Siemens SINUMERIK 840D sl Function Manual page 887

"Disable synchronization"
The synchronization motion for the following spindle is suppressed using the axial signal IS
"Disable synchronization" (DB31, ... DBX31.5).
When the main run advances to a block containing parts program statement COUPON (FS,
LS, offset), the following interface signal is evaluated for the following spindle:
IS "Disable synchronization" (DB31, ... DBX31.5).
● For IS "Disable synchronization" (DB31, ... DBX31.5) = 0, the position offset is traversed
through as before.
● For IS "Disable synchronization" (DB31, ... DBX31.5) = 1, only the continuous velocity
synchronism is established. The following spindle does not execute any additional
movement.
The coupling then responds analogously to a programmed COUPON(<FS>,<LS>).
Special features
For the IS "Disable synchronization" (DB31, ... DBX31.5) offset motion of the following
spindle cannot be controlled that was generated as follows:
● SPOS, POS
● Synchronized actions
● FC18 (for 840D sl)
● JOG
These functions are controlled by VDI signal IS "Feedrate stop/Spindle stop" (DB31, ... DBX4.3).
Synchronized state reached
Whenever a state of synchronism has been reached, the following two VDI signals are set
regardless of whether synchronization has been disabled or not:
IS "Synchronism coarse" (DB31, ... DBX98.1) and
IS "Synchronism fine" (DB31, ... DBX98.0)
Further block changes after COUPON are not prevented by suppression of synchronization.
Example
Block change behavior after COUPON
N51 SPOS=10 SPOS[2]=10
N52 COUPDEF(S2,S1,1,1,"FINE","DV")
N53 COUPON(S2,S1,77)
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
S3: Synchronous spindle
; IS "Disable synchronization"
; set (DB31, ... DBX31.5) = 1 for S2
; Positions correspond to an offset
of 0°
; Actual offset of 0 degrees is retained
; no following spindle movement,
; VDI signals
14.1 Brief description
887