Siemens RS-485 Wartungshandbuch Seite 9

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PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
9
PROFIBUS networks
1
1.1 Local area networks in manufacturing and process automation
1.1.1 General introduction
Communications systems
The performance of control systems is no longer simply determined by the programmable
logic controllers, but also to a great extent by the environment in which they are located.
Apart from plant visualization, operating and monitoring, this also means a highperformance
communication system.
Distributed systems
Distributed automation systems are being used increasingly in manufacturing and process
automation. This means that a complex control task is divided into smaller "handier"
subtasks with distributed control systems. There are therefore exacting requirements for
communication between the distributed systems. Such structures have, for example, the
following advantages:
Independent and simultaneous startup of individual sections of plant/system
Smaller, clearer programs
Parallel processing by distributed automation systems
This results in the following:
Shorter reaction times
Reduced load on the individual processing units.
Systemwide structures for handling additional diagnostic and logging functions
Increased plant/system availability since the rest of the system can continue to operate if
a substation fails.
A powerful and comprehensive communication system is indispensable to a distributed plant
structure.
SIMATIC NET
With SIMATIC NET, Siemens provides an open, heterogeneous communication system with
local area networks graded by performance for the various levels of manufacturing and
process automation in an industrial environment. The SIMATIC NET communication systems
are based on national and international standards according to the ISO/OSI reference
model.
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