Ethernet/Ip Protocol; Multicast Telegram - Festo CPX-FB36 Electronics Description

2. Preparing for commissioning
2.1

EtherNet/IP protocol

2.1.1 Multicast telegram

Festo P.BE-CPX-FB36-EN en 1309NH English
EtherNet/IP is an industrial Ethernet protocol, which is pre-
dominantly used in automation technology.
The EtherNet/IP protocol is activated with DIL
switch 1.2 = OFF. The bus node is then identified with the
designation: FB36 - EtherNet IP Remote-IO
After switching the protocol (
unmodified parameters are available:
– IP address
– Diagnostics mode
– System parameters
The DIL switch function remains unchanged.
Retentive bus-specific parameters are only active if the relev-
ant protocol is selected (
Parameterisation examples can be found in appendix C.5.
EtherNet/IP uses IP Multicast telegrams as standard for
transferring process data. An advantage of Multicast com-
pared to Unicast is that a telegram can be received by mul-
tiple participants.
Simple switches, however, cannot distinguish to which parti-
cipant a Multicast telegram is to be transferred. Therefore,
these switches send the Multicast telegrams to all devices in
the network.
This results in an EtherNet/IP participant receiving numerous
unnecessary telegrams, which must then be discarded from
the device. This can reduce the response times of the parti-
cipants. The demand on the network bandwidth increases.
section 1.2.1) the following
section 1.2.1).
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