16
MOVIDRIVE
®
PROFIBUS DFP11A
3
The PROFIBUS-DP
Interface
handled by the bus system. For example, position values of the MOVIDRIVE
®
drive inverter should
be transferred in a consistent manner, i.e. it has to be ensured that contiguous data are also trans-
ferred together and not, for example, that the least significant part of the position is transferred one
bus cycle ahead of the more significant part.
00087AEN
Fig. 11: Format of the Cfg_Data identifier byte to DIN E 19245 Part 3
The MOVIDRIVE
®
drive inverter supports six different process data configurations. To control the
drive inverter, you can define the amount of process data to be transferred using 1, 2 or 3 process
data words and also enable/disable a parameter channel for read/write access to all drive parame-
ters. This produces the following process data configurations:
• 1 process data word (1 PD)
• 2 process data words (2 PD)
• 3 process data words (3 PD)
• 1 process data word + parameter channel (1 PD + Param)
• 2 process data words + parameter channel (2 PD + Param)
• 3 process data words + parameter channel (3 PD + Param)
This configuration is set up solely via the DP master as the bus system is started up, so that no
additional manual parameterizing of the drive inverter is required. This automatic configuring
mechanism enables download applications to be implemented where the drive inverter can be
completely controlled and parameterized via the bus system.
To set these process data configurations, the drive inverter supports a number of different codes
for the Cfg_Data identifier byte. The process data configuration is allocated based on the amount of
input and output data. A valid DP configuration sent from the DP master to the drive inverter must
conform to the following conventions:
• The amount of input or output data must correspond to the contents of Table 2.
• The number of input bytes and output bytes must be the same.
Table 2: Possible data lengths of the DP configuration and their interpretation
Length of the input/output data
Meaning
2 bytes or 1 word
1 process data word
4 bytes or 2 words
2 process data words
6 bytes or 3 words
3 process data words
10 bytes or 5 words
1 process data words + parameter channel
12 bytes or 6 words
2 process data words + parameter channel
14 bytes or 7 words
3 process data words + parameter channel
7
6
5
4
3
2
1
0
MSB
LSB
Data length
0000 = 1 byte/word
1111 = 16 byte/word
Input/output
00 = special identifier formats
01 = input
10 = output
11 = input/output
Format
0 = byte structure
1 = word structure
Consistency over
0 byte or word
1 complete length