Siemens SINUMERIK 840D sl Function Manual page 250

M3: Coupled axes
5.4 Electronic gearbox (EG)
The maximum permissible number of EG axis groups is 31.
Note
The option must be enabled.
EG cascading
The following axis of an EG can be the leading axis of another EG. For a sample configuration
file, see Chapter "Examples".
Figure 5-7
Synchronous positions
To start up the EG axis group, an approach to defined positions for the following axis can first
be requested.
Synchronous positions are specified with:
EGONSYN (see below for details)
EGONSYNE (extended EGONSYN call).
Synchronization
If a gear is started with EGON(), EGONSYN() or EGONSYNE() see below, the actual position
of the following axis is only identical to the setpoint position defined by the rule of motion of
the gear specified by the positions of the leading axes at this time if the part program
developer makes sure that it is. The control then uses the motion of the following axis to
ensure that the setpoint and actual positions of the following axes correspond as quickly as
possible if the leading axes are moved further. This procedure is called synchronization. After
synchronization of the following axis, the term synchronous gearing is used.
250
Block diagram of an electronic gearbox
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions