PROFIBUS Communication
3/5
WL Circuit Breaker
Graphic 3-2
The 3-stage communication concept not only enables quick and easy access, but also ensures that the system can be adapted for more
complex demands. Stage 1 is standard; stages 2 and 3 optional.
The 3-Stage Communication Concept
This concept provides quick and
easy access to the PROFIBUS-DP
communication system with WL
circuit breakers.
Stage
Stage 1 provides quick and easy
access to the PROFIBUS-DP
communication system. This
stage already includes sufficient
data to fulfill most requirements.
Communication in stage 1 is
always carried out with a class
1 master.
Stage
The cyclic data contains certain
predefined content. It can be
changed in the three basic types and,
therefore, easily adapted to prevailing
requirements (e.g. replacing phase-
to-phase voltage with the number of
operating hours). This is an additional
option to stage 1.
Stage
In stage 3, acyclic data records can, if
required, be read or written by a class
1 or class 2 master. This is useful for
requesting a large volume of data
so that it does not have to be read
cyclically (e.g. waveform buffer data).
1
2
3
WL PROFIBUS Communication and Electronic Accessories • July 2004