Siemens SIMATIC NET PROFIBUS Owner's Manual page 63

Building Automation
In other words, we are assuming that instabus EIB exists and that you want to
use, for example, an S7 PLC for administrative control tasks or, for example, an
HMI system for central operator control and monitoring. The main emphasis here
is in offices or apartment blocks etc.
The simplest option for connecting these systems to instabus EIB is provided by
the DP/EIB link since these systems generally access the peripheral devices via
PROFIBUS.
The main areas of application are as follows:
S (Primary) open-loop control, closed-loop control and monitoring of heating
systems
S Ventilation, air-conditioning, and
S Energy management and optimization
Industrial Automation
In this case, we assume that PROFIBUS exists and that you would like to include
the electrical components of an assembly line, plant or production building in the
automation. The main emphasis here is the equipment of industrial buildings
themselves.
Applications include, for example, the following:
S lighting control
S shutter control,
S measurement of temperature, wind strength, or the position of the sun,
S door control and
S building access controls.
The instabus EIB is specifically designed for such tasks and provides a wide
selection of components and a large network span (maximum 1000 m per bus). Up
to 11,520 instabus EIB devices are possible in one network (a maximum of 15
areas each with a maximum of 12 buses each with up to 64 nodes).
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Topologies of SIMATIC NET PROFIBUS Networks
2-37