45 Gear stage selection 1 ... 5
SPOS Spindle positioning
SPOSA Spindle positioning
M19 Spindle positioning
636
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions