Siemens SINUMERIK 840D sl Function Manual page 931

14.4.3 Influence on synchronous operation via PLC interface
PLC interface signals
In synchronous operation, the influence of the PLC on the coupling resulting from the setting
of LS and FS interface signals must be noted.
The effect of the main PLC interface signals on the synchronous spindle coupling is
described below.
Spindle override (DB31, ... DBB19)
The spindle override value specified by the PLC in synchronous operation is only applied to
the leading spindle.
Axis/spindle disable (DB31, ... DBX1.3)
The behavior of the axes involved can be found in the following table:
set: 1, disabled: 0
No.
1
2
3
4
5
6
7
8
● This signal is no longer effective when the coupling for FS/FA is activated. → No. 6
● If the signal for the LS/LA is set, it also applies to the FS/FA(s) → No. 7
● A workpiece clamped between two spindles (workpiece transfer from front to rear-side
Servo enable (DB31, ... DBX2.1)
Cancellation of "Servo enable" for LS (either via PLC interface or internally in the control in
the event of faults):
If the servo enable signal of the LS is set to "0" during synchronous operation and a setpoint
coupling is active, a switchover to actual-value coupling is executed in the control. If the LS
is in motion at this instant, it is decelerated to a standstill and an alarm message is
generated. Synchronous operation remains active.
Cancellation of "Servo enable" for FS in synchronous operation (either via PLC interface or
internally in the control in the event of faults):
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
LS/LA FS/FA coupling
0 0 OFF
0 1 OFF
1 0 OFF
1 1 OFF
0 0 ON
0 1 ON
1 0 ON
1 1 ON
machining) cannot be destroyed.
Special features of synchronous mode
Response
Setpoints of axes are output
No setpoint output for FS/FA
No setpoint output for LS/LA
No setpoint output for LS/LA and FS/FA
Setpoints of axes are output
Disable not effective for FS/FA
Disable also effective for FS/FA, no setpoint output
No setpoint output for LS/LA and FS/FA
Synchronous Spindles (S3)
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