9 Further Notes on Operation
Automatic Setting or Individual Network Settings
As default, the CP is configured for automatic detection (autosensing). As soon as you define a configuration manually when configuring the CP with
STEP 7/HW Config (in the properties dialog of the CP − “Port Parameters” tab), the automatic negotiation of the network settings (autonegotiation) is no longer in effect. If, on the other hand, the communication partner works with autonegotiation, no communication will be established.
Only use manual configuration when the communication partner works with the same manually set configuration.
Notice
When operating with PROFINET IO, a transmission rate of 100 Mbps full duplex is necessary.
Further Notes:
SAutocrossing
If you disable the “automatic setting” option in the “Port Parameters” tab, autocrossing is also disabled; which cable you can then use depends on the role of the CP (network component or end device).
S10/100 Mbps network components without “Autonegotiation”
If you use 10/100 Mbps network components that do not support “Autonegotiation”, you may have to set the mode manually during CP configuration using STEP 7 / HW Config (in the properties dialog of the CP). As default, the CP is configured for automatic detection.
SForcing a specific network setting instead of “Autonegotiation”
If your application requires a fixed network setting instead of “Autonegotiation”, both partner devices must have the same setting.
SNo reaction to Autonegotiation query with manual configuration
Remember that if you configure the CP manually, it will not react to an autonegotiation query! As a result, a connected partner will not be able to make the required network setting and communication will not be established.
Example:
If, for example, the CP is set to “100 Mbps − full duplex”, a CP connected as partner will set “100 Mbps − half duplex”. Reason: Due to the fixed setting, no autonegotiation response is possible; the connected partner recognizes the 100 Mbps with autosensing but nevertheless remains in half duplex.
B3L−48 | CP |
Release 03/2007 |
