User Manual 08/2003 Edition

4
4 Communications via PROFIBUS DP 02.99
4.1 General information about PROFIBUS DP
Telegram structure
for cyclic
data transfer
PPO types
4-92
The telegrams for cyclic data transfer have the following basic structure:
Protocol
frame
(header)
Net data (PPO)
Parameter
ID
value
(PKW)
Process
data
(PZD)
Fig. 4-2 Telegram structure for cyclic data transfer
Protocol
frame
(trailer)
There are 5 defined PPO types (PPO1 to PPO5).
For SIMODRIVE POSMO A, only PPO type 1 (PPO1) can be used.
PPO1 is structured as follows:
4 words for the parameter area (PKW area)
2 words for the process data area (PZD area)
Table 4-2 Structure of Parameter Process Data Object 1 (PPO 1)
PKW
Refer to Chapter 4.3
PKE IND PWE
1st
word
2nd
word
3rd
word
4th
word
Net data
Refer to Chapter 4.2
PZD
1
1st
word
PZD
2
2nd
word
PZD
PPO1 ...
Abbreviations:
PPO Parameter Process Data Object
PKW Parameter ID value
PKE Parameter ID
IND Sub–index, sub–parameter number, array index
PWE Parameter value
PZD Process data
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SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition
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