Siemens SINUMERIK 840D sl Function Manual page 911

Special points to be noted
IS "Disable synchronization" (DB31, ... DBX31.5) can be used to no control offset
movements of the following spindle which were created as follows:
● SPOS, POS
● Synchronized actions
● FC18
● 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)
N54 M0
N57 COUPOF(S2,S1)
N99 M30
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Synchronous Spindles (S3)
; 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
; IS "Synchronism coarse"
; Set (DB31, ... DBX98.1) and
; IS "Synchronism fine"
; Set (DB31, ... DBX98.0)
; are set and the block change
; is enabled.
Brief description
911