Profinet Io; Introduction - Siemens SIMATIC CPU 410 System Manual

PROFINET IO

5.1

Introduction

What is PROFINET IO?
PROFINET IO is the open, cross-vendor Industrial Ethernet standard for automation. It
enables continuous communication from the business management level down to the field
level. PROFINET IO is based on switched Ethernet with full duplex mode and a bandwidth of
100 Mbps.
With PROFINET IO a switching technology is implemented that allows all stations to access
the network at any time. As a result, the network can be utilized more efficiently through
simultaneous data transmission of multiple nodes. Simultaneous sending and receiving is
enabled through the full-duplex operation of Switched Ethernet.
In PROFINET IO communication, a portion of the transmission time is reserved for cyclic,
deterministic data transmission (real-time communication). This allows you to split the
communication cycle into a deterministic and an open part. Communication takes place in
real-time.
RT communication (real-time communication)
RT communication is the basic communication mechanism for PROFINET IO and is used
during device monitoring. The transmission of real-time data with PROFINET IO is based on
the cyclic data exchange with a provider-consumer model. To better scale the
communication options and therefor the determinism for PROFINET IO, real-time classes
have been defined for data exchange. These are unsynchronized and synchronized
communication. The details are handled independently in the field devices. Real-time
automatically includes an increase in priority with PROFINET compared to UDP/IP frames.
This is necessary to prioritize the transmission of data in the switches so that RT frames are
not delayed by UDP/IP frames.
Documentation on the Internet
Comprehensive information about PROFINET (http://www.profibus.com/) is available on the
Internet.
Also observe the following documents:
● Installation guideline
● Assembly guideline
● PROFINET_Guideline_Assembly
Additional information on the use of PROFINET IO in automation engineering is available at
the following Internet address (http://www.siemens.com/profinet/).
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
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