Siemens SINUMERIK 840D sl Function Manual page 343

Coupling factor
The coupling factor must be programmed for each leading axis in the group. It is defined by
numerator/denominator.
Coupling factor values numerator and denominator are entered per leading axis with the
following activation calls:
EGON
EGONSYN
EGONSYNE
(see Chapter "Activating an EG axis group (Page 350)")
Number of EG axis groups
Several EG axis groups can be defined at the same time. The maximum possible number of
EG axis groupings is set in the following machine data:
MD11660 $MN_NUM_EG
The maximum permissible number of EG axis groups is 31.
Note
The option must be enabled.
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
M3: Coupled axes
8.4 Electronic gear (EG)
343