Description of the Software Modules and Parameters
Parameter manual b maXX BM3000
Document no.: 5.12001.07
671
of 820
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Figure 218: Structure of operation mode
4.8.13.1 Transmission of master axis position
The current position of the master axis is specified by the parameters Z122.3– and
Z122.4–. Thereby the parameter Z122.3– indicates the revolutions of the master axis
and the parameter Z122.4– the angle. Both parameters can be written cyclical by a PLC.
In the following the mode is referred to as a "virtual" master axis.
The revolution information oft he master axis is ignored by setting bit 4 in the parameter
Z122.2–. Now, only the angular specification of the master axis is important. If the syn-
chronization to the polynomial curve was selected after starting (Z122.2– bit 0), always
the position in the curve is synchronized, which is within the first master axis revolution.
It is possible to reduce the polynomial calculation cycle with regard to the fieldbus cycle.
This is applied by the parameter
Z131.20– division ration fieldbus task. The examples as
well as the described limitations must be taken into consideration in Z131.20–.
If the division ratio was set greater than 1 the master axis position is automatically inter-
polated linearly with the last master axis position. A delay of the master axis position of a
Z131.18– fieldbus cycle occurs. The drive position is then calculated more frequently cor-
responding to the value of the division ratio.
Due to the linear interpolation of the master axis the option is recommended at constant
master axis speed applications, only!
In all the other cases shorter fieldbus cycle times and the use of cubic interpolation of the
drive position (
Z111.6– interpolation mode = 4) are to be preferred.
By bit 10 of the Z122.2– mode a linear extrapolation of the master axis can be activated.
At a set value fail the master axis position is extrapolated with the last master axis speed.
5000_0315_rev01_int.cdr
Polynominal curve
calculation
Gear
factor
Polynominal curve
segment
Additional motion
Master
position
Options
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