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Bosch Rexroth AG
Periodical Data Communication
6 Periodical Data Communication
6.1 PPO Data Type
PROFIBUS-DP defines data structure for periodical data communication as PPO
(the Parameter Process date Object). Bosch Rexroth PROFIBUS adapter sup-
ports 5 PPO types shown in
divided into two data areas in terms of transmission data contents:
Parameter area (PKW area): read or overwrite the parameter of a certain
●
function code of slave.
Process data area (PZD area): including control word and reference frequen-
●
cy (data flow from master to slave), or status word, actual output frequency
and other status monitoring values of slave (data flow from slave to master).
For detailed descriptions of PKW area and PZD area, please refer to
6.2 "PKW Parameter Area" on page 20
Area" on page
24.
Fig. 6-1: PPO type
6.2 PKW Parameter Area
This data area is composed of ID, IND, VALUE_high and VALUE_low, as shown in
fig. 6-2 "Data format of PKW area" on page
the parameter of a certain function code of frequency converter, but only one
function code can be read or modified each time. When master gives request
and slave makes response, bit definition for each specific word in PKW area is
shown in
tab. 6-1 "Request data frame in PKW area (from master to slave)" on
20/35
fig. 6-1 "PPO type" on page
and
chapter 6.3 "PZD Process Data
21. They are used to read or modify
PROFIBUS-DP Bus Adapter
20. PPO message is
DOK-RCON01-PROFIBUS***-IB04-EN-P
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