Communication
11.2 PROFINET
S7-1200 Programmable controller
818 System Manual, V4.2, 09/2016, A5E02486680-AK
3. Monitor: When you select this check box, a message is placed in the diagnostic buffer if
any of the following occur at the port:
– A link cannot be established at the port
– An established link fails
– You select "TP 100 Mbps full-duplex" as the Transmission rate / duplex, and the CPU
establishes a link using autonegotiation with the negotiated transmission rate not
equal to 100 Mbps or the negotiated duplex equal to half-duplex.
4. Enable autonegotiation: Once you set the Transmission rate / duplex field to full-duplex at
100 Mbps, you can then disable autonegotiation. Deselect the "Enable autonegotiation"
check box to disable autonegotiation.
Note
If you do not disable autonegotiation, the CPU and the peer device negotiate the port’s
transmission rate and duplex.
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