Length of the PKW and PZD areas
The lengths of the PKW and PZD areas can be parameterized independently (p2022 (number of
PZDs), p2023 (number of PKWs)). The master and slave communication partners have to agree
on the lengths of the individual areas.
• Constant number of user data
If telegrams are to be used only with a constant number of user data, the sum of the numbers
of PKWs and PZDs must not exceed 126. According to the specication, a maximum of
252 bytes (126 words) of user data are permissible.
• Variable PKW proportions
If telegrams with variable proportions of PKWs are to be used, the parameter for the number
of PKWs (p2023) must be set to 127, irrespective of how the parameter for the number of
PZDs is parameterized.
You can nd additional information on the PKW number can be found in section Parameter value
(PWE) (Page 315) and on the PZD number in section Process data (Page 317).
A.1.1 Parameter interface
The PROFIBUS "variable-speed drives" prole denes the user data structure with which a master
can access slaves.
The area for the parameter channel of the telegram can be used for monitoring and / or changing
any parameters in the slave.
The parameter channel can be used to edit and monitor process data (read / write) as described
below.
Parameter channel
The parameter channel comprises 3 or 4 words according to the channel type.
3DUDPHWHUFKDQQHO
VWZRUGQG
ZRUG
UGDQGWKZRUG
3.(,1'3:(
PKE Parameter ID
IND Parameter index
PWE Parameter value
Figure A-2 Structure of the parameter channel in the telegram structure
Appendices
A.1 Structure of user data/process data
ATD4xxW for industrial applications
310 System Manual, 06/2022, A5E51901827B AA
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