Replacing Functions By Subprograms; Overview - Siemens SINUMERIK 840D sl Function Manual

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Replacing functions by subprograms

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

subprograms.

● 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

Spindle-related functions during active synchronous spindle coupling

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

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

Switching functions

Tool selection

Tool selection independent of the tool status

Additive tool offset

Automatic gear stage change

Gear stage selection 1 ... 5

Spindle positioning

9.17 Replacing functions by subprograms

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