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

40
PROFINET
Max Felser
Bern University of
Applied Sciences
Paolo Ferrari
University of Brescia
Alessandra
Flammini
University of Brescia
40.1 Introduction.....................................................................................40-1
Device Classes in PROFINET IO. •. Performance. •. Conformance
Classes. •. Prerequisites
40.2 PROFINET IO Basics......................................................................40-5
Device Model. •. Address Resolution. •. Cyclic Data
Traffic. •. Acyclic Data Traffic. •. Diagnostics
40.3 IRT Communication in PROFINET IO......................................40-8
Flexible Communication Based on RT_CLASS_2
(Orange Interval). •. Communication Based on RT_CLASS_3
(Red Interval). •. Cycle Duration and Constrains
40.4 Engineering and Commissioning...............................................40-11
GSD File. •. Device Addressing. •. System Power-Up. •. .
Neighborhood and Topology Detection. •. Redundancy
40.5 Integration of Fieldbus Systems and Web Applications..........40-14
Integration via Proxy. •. Web Integration
Acronyms...................................................................................................40-15
Bibliography...............................................................................................40-15
40.1 Introduction
PROFINET is the real-time (RT) Ethernet solution developed by PROFIBUS International (PI), the world
association of PROFIBUS and PROFINET manufacturers and users. The PROFINET protocol is an international
standard since it has been incorporated in the current edition of the IEC 61158 and IEC 61784
standards. In details, the IEC61784 defines the subsets of the services specified in IEC 61158 that are to be
applied for PROFINET under the designation “Family 3” with subdivisions 3/3, 3/4, 3/5, and 3/6.
From the abstract point of view, the PROFINET concept is a modular concept that allows the user to
choose the functionality he requires. Generally, the functionality differs mainly in terms of the type of
data exchange; for instance, some applications have very stringent requirements for data transmission
speed, while other applications need data refresh cycles of tens of milliseconds.
The development of PROFINET started in 2000. The first released specifications described the
so-called PROFINET CBA (component-based automation) protocol. PROFINET CBA is suitable for
component-based machine-to-machine communication via TCP/IP and object-oriented programming.
It enables a simple modular design of plants and production lines based on distributed intelligence using
graphics-based configuration of communication between intelligent modules. The basic idea behind
CBA is that whole automation systems can often be grouped into autonomously operating units. The
structure and functionality can be repeated in identical, or slightly modified, form in multiple plants.
These so-called PROFINET CBA components are generally controlled by an easily identified set of input
signals. Within the component, a control program written by the user executes the required functionality
of the component and sends the corresponding output signals to another controller. Thanks to
40-1
© 2011 by Taylor and Francis Group, LLC