REXROTH IndraDrive Fc FCS01, Руководство по эксплуатации

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15-6
Control Communication - Field Busses and Protocols Rexroth IndraDrive FCS01.1
DOK-INDRV*--FCS01*****-IB01_EN-P
Profibus - Structure of the Useful Data
Structure of the Useful Data
The structure of the useful data for cyclic data transfer between the
master and the converter is divided into two areas:
Abbr. Significance Purpose
PIDV
Parameterization;
P arameter ID v alue
Select the parameter;
change values
PCD P rocess d ata Transfer of actual and
setpoint values
Fig. 15-6: Structure of useful data
Parameter values can be read and written through the PIDV area of the
useful data. All tasks executed via the PIDV interface are mainly tasks for
configuration, observation and diagnosis.
The PIDV area is used to control the frequency converter. In the process
data, the control word or status word as well as the actual and setpoint
values are transmitted.
One access always comprises job and response telegram. In the job
telegram, the useful data is transmitted from master to slave. In the
response telegram, the useful data is transmitted from slave to master.
The structure of both telegrams is identical.
MASTER SLAVE
Parameter job Control word+setpoints
Parameter word Status word+actual value
PIDV-Range
PCD-Range
Response telegramm
Processing
Job telegramm
Fig. 15-7: Telegram transfer / structure of the useful data area
In the frequency converter, processing the process data takes place
immediately (high priority) to allow for fast reaction to control commands
and for change status change messages to be transmitted to the master
without any delay.
On the contrary, the priority of the processing speed of the PIDV data is
low so that it may take significantly longer to edit.