18
MOVITRAC
®
31.. PROFIBUS Fieldbus Interface
3
The PROFIBUS-DP
Interface
To set these process data configurations, the 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 inverter must conform to
the following conventions:
– The amount of input or output data must correspond to the contents of the following table.
– The number of input bytes and output bytes must be the same.
The inverter interprets the length of the DP configuration passed to it as shown in the table. The six
different process data configurations for PROFIBUS-DP are described below.
3 .1.2
Configuring for 1 Process Data Word (1 PD)
Control of the MOVITRAC
®
31.. inverter using only one process data word requires, for example,
that the Cfg_Data identifier byte is coded as shown in Fig. 13. This code must be sent to the
inverter by the DP master when PROFIBUS-DP is started so that the DP master and DP slave can
exchange a process data word.
01164AEN
Fig. 13: Configuration data example for setting 1 input/output word (1 PD)
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
1
LSB
MSB
= F0
= 240
hex
dez
1
1
1
0
0
0
0
Data length: 1 word
Input/output
Word structure
Consistency over the complete length
Cfg_Data identifier byte
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