Siemens sinumerik 840D sl Function Manual page 622

2.2.7 System response when a coupling is active
PLC signal: Traversing the slave axis
If a slave axis is traversed via the master axis when the coupling is active, the following PLC
signals are output depending on the travel state:
DB3x.DBB60.6
DB3x.DBB60.7
DB3x.DBB61.4
Since the coupling is processed in the position controller cycle, the travel command signals
are not output:
DB3x.DBB64.7 "Travel command +/-"
All other signals show the current state of the axis.
Actual value display
In the automatic basic display, the motion of the slave axis is not displayed for an active
coupling and the actual value is frozen. If the coupling is deactivated, the actual-value
display jumps to the current actual position. At the next NC start, the slave axis is
synchronized with the NC so that the slave axis can be traversed from this position.
The slave axis motion is always displayed, also at an active coupling, in the "Dialog" menu,
"Service display" softkey.
Traversing the slave axis
A slave axis in an active coupling must not be traversed by the part program, by the PLC or
manually in JOG mode. If a coupled slave axis is traversed, this produces the reset alarm
"75170 Axis AX1 overlaid motion not permissible".
Reference point approach
The status of the coupling determines the method of reference point approach. This applies
to referencing in JOG Ref mode, and referencing from within the part program (G74).
If a master-slave coupling can be activated via a PLC signal (DB3x,DBB24.7), the master
and slave axes are referenced individually in the "not active" coupling state.
If a master-slave coupling is always active after POWER ON (MD63590 = 1), only the master
axis is referenced. In this case, the slave axis is never referenced. Since the coupling is
active, the slave axis follows when the master axis is referenced.
MD34110 $MA_REFP_CYCLE_NR of the slave axis must be set to -1 so the NC can start up
without having to reference the slave axis.
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
2.2 Speed/torque coupling (up to SW 5.x)
"Exact stop fine"
"Exact stop coarse"
"Axis/spindle stationary"
Detailed description
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