Siemens sinumerik 840D sl Function Manual page 621

Detailed description
2.2 Speed/torque coupling (up to SW 5.x)
Activating and deactivating a master-slave coupling via PLC signal
A coupling is activated or deactivated via an axis-specific PLC signal "to axis". Only the
signal to the slave axis is relevant here. The signal resides in the technologies area.
DB3x.DBB24.7
If one of the conditions for activation or deactivation is not satisfied, the slave axis does not
react to the PLC signal, i.e. the status of the coupling remains unchanged. No NC alarm is
output.
Example:
• A part program is processed in channel 1, channel state: "active".
• A master-slave coupling is active, master axis and slave axis are in channel 1, PLC signal
• The coupling is to be deactivated, PLC sets DB3x.DBB24.7 = 0.
• Since the channel is not in the "RESET" state, the coupling is not deactivated.
• The coupling is not deactivated until the part program is terminated with M30 or RESET.
Figure 2-15
PLC signal: State of a master/slave coupling
The status of a master-slave coupling is displayed in an axis-specific VDI signal "from axis".
The machine data of the slave axis are always relevant for a coupling. This signal is set
irrespective of whether the coupling is always active (MD63590) or has been activated via
the PLC (DB3x.DBB24.7).
DB3x.DBB96.7
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to slave axis DB3x.DBB24.7 = 1.
Deactivating a coupling
"Activate master-slave coupling"
1 = Activate master-slave coupling
0 = Deactivate master-slave coupling
"State of master-slave coupling"
1 = Master-slave coupling active
0 = Master-slave coupling not active
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0