Controlling Synchronous Spindle Coupling Via Plc - Siemens SINUMERIK 840D Function Manual

COUPOF during the motion
If synchronous mode is deselected while the spindles are in motion with COUPOF, the following
spindle continues to rotate at the current speed (n
system variable $AA_S in the NC parts program.
The following spindle can then be stopped from the parts program with M05, SPOS, SPOSA or
from the PLC with the appropriate interface signal.
COUPOFS with stop of following spindle
Opening a synchronous spindle coupling is extended by a stop of the following spindle:
● Deactivating a coupling as quickly as possible and opening a coupling as quickly as
possible.
The block change is then enabled.
COUPOFS(FS, LS)
● Opening the coupling with stop of following spindle at the programmed position. The block
change is then enabled.
Boundary condition:
COUPOFS(FS, LS) and COUPOFS(FS, LS, POS
19.1.6

Controlling synchronous spindle coupling via PLC

Controlling following spindle via PLC
Using the coupling-specific, axial VDI interface signals, it is possible to control synchronization
motions for the following spindle from the PLC program. This offers the option of utilizing the
PLC to disable, suppress or restore a synchronization motion for the following spindle specified
by offset programming.
These signals have no effect on the leading spindle. The following coupling-specific VDI signal
(PLC → NC) is available:
IS "Disable synchronization" (DB31, ... DBX31.5)
"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 part program instruction COUPON (FS, LS,
offset), the following interface signal is evaluated for the following spindle:
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S3: Synchronous spindle
19.1 Brief description
). The current speed can be read with
FS
) have no meaning if a coupling was active.
FS
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