Lenze I/O system 1000 - PROFINET communication; 9.1 About PROFINET

Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17 464
9 PROFINET communication
9.1 About PROFINET
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9 PROFINET communication
9.1 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:
•PROFINET IO
•RT communication
• IRT communication
• 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.