BONFIGLIOLI Vectron Agile VABus/TCP, Communications Manual, Page: 42 / 72

9 Parameter access
9.1 Handling of datasets / cyclic writing of parameters
The parameter values are accessed based on the parameter number and the required dataset. There
are parameters the values of which are present once (dataset 0) as well as parameters the values of
which are present four times (dataset 1...4). These are used for dataset switching.
If parameters which are present four times in the datasets are set to Dataset = 0, the four datasets
are set to the same transmitted value. A read access with data set = 0 to such parameters is only
successful if all four data sets are set to the same value. If this is not the case, an error will be sig-
naled.
NOTE
The values are entered automatically in the EEPROM of the controller. When values are
to be written cyclically, no entries shall be made in the EEPROM, as this only allows a
limited number of write cycles (approx. 1 million cycles). When the number of permissi-
ble write cycles is exceeded, the EEPROM will be destroyed.
In order to avoid this, data which is written cyclically can be entered in the RAM exclu-
sively without a writing cycle on the EEPROM. Such data will be lost in the case of a
power failure and have to be written again after Power off/on.
This mechanism is started when the target dataset is increased by five when specifying
the dataset.
Writing on virtual dataset in RAM
Parameters EEPROM RAM
Dataset 0 0 5
Dataset 1 1 6
Dataset 2 2 7
Dataset 3 3 8
Dataset 4 4 9
42
Agile
VABus/TCP 12/13