Siemens SIMODRIVE POSMO A User Manual page 103

4 Communications via PROFIBUS–DP
4.1 General information about PROFIBUS–DP
Telegram structure
for cyclic
data transfer
PPO types
Table 4-2 Structure of Parameter Process Data Object 1 (PPO 1)
S
Refer to Chapter 4.3
PKE IND
1st 2nd
word word
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
4-102
The telegrams for cyclic data transfer have the following basic struc-
ture:
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Fig. 4-2 Telegram structure for cyclic data transfer
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:
S
4 words for the parameter area (PKW area)
S
2 words for the process data area (PZD area)
PKW
S
PWE
3rd 4th
word word
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
Net data (PPO)
Parameter Process
ID value data
(PKW) (PZD)
Net data
PZD
Refer to Chapter 4.2
PZD PZD
1 2
1st 2nd
word word
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