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Profibus DP fieldbus
Profibus DP is one of the most widely used fieldbuses in industry.
Based on a master/slave protocol, only master stations, sometimes called active
stations, have the right to access the bus, with slave, or passive, stations being
limited to responding to interrogations.
Version V0 of Profibus only allows cyclic exchanges with I/O, whereas version V1
offers an acyclic message handling channel which can be used for device adjustment
or diagnostics during operation.
The physical link is a single shielded twisted pair, but numerous interfaces are
available for creating all sorts of topologies - tree, star or ring - including those using
optical fibre or a non-physical link.
Gateways can be used to communicate transparently with Profibus PA, one of the
most commonly used standards in process applications for connecting
instrumentation.
Profibus PA can be used to supply devices across the network and also to install
sensors in potentially explosive zones (ATEX).
Unity V5.0
PRM master DTM
PRM Com DTM
Ethernet
Profibus PA
PRM
Profibus DP
DP Class 1
Profibus Remote Master (PRM) module
Presentation
The Profibus Remote Master (PRM) module is connected to the Ethernet Modbus
TCP/IP network via its integrated 2-port switch, as close as possible to the process
and the instrumentation.
The PRM module can be used to connect Modicon Quantum, Modicon Premium and
Modicon M340 PLCs to Profibus DP V1 via the I/O scanner function.
Irrespective of the type of PLC, only one product reference is required and setup is
identical, thus reducing training and maintenance costs.
Two versions are available, standard and tropicalized, so as to adapt to any type of
environment.
The PRM module is open to Asset Management tools.
A dedicated communication DTM is supplied with the product, thus allowing any
compatible FDT standard tool to remotely adjust devices on Profibus using Ethernet
(
see page 6/5).
Configuration
From a single Unity tool, the user can create the Profibus configuration, the PLC
application and configure or calibrate devices.
The latter are integrated in the Unity catalogue via their DTMs if they exist, or their
gsd
files.
The I/O scanner configuration is created implicitly in Unity Pro using the Profibus
configuration. The parameters assigned by default guarantee optimized performance,
as well as the consistency of I/O data in the PLC application, irrespective of the PLC
platform.
Similarly, the I/O variables defined and presymbolized in the DTMs can be used
directly in the application. Finally, the screens integrated in Unity Pro, together with
the diagnostic functions integrated in the device DTMs simplify application
maintenance.
Presentation
Modicon Premium automation
platform
Profibus DP V1 and Profibus PA buses
Profibus Remote Master module
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