Siemens SINUMERIK 840D sl Function Manual page 878

S3: Synchronous spindle
14.1 Brief description
Definition of synchronous spindles
Before synchronous operation is activated, the spindles to be coupled (FS, LS) must be
defined.
This can be done in two ways depending on the application in question:
1. Permanently configured coupling:
2. User-defined coupling:
IS "Following spindle active" (DB31, ... DBX99.1) and IS "Leading spindle active" (DB31, ...
DBX99.0) indicate to the PLC for each machine axis whether the axis is active as a leading
or following spindle.
The LS can be programmed either via a part program, PLC or also using synchronized actions.
Speed ratio
The speed ratio is programmed with separate numerical values for numerator and
denominator (speed ratio parameters). It is therefore possible to specify the speed ratio very
exactly, even with rational numbers.
In general:
k = speed ratio parameter for numerator : Speed ratio parameters for denominator =
Ü
Ü
numerator
The value range of the speed ratio parameter (Ü
internally in the control.
The speed ratio parameters for the coupling configured via machine data can be defined in
channel-specific SD 42300: COUPLE_RATIO_1[n]. In addition, the ratio can be altered with
language instruction COUPDEF(FS, LS, Ü
setting data are not overwritten in this case (default settings).
The ratio for the coupling defined via the NC parts program can only be input with language
instruction COUPDEF (...).
The new speed ratio parameters take effect as soon as the COUPDEF instruction has been
processed.
For further programming instructions for synchronous spindle couplings, please see
"Programming of synchronous spindle couplings" Section.
878
Machine axes that are to function as the following spindle (FS) and leading spindle (LS)
are defined in channel-specific MD 21300 $MC_COUPLE_AXIS_1[n].
The machine axes programmed as the LS and FS for this coupling configuration cannot
be altered by the NC parts program.
If necessary, the coupling parameters can be modified with the NC parts program.
Couplings can be created and altered in the NC parts program with language instruction
"COUPDEF(FS, LS, ...)". If a new coupling relationship is to be defined, it may be
necessary to delete an existing user-defined coupling beforehand (with language
instruction COUPDEL(FS, LS)).
The axis identifiers (Sn, SPI(n)) for the following and leading spindles must be
programmed with FS and LS for every language instruction COUP..., thus ensuring that
the synchronous spindle coupling is unambiguously defined.
The valid spindle number must then be assigned axis-specific machine data of a machine
axis:
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX.
: Ü
denominator
, Ü
numerator denominator
, Ü ,...). The values entered in the
numerator denominator
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
) is virtually unlimited
Extended Functions