Synchronous Mode - Siemens SINUMERIK 840D Function Manual

Figure 19-2
19.1.2

Synchronous mode

Description
<axial expression>:
<Axis name>:
<spindle name>:
<Spindle number>:
(FS, LS, offset):
$P_COUP_OFFS[Sn]
Synchronous spindle pair
Synchronous operation involves a following spindle (FS) and a leading spindle (LS), referred to
as the synchronous spindle pair. The following spindle imitates the movements of the leading
spindle when a coupling is active (synchronous operation) in accordance with the defined
functional interrelationship.
Synchronous mode
Synchronous mode (also referred to as "Synchronous spindle operation") is another spindle
operating mode. Before synchronous mode is activated, the following (slave) spindle must
have been switched to position control. Synchronous operation is activated for the following
spindle when the coupling is activated. As soon as the coupling is deactivated, the following
spindle switches back to open-loop control mode.
As soon as synchronous operation is active for the following spindle, the following interface
signal is reported to the PLC:
IS "Synchronous mode" (DB31, ... DBX84.4) = 1.
Number of synchronous spindles
It is possible to couple several following spindles to one leading spindle. The number of
following spindles on this leading spindle depends on the respective version of the appropriate
software versions.
Any number of following spindles in any channels of one NCU or a different NCU can be
coupled to this leading spindle.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Synchronous operation: Polygonal turning
S3: Synchronous spindle
can be:
- Axis name
- Spindle name
C (if spindle has the name "C" in axis operation.)
Sn, SPI(n) where n = spindle number
1, 2, ... according to the spindle number defined in
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX
LS = Leading Spindle, FS = Following Spindle,
Offset = read programmable offset of following
spindle using system variables
Programmed position offset of the synchronous
spindle
19.1 Brief description
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