Lenze I/O system 1000 System Manual - Manual (Page 613)

PROFINET communication
About PROFINET
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613 EDSIO1000 EN 7.0
12 PROFINET communication
12.1 About PROFINET
PROFINET is an open industrial Ethernet standard by PROFIBUS & PROFINET International
(PI) for automation technology. PROFINET is standardised in IEC 61158.
PROFINET uses TCP/IP and IT standards and complements the PROFIBUS technology for
applications where fast data communication in combination with industrial IT functions
is required.
There are two PROFINET command classes which can be implemented in three
performance steps:
ƒ PROFINET IO
– RT communication
– IRT communication
ƒ PROFINET CBA (is not supported by the EPM−S140 bus coupler)
– TCP/IP communication
PROFINET IO
PROFINET IO describes an I/O data view on decentralised peripherals. PROFINET IO
describes the entire data exchange between the I/O controller and the I/O device. In the
configuration, PROFINET IO is based on PROFIBUS.
PROFINET IO always features the real time concept. PROFINET IO uses a
Provider/Consumer model in contrast to the master/slave method under PROFIBUS. This
supports the communication relations (AR = Application Relation) between the equal
nodes at the Ethernet. Here, the provider transmits its data without a request of the
communication partner. In addition to the user data exchange, functions for
parameterisation and diagnostics are supported as well.
RT communication
RT stands for Real Time. RT communication is the basis for data exchange with PROFINET
IO. Here, RT data is treated with higher priority.
IRT communication
IRT stands for Isochronous Real Time. With IRT communication, the bus cycle starts in a
true−to−cycle mode, i.e. with a max. permissible deviation and is consistently synchronised.
This ensures the time−controlled and cycle−synchronous transfer of data. Here, sync frames
of a sync master in the network provide for synchronisation.