Profinet Communications; Media Redundancy Protocol Support - Emerson PACSystems RX3i User Manual

User Manual
GFK-2883F
Table 1
PROFINET IO-Controller
PROFINET IO-Device
PROFINET IO-
Supervisor
1.5.1

PROFINET Communications

For details about communications on an RX3i PROFINET network, refer to the PACSystems
RX3i & RSTi-EP PROFINET I/O Controller Manual, GFK-2571, and to the PACSystems RX3i
PROFINET Scanner Manual, GFK-2737.
1.5.2

Media Redundancy Protocol Support

PROFINET Media Redundancy Protocol (MRP) supports devices configured in a ring
topology. It is based on the functions of IEC62439. Media Redundancy Protocol is not
routable between different IP subnets.
Each device within a Redundant Media network has two physical pathways to two other
devices on the network. To connect to the ring, each device requires an integrated switch
with at least two external ports (ring ports) that support Media Redundancy Protocol.
Devices that are not MRP-capable can be connected to a device, such as an MRP-capable
switch, in the ring, but they cannot be in the ring themselves. The redundant paths only
extend to the devices on the ring that are MRP-capable and enabled.
One of the devices on the ring must be configured as the Media Redundancy Manager
(MRM), and all the other devices must be configured as Media Redundancy Clients (MRCs).
The RX3i CEP Carrier can be configured to be an MRC. Configuring the RX3i CEP Carrier as
an MRC alters how the Ethernet ports connect to the network. They attempt to indicate
their state to the MRM before allowing traffic to flow between the ports and close the ring
topology through the internal switch. They also send out notifications to the MRM when a
port is lost. Operation of the RX3i CEP Carrier is otherwise unchanged.
Overview
A PROFINET IO-Controller collects data from I/O devices (inputs) and
provides data to the devices (outputs). It is associated with one or more
IO-Devices.
A PROFINET IO-Device is a distributed I/O Device that is coupled to a
PROFINET IO-Controller through PROFINET. In an RX3i system, the RX3i
CEP Carrier operates as an IO-Device, managing initialization,
configuration, and communication between the PROFINET controller
and the I/O modules.
An IO-Supervisor can be a programming device, a computer, or an HMI
device. The PROFINET IO-Supervisor is typically used for commissioning
or diagnostics.
Chapter 1
Sep 2019
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