Operation
17
Realization without PROFIBUS-DP V1
Acyclic data transmission without PROFIBUS-DP V1 is based on
the usage of data blocks in the input and output data cyclically
transmitted to a specific slave. -- These data blocks are used as
"envelopes" in which data can be entered if required and from
which results can be read. Since these data blocks are
transmitted cyclically, this method slightly increases the
transmission time, but this increase is negligible.
There are modules in the device database file that are tailored to
this application - like for the slave-specific configuration data for
cyclic operation. -- A total of 2 modules is available for acyclic
transmission. One module is dedicated to writing, and one to
reading of data.
Data blocks in the input and output data are reserved for the read
and write services, regardless which of the services is selected. -
The service is entered in the output data and transmitted to the
slave. The result is transmitted to the master in the input data.
Up to 4 acyclic services can be used in parallel for every
controller. To achieve this, the necessary modules must be
entered together in the slave-specific configuration data. --
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