315-4PN33

8 Deployment Ethernet communication - PROFINET
8.1 Basics PROFINET
n PROFINET is an open Industrial Ethernet Standard from PRO-
FIBUS & PROFINET International (PI) for automation. PROFINET
is standardized in the IEC 61158.
n PROFINET uses TCP/IP and IT standards and supplements the
PROFIBUS technology for applications, where fast data communi-
cation 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, PRO-
FINET uses the provider-consumer model. This supports the com-
munication relations (AR = Application Relation) 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 diag-
nostics are supported.
PROFINET CBA means Component Based Automation. This compo-
nent model describes the communication between autonomously
working stations. It makes a simple modularization of complex plants
possible, by distributed intelligence 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 toler-
ance and is again synchronized. Thereby the time-controlled and syn-
chronous transfer of data is guaranteed. Here sync telegrams of a
sync master in the network serve for.
General
PROFINET IO
PROFINET CBA
TCP/IP Communication
RT Communication
IRT Communication
VIPA System 300SDeployment Ethernet communication - PROFINET
Basics PROFINET
HB140 | CPU | 315-4PN33 | GB | 14-43 128