Siemens SINUMERIK 840C Installation Instructions Manual page 241

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.4 Axis-specific MD 1 (axial data 1)
364*
Default value
1
368*
v: Variable increment weighting traversing path
Default value
2
The pulses coming from the digital measuring system and the position control resolution must
be coordinated in order to produce a correctly closed position control loop.
NC machine data 364* and 368* can be used for this purpose.
The number of pulses of the encoder and the appropriate distance to go on the machine must
be known for determining machine data 364* and 368* .
The following formula represents the relation between these machine data:
Position control resolution × MD 368* = Measuring system resolution × MD 364*
Schematic block diagram of the position control parameters :
Meas. Mech.
system gearing
Meas. system resolution
Note concerning upper input limits
MD 364* and MD 368* should always be reduced as much as possible (at least for values
100 000).
Note: as from SW 4
MD 3900* 3904* and 3908* in the MDD are used to automatically calculate MD 364*.
6–56
u: Variable increment weighting pulses
Lower input limit Upper input limit
65 000 (SW 1)
1
9999 9999 (as from SW 2)
Lower input limit Upper input limit
65 000 (SW 1)
1
9999 9999 (as from SW 2)
Multipl. Dist. to go
of pulses Pulse eval.
Hardware MD 368*
Actual value adjustment
©
Siemens AG 1992 All Rights Reserved
Active on
Power On
Units
–
Active on
Power On
Units
–
Pulses Pos. control
Pulse eval. = resolution
MD 364* MD 1800*
Comput. resoln.
=
6FC5197- AA50
SINUMERIK 840C (IA)
09.95