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Deployment Ethernet communication - PROFINET
Basics PROFINET
9
Deployment Ethernet communication - PROFINET
9.1 Basics PROFINET
General
PROFINET IO
PROFINET CBA
TCP/IP Communication
RT Communication
IRT Communication
Properties of PROFINET
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n
PROFINET is an open Industrial Ethernet Standard from PROFIBUS & PROFINET
International (PI) for automation. PROFINET is standardized in the IEC 61158.
n
PROFINET uses TCP/IP and IT standards and supplements the PROFIBUS tech-
nology for applications, where fast data communication with industrial IT functions is
demanded.
There are 2 PROFINET function classes:
n
PROFINET IO
n
PROFINET CBA
These may be realized in 3 performance steps:
n
TCP/IP communication
n
RT communication
n
IRT communication
n
With PROFINET IO an I/O data sight to the distributed periphery is described.
PROFINET IO describes the whole data transfer between IO controller and IO device.
PROFINET is configured like PROFIBUS.
n
PROFINET IO always contains the real time concept.
n
Contrary to the master-slave procedure of PROFIBUS, PROFINET uses the provider-
consumer model. This supports the communication relations (AR = Application Rela-
tion) between equal participants in the Ethernet. Here the provider sends its data
without a request of the communication partner. Apart from the user data exchange
also functions for parametrization and diagnostics are supported.
n
PROFINET CBA means Component Based Automation.
n
This component model describes the communication between autonomously working
stations.
n
It makes a simple modularization of complex plants possible, by distributed intelli-
gence by means of graphic configuration for communication of intelligent modules.
This is the open communication via Ethernet TCP/IP without any demand on real-time.
RT means Real-Time. The RT communication represents the basics for data transfer at
PROFINET IO. Here RT data are handled with higher priority.
IRT means Isochronous Real-Time. With the IRT communication the bus cycle begins
clock-exactly i.e. with a maximum permissible tolerance and is again synchronized.
Thereby the time-controlled and synchronous transfer of data is guaranteed. Here sync
telegrams of a sync master in the network serve for.
PROFINET of IEC 61158 has the following properties:
n
Full-duplex transfer with 100MBit/s via copper respectively fibre optics.
n
Switched Ethernet
n
Auto negotiation (negotiates the transfer parameters)
n
Auto crossover (transmission and receipt lines are crossed automatically if neces-
sary)
System 300S
HB140 | CPU | 315-4PN23 | en | 18-02
+
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