Siemens SINUMERIK 840D sl Function Manual page 928

Synchronous Spindles (S3)
Special features of synchronous mode
Multiple couplings
If the system detects that a coupling is already active for an FS and LS when synchronous
mode is activated, then the activation process is ignored and an alarm message is
generated.
Example of multiple couplings:
● A spindle is acting as the FS for several LS.
● Coupling cascade
Number of configurable spindles per channel:
● Every axis in the channel can be configured as a spindle. The number of axes per
Cross-channel setpoint coupling and optional number of following spindles in optional
channels of an NCU:
● Cross-channel synchronous spindle couplings can be implemented with no additional
● Any number of following spindles, corresponding to the number of all spindles minus one
Start synchronous mode using ASUB
ASUBs (activation of asynchronous subprograms) processed by the PLC can be used to
activate or terminate synchronous mode at any chosen time in the AUTOMATIC or MDA
modes.
References:
/FB1/ Function Manual, Basic Functions, Mode Group, Channel, Program Operation, Reset
Response (K1)
Response to alarms
If alarms occur (e.g. servo alarms) during the synchronous operation, with which the servo
enable is cancelled internally in the control and follow-up is active, the subsequent response
is as if the IS "Servo enable" (DB31, ... DBX2.1) had been removed by the PLC (and IS
"Follow-up mode" (DB31, ... DBX1.4) is set), see Section "Influence on synchronous
operation via PLC interface".
IS "Re-synchronization" (DB31, ... DBX31.4) can be used to reproduce the programmed
offset, see Section "Reproduce synchronism of following spindle".
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channel depends on the control version.
restrictions for DV, AV, and VV.
spindle for the master, in any channels on an NCU can be coupled to one leading
spindle. The real time CPU time needed may possibly also impact on the number of
following spindles.
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions