Profibus Dp-V1; Acyclic Data Communication; Figure 4 Acyclic Communication In Dp-V1: Read Service - ABB LVS Digital Manual

PR OF IBU S DP -V1

2.4 PROFIBUS DP-V1

2.4.1 Acyclic Data Communication

The key feature of version DP-V1 is the extended function for acyclic data communication.
The acyclic data communication is mainly used for configuration and parameterization
purpose. With the acyclic DP-V1 read and write services the master can read or write any
desired data to and from the slave. The data is addressed by slot, index and length. Each data
block can be up to 240 bytes.

Figure 4 Acyclic Communication in DP-V1: Read Service

The transmission of acyclic data is executed in parallel to the cyclic data communication, but
with lower priority. Acyclic services are operated in the remaining time at the end of the DP-
V0 cycle.
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