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AMT58x-PN ProfiNET®
6. Profinet interface
6.1 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 follows 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, equivalent 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 channel 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
automation 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 operations.
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
number 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 transmission 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 on page 11.
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