Lenze 2130IB - Manual (Page 33)

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The diagram explains the PROFIBUS access to controller data. Here you
have to distinguish between access to process data and parameter data.
Process data
Process data are data memories where several individual parameters
are combined to form a new parameter: the process data. These
process data are exchanged as fast as possible and cyclically between
the controller and the master. Typical process data are set-value and
control information as well as actual value and status information.
Process data can be divided into process output data (PO data) and
process input data (PI data) and they have a fixed length of 4 byte,
viewed from the master. A summary of parameters is described in the
chapter "process data configuration".
For PROFIBUS-DP, the process data in the user data phase are
permanently exchanged between master and controller. The exact
assignment of the DP user data phase can be obtained from the
chapter "DP user data".
For PROFIBUS-FMS, process data are accessed via parameter
setting using the PROFIBUS services Read or Write. The process
time is considerably longer than for PROFIBUS-DP.The process data
can be accessed under the following index:
Index = 6010hex
process input data
Index = 6011hex process output data
Parameter data
Parameters are all DRIVECOM and Lenze controller parameters. A
read and write access is possible for all these parameters. The
parameter is addressed by its index and subindex. The process time in
the controller is considerably longer than the process data access.
For PROFIBUS-DP, the parameters are accessed using the DP
parameter setting channel, which is transmitted cyclically in the user
data. Here, it uses the first 8 byte. The parameter setting channel can
be deactivated using code L-C1905, the DP user data being reduced
by 8 byte.
For PROFIBUS-FMS, the access is possible using the PROFIBUS
services Read or Write.
From the diagram you can see that a parameter which is defined as a
process data value, can be accessed in several ways. The
DRIVECOM parameter, for example, can be directly accessed by its
index 6040hex. It can also be accessed as process output value
(POW1) in the parameter "process output data (index 6011hex). For
PROFIBUS-DP, a direct access using DP user data is also possible.
To avoid write access conflicts, parameters which are process data
must only be changed directly using the user data for PROFIBUS-DP.
For PROFIBUS-FMS, the write access must always be via the
parameter "process output data".