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

35
Foundation Fieldbus
Carlos Eduardo
Pereira
Federal University of Rio
Grande do Sul
Augusto Pereira
Pepperl-Fuchs
Ian Verhappen
Industrial Automation
Networks Inc.
35.1 Introduction..................................................................................... 35-1
35.2 Foundation Fieldbus Overview..................................................... 35-1
35.3 Topology...........................................................................................35-2
35.4 Drivers (DD, EDDL, and FDT/DTM)..........................................35-3
35.5 Cables................................................................................................35-3
35.6 Segment Design...............................................................................35-4
35.7 FFPS—Fieldbus Power Supplies....................................................35-5
35.8 Installation of Segment in Safe Areas..........................................35-6
35.9 Installation of Segments in Classified Areas............................... 35-7
FISCO—Fieldbus Intrinsically Safe Concept. •. High-Energy
Trunk–Fieldbus Barrier Solution
35.10 Project Documentation..................................................................35-8
35.11 Installations and Commissioning................................................35-8
35.12 Maintenance................................................................................... 35-10
References.................................................................................................. 35-10
35.1 Introduction
This chapter describes the foundation fieldbus (FF) protocol, proposed by the Fieldbus Foundation
organization and standardized as IEC norm [IEC00a,IEC00b,VP02,PF03,PN09]. This protocol, which
has a strong influence from the World FIP protocol and is mainly used in process automation applications
[BE01], has as its main characteristic a full distribution of control functions, which can run on
processing units embedded on sensors and actuators. In the open, nonproprietary Foundation architecture,
each field device has its own “intelligence” and communicates via an all-digital, serial, two-way
communications system. For that purpose, standardized function blocks, such as PID control, analog
and digital inputs and outputs, etc., are available. This section gives an overview on the physical layer
(Manchester-encoded bus-powered communication), the communication stack capabilities, and on the
“user layer” (on which function blocks are interconnected and control strategies are defined).
35.2 Foundation Fieldbus Overview
Every FF field device is capable of executing those functionalities encapsulated in function blocks that are
the basic elements for programming FF applications and executing control and automation algorithms,
such as PID control, arithmetic operations, analog and digital input/output, etc. Another major characteristic
of the FF protocol is its advanced diagnostic capability, which defines not only the health of the device
but now also in a standard format that can be easily integrated into asset-management systems.
In order to guarantee that messages exchanged between function blocks residing on different devices
are successfully transferred to their destinations within precise and bounded temporal intervals, FF relies
35-1
© 2011 by Taylor and Francis Group, LLC