Cam Generator; Time Control Via The Table Index; Time Control With Virtual Master Axis - Baumuller b maXX BM3000 Operating Manual

4.6
Set Value Generators
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
2
3
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.
NOTE!
According to application, the homing of the drive must be executed, before the cam
generator is started.

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
via a virtual master axis. The speed is set via Z159.9–. 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
tioning is specified with
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:
Processing time
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Time control via the table index
Time control with virtual master axis
Parameter controlled processing
Count_Interpolation points
Z159.4–
= 2 (whereat the table index starts with 0), if the virtual master axis posi-
Z159.10–
Count_Supporting points 256
------------------------------------------------------------------------- - Cycle time of field bus task
=
Virtual master axis speed
Z159.10–

= 256 Count_Supporting points
= 512. The virtual master axis speed is set as a posi-


results, if it is controlled
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