REXROTH Fv Series, Instruction Manual

Page: 197 / 222

12.3.4 Periodical Data Communication
PPO Data Type
PROFIBUS-DP defines data structure for periodical data communication as
PPO (the Parameter Process date Object). Bosch Rexroth PROFIBUS adapt‐
er supports 5 PPO types shown in fig. 12-31 "PPO type" on page 195 . PPO
message is divided into two data areas in terms of transmission data con‐
tents:
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 detail descriptions of PKW area and PZD area, please refer to chapter
"PKW Parameter Area" on page 195 and chapter "PZD Process Data Area"
on page 201 .
Fig.12-31: PPO type
PKW Parameter Area
This data area is composed of ID, IND, VALUE_high and VALUE_low, as
shown in fig. 12-32 "PKW area data format" on page 196 . They are used to
read or modify the parameter of a certain function code of frequency convert‐
er, but only one function code can be read or modified each time. When mas‐
ter gives request and slave makes response, bit definition for each specific
word in PKW area is shown in fig. 12-33 "Request Data Frame in PKW
Area_from master to slave" on page 196 and fig. 12-34 "Response Data
Frame in PKW Area_from slave to master" on page 197 . If frequency con‐
verter fails to execute PKW area request command, it will return error code to
the master in VALUE_low. Refer to fig. 12-35 "PKW area error codes" on
page 197 for details.
DOK-RCON02-FV*********IB01-EN-P
Rexroth Frequency Converter Fv Bosch Rexroth AG 195/219
Communication Protocols