Siemens SINUMERIK 840D sl Function Manual page 866

Synchronous Spindles (S3)
14.1 Brief description
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 parts program, PLC (FC18) or, also by means of
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 .
Coupling characteristics
The following characteristics can be defined for every synchronous spindle coupling:
● Block change behavior
866
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
The condition to be fulfilled for a block change can be defined on activation of
synchronous operation or on alteration of the ratio or the speed defined angular offset
when the coupling is active:
– Block change takes place immediately
– Block change in response to "Fine synchronism"
– Block change in response to "Coarse synchronism"
– Block change for IPOSTOP (i.e. after setpoint-end synchronism)
– Check of the synchronism conditions at an arbitrary moment with WAITC.
, Ü
numerator denominator
, Ü ,...). The values entered in the
numerator denominator
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
) is virtually unlimited
Extended Functions