Siemens SINUMERIK 840D sl Programming Manual page 401

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Actual value and setpoint coupling

Setpoint coupling provides better synchronization of the leading and following axis than

actual value coupling and is therefore set by default.

Setpoint coupling is only possible if the leading and following axis are interpolated by the

same NCU. With an external leading axis, the following axis can only be coupled to the

leading axis via the actual values.

A switchover can be programmed via setting data $SA_LEAD_TYPE

You must always switch between the actual-value and setpoint coupling when the following

axis stops. It is only possible to resynchronize after switchover when the axis is motionless.

You cannot read the actual values without error during large machine vibrations. If you use

master value coupling in press transfer, it might be necessary to switchover from actual-

value coupling to setpoint coupling in the work steps with the greatest vibrations.

Master value simulation with setpoint coupling

Via machine data, you can disconnect the interpolator for the leading axis from the servo. In

this way you can generate setpoints for setpoint coupling without actually moving the leading

Master values generated from a setpoint link can be read from the following variables so that

they can be used, for example, in synchronized actions:

- $AA_LEAD_P

- $AA_LEAD_V

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Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

9.4 Axial leading value coupling (LEADON, LEADOF)

Master value position

Master value velocity

Path traversing behavior