Moniteur 50 Series SMART Positioners - Manual (Page 13)

Introduction
1-3
Positioner SIPART PS2/SIPART PS2 PA
C79000-G7476-C150–01
1.2.1 PROFIBUS DP and PROFIBUS PA
The PROFIBUS PA ( PA = Process Automation) is a variant of the
PROFIBUS DP (DP = Distributed Peripherals) which is widely used in
manufacturing.
The PROFIBUS PA makes use of special transmission technology and
therefore meets the requirements of process automation and process
engineering. This transmission technology is defined in the international
standard IEC 1158–2. The low transmission rate reduces the power
loss and therefore permits intrinsically safe technology for use in zones
subject to explosion hazard.
Moreover, almost any bus topology can be selected, so that bus, star,
tree, and mixed structures are possible. All types of field devices such
as transducers, actuators, analyzers, etc. can be connected to the
PROFIBUS PA.
The main advantages are:
❑ saving in installation costs
❑ the option of more detailed diagnostics thus increasing the availabil-
ity of plant sections
❑ the option of automatic correction of plant documentation
❑ the option of plant optimization during running operation
In an automation system, several PROFIBUS PA trains are usually
connected to the fast PROFIBUS DP via coupling units. The process
control system is also connected to the PROFIBUS DP.
Both bus systems make use of a standard protocol layer. That makes
the PROFIBUS PA a ”communication compatible” extension of PROFI-
BUS DP into the field.
Transmission
technology
Topology