Operating Instructions

Communication via PROFIBUS and PROFINET
3.1 PROFIDRIVE profile - Cyclic communication
Fieldbuses
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
35
3.1.6
Data structure of the parameter channel
Structure of the parameter channel
The parameter channel consists of four words. The 1st and 2nd words transfer the
parameter number, index and the type of task (read or write). The 3rd and 4th words contain
the parameter content. The parameter contents can be 16-bit values (such as baud rate) or
32-bit values (e.g. CO parameters).
Bit 11 in the 1st word is reserved and is always assigned 0.
You can find application examples relating to the parameter channel at the end of this
section.
AK: Request and response IDs
Bits 12 … 15 of the 1st The parameter channel words contain the request and response
identifier AK.
Table 3- 3 Request identifiers, control → inverter
AK
Description
Response identifier
positive
negative
0
No request
0
7 / 8
1
Request parameter value
1 / 2
7 / 8
2 Change parameter value (word) 1 7 / 8
3
Change parameter value (double word)
2
7 / 8
4
Request descriptive element
1)
3
7 / 8
6
2)
Request parameter value (field)
1)
4 / 5
7 / 8
7
2)
Change parameter value (field, word)
1)
4
7 / 8
8
2)
Change parameter value (field, double word)
1)
5
7 / 8
9 Request number of field elements 6 7 / 8
1)
The required element of the parameter is specified in IND (2nd word).
2)
The following request IDs are identical: 1 ≡ 6, 2 ≡ 7 3 ≡ 8.
We recommend that you use identifiers 6, 7, and 8.