Siemens SIMATIC S7-1500 Equipment Manual page 23

Function
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
CPU 1516T-3 PN/DP (6ES7516-3TN00-0AB0)
Equipment Manual, 11/2022, A5E40898375-AC
Description
for IRT data. The reserved bandwidth ensures that the IRT
data can be transmitted in time-synchronized intervals,
unaffected by other high network loading (e.g. TCP/IP
communication or additional real time communication).
Update times with maximum determinism can be real­
ized 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 contributes
to high control quality and hence to greater manufactur­
ing precision. Isochronous mode reduces possible fluctu­
ations of the process reaction times to a minimum. Time-
assured processing makes higher machine cycles pos­
sible.
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 redundant net­
work 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 redund­
ancy with short update times, the PROFINET devices par­
ticipating in the ring send their data in both directions.
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 differ­
ent 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 coordina­
tion during pause times regardless of the manufacturer
or device type. The goal is that the process is only
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.
Product overview
3.4 Firmware functions
Additional information
23