Siemens SINUMERIK 840D sl Programming Manual page 632

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Axis couplings

9.6 Master/slave group (MASLDEF, MASLDEL, MASLON, MASLOF, MASLOFS)

Further information

Dynamic configuration extension

For the slave axis, the actual value can be synchronized to the same value of the master

axis using PRESETON. To do this, the permanent/slave coupling must be briefly switched-out

in order to set the actual value of the non-referenced slave axis to the value of the

master/axis with power on. Then the coupling is permanently re-established.

The permanent master/slave coupling is activated using the MD setting

MD37262 $MA_MS_COUPLING_ALWAYS_ACTIVE = 1 – and this has no effect on the

language commands of the temporary coupling.

This instruction is executed directly for spindles in speed control mode.

The slave spindles rotating at this instant keep their speeds until a new

speed is programmed.

Definition of a master/slave group from the part program. Beforehand, the

definition was made exclusively using machine data.

The instruction cancels assignment of the slave axes to the master axis

and simultaneously opens the coupling, like MASLOF.

The master/slave definitions specified in the machine data are kept.

MASLOFS can be used to automatically brake slave spindles when the

coupling is opened.

For axes and spindles in the positioning mode, the coupling is only closed

and opened at standstill (zero speed).

Programming Manual, 06/2009, 6FC5398-2BP20-0BA0

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