SIEMENS
3/5
Siemens IK PI · 2015
PROFIBUS
Introduction
Process or field communication
3
■
Overview
Communication functions
Process or field communication (PROFIBUS DP, PROFIBUS PA)
is used to link field devices to a programmable controller, HMI
system or control system.
Interfacing is performed over integrated interfaces on the CPU
or through interface modules (IMs) and communications mod-
ules (CPs, CMs).
With modern high-performance automation systems, it is often
more effective to link more than one PROFIBUS DP line to one
system, not just to increase the number of I/O devices that can
be connected, but also to enable individual production areas to
be handled independently of one another (segmentation).
PROFIBUS standardized to IEC 61158/61784 is a high-perfor-
mance, open, rugged fieldbus system with short response times
and the following protocols:
PROFIBUS DP
(Distributed I/O) is used to connect distributed I/O stations, such
as SIMATIC ET 200 with extremely fast response times in accor-
dance with the IEC 61158/EN 50170 standard.
PROFIBUS PA
(Process Automation) extends PROFIBUS DP with failsafe
transmission technology in accordance with the international
standard IEC 61158-2.
*B,.43B@@B434;<
>$
'>
© Siemens AG 2014