Siemens SIMATIC S7-1500 Manual page 29

Product overview
2.4 Firmware functions
Function
OPC UA
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)
28
Description
With OPC UA, you can exchange data via an open and
manufacturer-neutral communication protocol.
The CPU can act as OPC UA server. The CPU acting as
the OPC UA server can communicate with OPC UA cli-
ents.
In turn, the CPU can access an OPC UA server as OPC UA
client, allow the OPC UA server to run methods and
read out information from the OPC UA server.
The OPC UA Companion Specification allows methods
to be specified uniformly and independently of the
manufacturer. Using these specified methods, you can
easily 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 maxi-
mum configuration of the hardware. This means espe-
cially 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 stand-
ard message frames. This ensures the required deter-
minism in the automation technology. The data is
transferred via prioritized Ethernet frames.
for the IRT data. The reserved bandwidth guarantees
that the IRT data can also be transmitted unaffected by
a high network load (for example, TCP/IP communica-
tion or additional real-time communication) in reserved,
synchronized intervals. IRT enables update times to be
achieved with the highest deterministics. IRT makes
isochronous applications possible.
The clock synchronization system characteristic acquires
measured values and process data and processes the
signals 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 com-
munication path is made available if one transmission
path fails. The PROFINET devices that are part of this
redundant network 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
continuously supplied with IO data without interruption
and with fast 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.
Additional information
Communication function manual
(https://support.industry.siemens.co
m/cs/ww/en/view/59192925)
S7-1500, ET 200MP system manual
(https://support.industry.siemens.co
m/cs/ww/en/view/59191792)
PROFINET function manual
(https://support.industry.siemens.co
m/cs/ww/en/view/49948856)
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB