Siemens SIMATIC S7-1500 Manual page 23

Product overview
2.4 Firmware functions
Function
PROFINET IO
RT (real time)
IRT (isochronous real time) A reserved bandwidth within the send clock is available
Isochronous mode
MRP (Media Redundancy
Protocol)
MRPD (Media Redundancy
with Planned Duplication)
Shared device
PROFIenergy
22
Description
RT prioritizes PROFINET IO telegrams over standard
telegrams. This ensures the required determinism in the
automation technology. In this process the data is
transferred via prioritized Ethernet telegrams.
for IRT data. The reserved bandwidth ensures that the
IRT data can be transmitted in time-synchronized inter-
vals, unaffected by other high network loading (e.g.
TCP/IP communication or additional real-time commu-
nication). Update times with maximum determinism
can be realized through IRT. Isochronous applications
are possible with IRT.
The Isochronous mode system property acquires meas-
ured values and process data and processes the signals
in a fixed system clock. Isochronous mode thus contrib-
utes to high control quality and hence to greater manu-
facturing precision. Isochronous mode reduces possible
fluctuations of the process reaction times to a mini-
mum. Time-assured processing makes higher machine
cycles possible.
It is possible to establish redundant networks via the
Media Redundancy Protocol. Redundant transmission
links (ring topology) ensure that an alternative commu-
nication path is made available if a transmission link
fails. The PROFINET devices that are part of this redun-
dant network form an MRP domain.
RT operation is possible with the use of MRP.
The advantage of the MRP extension MRPD is that, in
the event of a failure of a device or a line in the ring, all
other devices continue to be supplied with IO data
without interruption and with short update times.
MRPD is based on IRT and MRP. To realize media redun-
dancy with short update times, the PROFINET devices
participating in the ring send their data in both direc-
tions. The devices receive this data at both ring ports so
that there is no reconfiguration time.
The "Shared device" function allows you to divide the
modules or submodules of an IO device up among dif-
ferent IO controllers. Numerous IO controllers are often
used in larger or widely distributed systems. Without
the "Shared device" function, each I/O module of an IO
device is assigned to the same IO controller. If sensors
that are physically close to each other must provide
data to different IO controllers, several IO devices are
required. The "Shared device" function allows the mod-
ules or submodules of an IO device to be divided up
among different IO controllers, thus allowing flexible
automation concepts. You can, for example, combine
I/O modules that are physically close to each other in
one IO device.
PROFIenergy is a PROFINET-based data interface for
switching off consumers centrally and with full coordi-
nation during pause times regardless of the manufac-
turer or device type. Through this, the process should
only be provided with the energy that is absolutely
required. The majority of the energy is saved by the
process; the PROFINET device itself only contributes a
few watts of savings potential.
Additional information
PROFINET function manual
(https://support.industry.siemens.co
m/cs/ww/en/view/49948856)
CPU 1511-1 PN (6ES7511-1AK02-0AB0)
Equipment Manual, 05/2021, A5E40869673-AB