Chapter 6. Profinet Interface; A Brief Introduction To Profinet - Datalogic AMT58 Series Manual

CHAPTER 6
PROFINET INTERFACE

A BRIEF INTRODUCTION TO PROFINET

PROFINET IO is the open industrial network devised for automation applications and
built on the Ethernet application layer (TCP/IP and IT standards). For PROFINET IO the
layers 1 through 7a of the ISO/OSI (Open Systems Interconnection) reference model are
exclusively based on internationally proven standards. The functionality of PROFINET is
defined in layer 7b. PROFINET IO complies with IEEE802.3 Ethernet Standard and fol-
lows the standards IEC 61158 and IEC61784, so it is 100% Ethernet compatible.
Its technology development and standardization are entrusted to Profibus & Profinet
International (PI), the international umbrella organization including members of more
than 1400 companies (www.profibus.com).
PROFINET IO is expressly developed to connect controllers (named IO controllers, equiv-
alent to Profibus DP Masters), peripheral devices (named IO devices, similar to Profibus
DP Slaves) and programming devices / PCs (named IO supervisors) with Ethernet Real
Time (RT) and Isochronous Real Time (IRT) communication all the way. Real Time chan-
nel is used for time-critical process data and allows to meet the real-time requirements
of the automation engineering (cycle times < 500 µs, jitter < 1 µs); while IRT is suitable
for sophisticated motion control and high performance applications in factory automa-
tion and permits cycle times lower than 250 µs with less than 1 µs jitter. The standard
TCP/IP channel is used for parametrization, configuration and acyclic read/write opera-
tions.
A PROFINET IO system requires at least one IO Controller and one IO Device. The most
frequent network topologies can be implemented and even mixed together including
Star, Line, Tree and Ring structures by means of copper or fiber-optic cables. The num-
ber of devices (each one fitted with its own MAC address, IP address and device name)
which can be connected in the PROFINET network is virtually unlimited. The transmis-
sion rate is 100Mbit/s with full duplex communication (Fast Ethernet).
PROFINET IO Devices are configured using a configuration tool which acts as the IO
Supervisor. The IO Supervisor uses a GSD (General Station Description) file based on
XML language, thus it is called GSDML file, see "
Description of the GSDML file" on page 19
INSTRUCTION MANUAL
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