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Configuration
Parameter manual
b maXX
BM5800
Document No.: 5.16029.03
Baumüller Nürnberg GmbH
208
3.4
Via the parameter
Fieldbus options bit 1 can be set that the acceptance of the
set values in the position/speed controller takes place in the beginning of the next fieldbus
cycle only.
Transmission sequence from the fieldbus to the controller
The basic sequence from fieldbus transmission (here EtherCAT) up to the processing in
the controller is shown in the following figure.
Figure 64:
Set value and actual value transfer from the fieldbus to the controller. The configuration fieldbus
cycle 1 ms, RT0 cycle 250 µs, sync offset 0 µs is shown in the example.
In the controller the set value as well as the actual value transmission takes place in the
fieldbus task. The set values (at a sync offset of 0 µs) must reach the controller before the
sync signal takes place. As the fieldbus processor requires time to receive the data from
the fieldbus and then to provide it to the controller, this data must be provided to the field-
bus in time. Alternatively the fieldbus task start and resultant the transmission in the con-
troller can be delayed via the sync offset.
During data exchange between the controller and the fieldbus processor the set values
and the actual values are exchanged back to back. The same applies for data exchange
to the fieldbus (default behavior at EtherCAT: common frame for set values and actual
values).Consequential the actual values are delayed by about two fieldbus cycles.
Содержание b maXX BM5800
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