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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.
Note
To ensure a correct dynamic configuration process, the operation mode for the
autonegotiation of both communication partners must be supported and
activated.
4.1.2.4.3 Errors Occurring when Configuring the Transmission Mode
Invalid configurations are listed below:
Problem
Mismatch of the
transmission rate
Duplex mode
mismatch
Mismatch using
autonegotiation
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Cause
Occurs when configuring one
link partner with 10 Mbit/s
and the other one with 100
Mbit/s.
Occurs when one link partner
is running in full-duplex and
the other in half-duplex mode.
Occurs when one link partner
is running in auto-negotiation
mode and the other one is
using a static configuration of
the transmission mode in full-
duplex operation.
Fieldbus Communication
ETHERNET
Symptoms
Link failure
Faulty or discarded data packets as
well as collisions on the medium.
The link partner, which is in
autonegotiation mode, determines the
network speed via the parallel
detection procedure and sets the duplex
mode to half-duplex. If the device is
operating in full-duplex mode with
static configuration, a duplex mode
mismatch will occur (see above).
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