Siemens SINUMERIK 840D sl Function Manual page 907

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
part 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.
The "0° position" of a position-controlled spindle is calculated as follows:
● from the zero mark or Bero signal of the measurement system and
● from the reference values saved using axis-specific machine data:
Range of POS
References:
/FB1/ Function Manual, Basic Functions; Reference Point Approach (R1)
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
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.
MD34100 $MA_REFP_SET_POS, reference point value,
of no significance with interval-coded systems.
MD34080 $MA_REFP_MOVE_DIST reference point distance/target point
with interval-coded systems,
MD34090 $MA_REFP_MOVE_DIST_CORR reference point offset/absolute offset with
interval coding.
: 0 ... 359.999°.
FS
must be specified as an absolute position referred to the
FS
Synchronous Spindles (S3)
Brief description
. During this time, the IS
FS
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