Siemens SIMATIC S7-1500 Manual page 25

Function
MRP (Media Redundancy
Protocol)
MRPD (Media Redundan-
cy with Planned Duplica-
tion)
Shared device
PROFIenergy
CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Manual, 12/2017, A5E40882737-AA
Description
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. PROFINET devices that are part of this re-
dundant 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
redundancy with short update times, the PROFINET
devices participating 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 distribute
the modules or submodules of an IO device to different
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. Therefore,
if sensors close in distance to one another have to
supply data to different IO controllers, several IO devic-
es are required. The "Shared device" function allows
you to distribute the modules or submodules of an IO
device to different IO controllers, thus allowing flexible
automation concepts. You can, for example, combine
I/O modules lying near one 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.
Product overview
2.3 Firmware functions
Additional information
25