Siemens sinumerik 840D sl Function Manual page 600

2.1.6 Activating a coupling
The type of activation for a master-slave coupling is defined in the following machine data:
MD37262 $MA_MS_COUPLING_ALWAYS_ACTIVE
Depending on the machine configuration, a distinction is made between a permanent and a
temporary master-slave coupling.
Only a temporary master-slave coupling that is configured via machine data (MD37262
$MA_MS_COUPLING_ALWAYS_ACTIVE = 0), can be closed and disconnected using the
axial PLC interface signal "Master/Slave ON" (DB31, ... DBX24.7) or within a part program
using the following commands:
MASLON(slave axis1, slave axis2, ...)
MASLOF(slave axis1, slave axis2, ...)
The setpoint status of the coupling always corresponds to the last specification made.
The current coupling status can be read back in the slave axis via PLC interface signal
"Master/slave coupling active" (DB31, ... DBX96.7).
In the part program and from the synchronized actions, the current coupling status can be
output via the system variable of the slave axis $AA_MASL_STAT.
SW 6.4 and higher
The instruction MASLOFS(Slv1, Slv2, ...) can be used too disconnect the coupling in the
same way as MASLOF and decelerate the slave spindle automatically.
Note
A permanent coupling (MD37262 $MA_MS_COUPLING_ALWAYS_ACTIVE = 1) does not
require explicit activation.
For more information about how on a permanent master-slave coupling for the slave axis,
PresetOn can be used to synchronize the actual value to the same value as the master axis,
see:
References:
/PGA/Programming Manual, Scheduling, Chapter "Master/Slave Combination"
Example
For an example of how to configure the master-slave coupling between AX1=master and
AX2=slave, please see Chapter "Examples", "Speed/torque Coupling"
Special functions: Speed/Torque Coupling, Master-Slave (TE3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
2.1 Speed/torque coupling, master-slave (SW 6 and higher)
Detailed description
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