Selecting The Parts Program's Synchronous Mode - Siemens SINUMERIK 840D sl Function Manual

Synchronous Spindles (S3)
14.1 Brief description
14.1.5

Selecting the parts program's synchronous mode

Activate coupling COUPON, COUPONC
Language instruction COUPON activates the coupling in the parts program between the
programmed spindles with the last valid parameters and thus also activates synchronous
mode. This coupling may be a fixed configuration or user-defined. The leading spindle and/or
following spindle may be at standstill or in motion at the instant of activation.
Certain conditions must be fulfilled before synchronous operation can be activated, see
Section "Prerequisites for synchronous mode".
The COUPONC statement adopts the previous programmed direction of spindle rotation and
spindle speed for the following and leading spindle in the parts program. It is not possible to
specify an angular offset.
COUPON activation variants
Two different methods can be selected to activate synchronous mode:
1. Fastest possible activation of coupling with any angular reference between leading and
following spindles.
2. Activation of coupling with a defined angular offset POS
spindle. With this method, the angular offset must be programmed on selection.
Note
If the LS and/or FS is in axis mode before switching on the synchronous coupling, the
axis mode is left and spindle mode is activated with use of the spindle identifier.
If the spindle is switched on with use of the axis identifier, no changeover takes place.
Block change behavior
Before synchronous operation is selected, it must be determined under what conditions the
block change must occur when synchronous mode is activated, see Section "Preparatory
programming instructions".
Determining current coupling status
It is possible to determine the current coupling status for the specified axis/spindle in the NC
parts program by means of axial system variable $AA_COUP_ACT[<axial expression>], see
Section "Axial system variables for synchronous spindles". As soon as the synchronous
spindle coupling is active for the following spindle, bit 2 must be "1" when read.
Change defined angular offset
Language instructions COUPON and SPOS allow the defined angular offset to be changed
while synchronous mode is active. The following spindle is positioned as an overlaid
870
COUPON(FS, LS)
COUPON(FS, LS, POS )
FS
between leading and following
FS
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions