Siemens SINUMERIK 840D sl Function Manual page 883

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
2. Activation of coupling with a defined angular offset POS
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
movement at the angular offset programmed with POS
"Superimposed movement" (DB31, ... DBX98.4) is set.
Angular offset POS
FS
The defined angular offset POS
zero degrees position of the leading spindle in a positive direction of rotation.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
following spindles.
COUPON(FS, LS)
spindle. With this method, the angular offset must be programmed on selection.
COUPON(FS, LS, POS
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.
)
FS
must be specified as an absolute position referred to the
FS
S3: Synchronous spindle
14.1 Brief description
between leading and following
FS
. During this time, the IS
FS
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