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138 •
Fieldbus Communication
ETHERNET
4.1.2.4
Transmission Mode
Some ETHERNET based WAGO couplers/controllers support both 10Mbit/s
and 100Mbit/s for either full or half duplex operation. To guarantee a safe and
fast transmission, both these couplers/controllers and their link partners must
be configured for the same transmission mode.
Attention
A faulty configuration of the transmission mode may result in a link loss
condition, a poor network performance or a faulty behavior of the
coupler/controller.
The IEEE 802.3u ETHERNET standard defines two possibilities for
configuring the transmission modes:
• Static configuration
• Dynamic configuration
4.1.2.4.1
Static Configuration of the Transmission Mode
Using static configuration, both link partners are set to static transmission rate
and duplex mode. The following configurations are possible:
• 10 Mbit/s, half duplex
• 10 Mbit/s, full duplex
• 100 Mbit/s, half duplex
• 100 Mbit/s, full duplex
4.1.2.4.2
Dynamic Configuration of the Transmission Mode
The second configuration option is the autonegotiation mode which is defined
in the IEEE 802.3u standard. Using this mode, the transmission rate and the
duplex mode are negotiated dynamically between both communication
partners. Autonegotiation allows the device to automatically select the
optimum transmission mode.
Attention
To ensure a correct dynamic configuration process, the operation mode for the
autonegotiation of both communication partners must be supported and
activated.
WAGO-I/O-SYSTEM 750
PROFINET IO
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