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

Chapter 1. Overview

1.5 PROFINET Operation

The RX3i CEP Carrier uses PROFINET communications for data exchange. The same network can also be used
for basic Ethernet communications, but use of a separate Ethernet network and RX3i Ethernet interface is
recommended.
A PROFINET network can include three types of devices:
PROFINET IO-Controller
PROFINET IO-Device
PROFINET IO-Supervisor

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.

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.
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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.
PACSystems* RX3i CEP PROFINET Scanner GFK-2883E