EDS84DMOTPBUS EN 3.0 - 11/2011 L 19
Communication manual 8400 motec PROFIBUS
Technical data
Protocol data
4.2 Protocol data
4.3 Communication time
The communication time is the time between the start of a request and the arrival of the
corresponding response.
The communication times in a PROFIBUS network depend on ...
the processing time in the controller;
the transmission delay time (baud rate / telegram length);
the nesting depth of the network.
Processing time in the controller
There are no interdependencies between parameter data and process data.
Area Values
Process data words (PCD) 1 ... 8 words (16 bits/word)
Cyclic parameter data channel (DP-
V0)
4 words
Acyclic parameter data channel (DP-
V1)
Max. 240 bytes
PROFIBUS user data length 1 ... 8 words process data channel + 4 words parameter data channel
Data Processing time
Process data Approx. 2 ms
+ 0 ... 1 ms
+ 1 ... x ms
update cycle
processing time in the module
application task runtime of the technology application used
(tolerance)
Parameter data Approx. 30 ms + 20 ms tolerance (typical)
• For some codes, the processing time may be longer (see software
manual/»Engineer« online help "Inverter Drives 8400 motec").
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