wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

15-2 Industrial Communication Systems
Host/FPLC
Standard-I/O
Engineering
Host/PLC
PROFIBUS DP physics
Repeater
Sensor
Actuator
DP/PA
segment
coupler
Standard-I/O
PROFIBUS-PA physics
Field device
Field device
Field device
FIGURE 15.1
Coupling of different fieldbus technologies (physics) using link devices.
have been coupled by specific link devices. Thus, different transmission technologies, particularly for
various application areas, could be used in a complex application. For example, as shown in Figure 15.1,
PROFIBUS-PA using intrinsic-safe and non-intrinsic-safe fieldbus parts, coupled via link devices
(DP/PA segment coupler), mapping different stack layers and application object models.
The Ethernet-based fieldbus technology (e.g., PROFINET [IEC61158,IEC61784]) opened the opportunity
to integrate real-time Ethernet approaches into Office and Internet applications, and thereby the
real-time Ethernet approaches opened the possibility to integrate different fieldbus technologies. As a
result, PROFINET network serves as an automation backbone and enables the connection of various
fieldbus systems with different fieldbus technologies and the exchange of data between the fieldbusspecific
application objects [PIP] (Figure 15.2).
There are various integration concepts (e.g., in terms of PROFINET) and integration mechanisms
(mapping of layer functions, proxy concept, mapping of application objects between fieldbus and
PROFINET, and architecture of necessary link devices):
• Transparent integration: Each fieldbus device (including its data objects) will be mapped to one
PROFINET-IO device.
• Modular integration: Each fieldbus device (including its data objects) will be mapped to a module
of a PROFINET-IO device.
• Compact integration: A complete fieldbus system (including its data objects) will be mapped to
a module of a PROFINET-IO device.
These integration concepts have been focused on locally concentrated industrial communications
and include the opportunity to integrate the plant automation world into the office automation and
Internet application world.
The next step to handle the growing complexity of automation systems (geographically distributed
applications) requires the use of heterogeneous wide area networks (WANs) [CPP06].
© 2011 by Taylor and Francis Group, LLC