Siemens SENTRON VL Series System Manual page 130

PROFIBUS data transfer
6.6 The three communication paths
Path 1 enables fast and simple entry to PROFIBUS DP communication. This path contains
sufficient data to meet most requirements. Communication with path 1 always takes place
with a class 1 master. With cyclic data, certain contents are predefined. These can be
changed in the three basic types and thus easily adapted to requirements (e.g. replacement
of the phase-to-phase voltage UL12 by the number of operating hours).
Path 2
①
②
③
④
⑤
With this, the SENTRON circuit breaker can also be used to read or write acyclic data sets
from a class 1 master. This is useful, for example, to request extremely extensive data
volumes. However, this data, e.g. data of the waveform buffer, does not have to be read
cyclically.
Path 3
①
②
③
With this, the SENTRON circuit breaker can be used to read or write acyclic data sets from a
class 2 master. This is useful, for example, to request extremely extensive data volumes.
Switch ES Power uses this path for communication with the 3WL circuit breaker.
130
S7 class 1 master
Request DPV1 acyclic
Request DPV0 cyclic
Response DPV0 cyclic
Response DPV1 acyclic
PC class 2 master
Request DPV1 acyclic
Response DPV1 acyclic
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02