Getting Started
13
Doc No: UMAN\GWY-500-B\0106
REVISION 4
3.1
Introduction To Profibus
PROFIBUS is a vendor-independent, open fieldbus standard for a wide range of applications in manufacturing, process
and building automation. Vendor independence and openness are guaranteed by the PROFIBUS standard EN 50170. With
PROFIBUS, devices of different manufacturers can communicate without special interface adjustments.The PROFIBUS
family consists of three compatible versions:
High speed
PROFIBUS-DP
DP stands for Decentralised Periphery. It is optimised for high speed and low cost interfacing,
especially designed for communication between automation control systems and distributed I/O
at the device level.
Process Automation
PROFIBUS-PA
PA stands for Process Automation. It permits sensors and actuators to be connected on one
common bus line even in intrinsically-safe areas. It permits data communication and power
supply over the bus using 2-wire technology according the international standard IEC 1158-2.
Higher level
PROFIBUS-FMS
FMS stands for Fieldbus Message Specification. This version is the general purpose solution for
communication tasks at a higher level. Powerful services open up a wide range of applications
and provide great flexibility. It can also be used for extensive and complex communications tasks.
Uniform bus access
PROFIBUS-DP and PROFIBUS-FMS use the same transmission technology and a uniform bus
protocol
access protocol. Thus, both versions can be operated simultaneously on the same cable.
However, FMS field devices cannot be controlled by DP masters or vice versa.
Note:
It is not possible to exchange one of these family members by another family
member. This will cause faulty operation.
The rest of this section only describes PROFIBUS-DP.Protocol architecture.
3.1.1
Protocol Architecture
OSI
The PROFIBUS protocol architecture is oriented on the OSI (Open System Interconnection)
reference model in accordance with the international standard ISO 7498. Layer 1 (physical layer)
of this model defines the physical transmission characteristics. Layer 2 (data link layer) defines
the bus access protocol. Layer 7 (application layer) defines the application functions.
DP- Profiles
DP- Extentions
DP- Basic Functions
Not Defined
Field Bus Data Link (FDL)
RS-485 / Fiber optics
User Interface Layer
(7) Application Layer
(6) Presentation Layer
(5) Session Layer
(4) Transport Layer
(3) Network Layer
(2) Data Link Layer
(1) Physical Layer
Summary of Contents for GWY-500
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