Siemens SIMATIC S7-1500 Manual page 25

Function
Configuration control
PROFINET IO
RT (real time)
IRT (isochronous real time) A reserved bandwidth is available within the send clock
Isochronous mode
MRP (Media Redundancy
Protocol)
MRPD (Media Redundancy
with Planned Duplication)
MRP interconnection
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 11/2022, A5E40882737-AC
Description
integrate devices from various manufacturers into your
plants and production processes.
You can use configuration control to operate different
real hardware configurations with a configured maxim­
um configuration of the hardware. This means especially
in series machine manufacturing you have the option of
operating/configuring different configuration variants of
a machine with a single project.
RT prioritizes PROFINET IO message frames over standard
message frames. This ensures the required determinism
in the automation technology. The data is transferred via
prioritized Ethernet frames.
for the IRT data. The reserved bandwidth ensures that
the IRT data can be transmitted in time-synchronized
intervals, unaffected by other high network loads (e.g.
TCP/IP communication or additional real time communic­
ation). IRT enables update times to be achieved with the
highest deterministics. IRT makes isochronous applica­
tions possible.
The clock synchronization system characteristic acquires
measured values and process data and processes the sig­
nals within a fixed system clock. Isochronous mode thus
contributes to high control quality and hence to greater
manufacturing precision. Clock synchronization reduces
possible fluctuations of the process reaction times to a
minimum. Time-assured processing enables higher
machine clocks to be achieve.
The Media Redundancy Protocol makes it possible to
build redundant networks. Redundant transmission paths
(ring topology) ensure that an alternative communica­
tion path is made available if one transmission path fails.
The PROFINET devices that are part of this redundant net­
work form an MRP domain.
RT mode is possible when using MRP.
The MRP extension, MRPD, has the advantage that if a
device or a line in the ring fails, all other devices are con­
tinuously supplied with IO data without interruption and
with fast 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 MRP interconnection process is an enhancement of
MRP and allows the redundant coupling of two or more
rings with MRP in PROFINET networks. MRP interconnec­
tion is - like MRP - specified in the IEC 62439-2 standard
(Edition 3).
Product overview
3.4 Firmware functions
Additional information
S7‑1500, ET 200MP system manual
(https://support.industry.siemens.
com/cs/ww/en/view/59191792)
PROFINET function manual
(https://support.industry.siemens.
com/cs/ww/en/view/49948856)
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