Siemens SIMATIC ET 200AL, System Manual

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Preface
PROFINET with STEP 7
6
Function Manual, 05/2021, A5E03444486-AL
What's new in the PROFINET function manual, Version 09/2016 compared to Version 12/2014
This manual (version 09/2016) encompasses the following new functions compared to the
previous version (version 12/2014):
Function Applications Your benefits
PROFINET IO on the
2nd PROFINET inter-
face
You can operate another PROFINET IO system
on the CPU or connect additional IO devices.
You use a fieldbus type in the plant.
The CPU can perform fast and deterministic data
exchange as an I-device with a higher-level con-
troller (PROFINET/Ethernet) through the second
line.
IRT with very short
data cycle times down
to 125 µs
You realize high-end applications with IO
communication which place very high perfor-
mance demands on the IO processing.
You make PROFINET IO communication and
standard communication possible via one cable
even with a send clock of 125 µs.
MRPD: Media Redun-
dancy with Planned
Duplication of frames
PROFINET IO IRT enables you to realize applica-
tions that place particularly high demands on
the reliability and accuracy (isochronous
mode).
By sending the cyclic IO data in both directions in
the ring, the communication to the IO devices is
maintained even when the ring is interrupted and
does not result in device failure even with fast
update times. You achieve higher reliability than
with MRP.
PROFINET perfor-
mance upgrade
You can implement applications with high
speed and send clock requirements. This is of
interest to applications with high demands on
performance.
Better utilization of the bandwidth results in short
reaction times.
Limitation of the data
infeed into the net-
work
You limit the network load for standard Ether-
net communication to a maximum value.
You flatten peaks in the data feed.
You share the remaining bandwidth based on
demand.
Conventions
STEP 7: We refer to "STEP 7" in this documentation as a synonym for the configuration and
programming software "STEP 7 as of V12 (TIA Portal)" and subsequent versions.
This documentation contains pictures of the devices described. The figures may differ slightly
from the device supplied.
You should also pay particular attention to notes such as the one shown below:
Note
A note contains important information on the product, on handling of the product and on the
section of the documentation to which you should pay particular attention.
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.