Setting the web – Rockwell Automation 20-COMM-E PowerFlex EtherNet/IP Adapter User Manual
Page 22
2-2
Installing the Adapter
20-COMM-E EtherNet/IP Adapter User Manual
Publication 20COMM-UM010G-EN-P
Much of EtherNet/IP implicit (I/O) messaging uses IP multicast to
distribute I/O control data, which is consistent with the CIP producer/
consumer model. Historically, most switches have treated multicast
packets the same as broadcast packets. That is, all multicast packets are
re-transmitted to all ports.
IGMP snooping constrains the flooding of multicast traffic by
dynamically configuring switch ports so that multicast traffic is
forwarded only to ports associated with a particular IP multicast group.
Switches that support IGMP snooping (managed switches) ‘learn’ which
ports have devices that are part of a particular multicast group and only
forward the multicast packets to the ports that are part of the multicast
group.
Be careful as to what level of support a switch has of IGMP snooping.
Some layer 2 switches that support IGMP snooping require a router
(which could be a layer 3 switch) to send out IGMP polls to learn what
devices are part of the multicast group. Some layer 2 switches can use
IGMP snooping without a router sending polls. If your control system is
a standalone network or is required to continue performing if the router is
out of service, make sure the switch you are using supports IGMP
snooping without a router being present.
• See
for the number of CIP connections supported by the
20-COMM-E adapter.
• Verify that you have all required equipment. See
.
Setting the Web Pages
Switch (only Series B
Adapter, Firmware 3.xxx or
Later)
To use the adapter web pages, the Web Pages Switch (not supplied on the
Series A adapter) must be set to its ‘Enable Web’ position. For information
to enable or disable web pages for a Series A adapter, see
Important: A new switch setting is recognized only when power is applied
to the adapter, or the adapter is reset. If you change a switch
setting, cycle power or reset the adapter to apply the change.
Set the Web Pages Switch (SW2 in
) to enable or disable the
adapter web pages. By default, the adapter web pages are disabled. For
complete details on adapter web pages, see
!
ATTENTION: Risk of equipment damage exists. The adapter
contains electrostatic discharge (ESD) sensitive parts that can be
damaged if you do not follow ESD control procedures. Static
control precautions are required when handling the adapter. If you
are unfamiliar with static control procedures, see Guarding
Against Electrostatic Damage, publication 8000-4.5.2.