GE PAC8000 series, Руководство пользователя

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Contents
16 PAC8000* IO PROFINET Scanner
User’s Manual–September 2017
GFK-2839B
1.4.5.1 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 at least 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 like 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 PNS can be configured to be an MRC. Configuring the PNS 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 PNS
is otherwise unchanged.
1.4.6 USB Port
The USB port, below LEDs, on the faceplate behind the cover on PNS, can be used to
connect a computer for firmware updates of the PAC8000 PNS. The USB port accepts a
standard USB cable (USB Micro B Male to USB Type A Male, not included). The port must
be set up before using it, as described in chapter 2.
Note : The USB port is for firmware upgrades only. It is not intended for permanent
connection.