Set Value Generators
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
Baumüller Nürnberg GmbH
426
4.6
4.6.5
Cam generator
A cam generator is integrated in the controller firmware. The cam generator reads a value
from a configured table (cam). The cam generator writes this value to a target parameter.
The cams are generated with the program ProCam and are loaded into the device with
ProDrive.
The cam generator supports the modes for table request
1
Time control via the table index
2
Time control with virtual master axis
3
Parameter controlled processing
The index of the cam is recalculated by the cam generator in the fieldbus task cycle. The
operation of the fieldbus task allows the use of "Synchronous set value setting". Here, the
set values are available in the fieldbus cycle. It is interpolated and extrapolated between
the single set values, in order to operate the closed loops, which are running quicker.
4.6.5.1 Time control via the table index
At time controlled processing, the table index is increased by one with each cycle.
4.6.5.2 Time control with virtual master axis
The index from the position of the virtual master axis
results, if it is controlled
via a virtual master axis. The speed is set via
. Interpolation between the single
cam supporting points can be processed in 256 steps. The following cam interpolation ta-
ble with the following supporting point count is generated:
The position of the virtual master axis is set, referring to the interpolation table. This
means, that the virtual master axis is positioned exactly on the supporting point with table
index
= 2 (whereat the table index starts with 0), if the virtual master axis posi-
tioning is specified with
= 512. The virtual master axis speed is set as a posi-
tioning change per cycle within the interpolation table. Therefore, the progress per cycle
on the interpolation table is exact one supporting point, if the virtual master axis speed is
256.
Processing time of the cam using the virtual master axis is calculated by:
NOTE!
According to application, the homing of the drive must be executed, before the cam
generator is started.
Count_Interpolation points
256 Count_Supporting points
=
Processing time
Count_Supporting points 256
Virtual master axis speed
-------------------------------------------------------------------------- Cycle time of field bus task
=
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