Further notes on operation
8.2 Network settings with Fast Ethernet / gigabit Ethernet
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02
57
Automatic setting or individual network settings
As default, the CP is set to automatic detection (autosensing/autonegotiation/autocrossing).
In normal situations, the default setting ensures troublefree communication. You should only
change these in exceptional situations.
NOTICE
If you create a manual configuration for the CP, the automatic negotiation of the network
settings (autonegotiation) is no longer effective. In this case, if the communication partner
of the CP works with autonegotiation, this can lead to disruptions in communication.
Only use manual configuration when the communication partner works with the same
manually set configuration.
Autocrossing mechanism
The automatic setting also includes an "autocrossing" mechanism. With autocrossing, you
can connect network components and end devices using either crossover or straight-through
cables.
STEP7 / NCM Diagnostics and Web diagnostics display the network setting
Diagnostics of the port settings for the CP described here is possible using the entries in the
diagnostic buffer, with Web diagnostics, with SNMP, NCM Diagnostics and the LED displays.
You will find information on the currently used network settings in STEP 7 as follows:
● In NCM Diagnostics under the diagnostic object "Industrial Ethernet" in the "Network
Attachment" group box;
● Select the module in HW Config > "PLC" menu > "Module Information"
● In WEB diagnostics
Diagnostic data of the Ethernet interface is available only with Web diagnostics, SNMP and
NCM Diagnostics.
Further notes:
● Autocrossing
If you disable automatic detection, the autocrossing is also disabled. Which cable you can
use depends on the integration of the CP (network component or end device).
● 10/100 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 STEP7 / HW Config
(in the properties dialog of the CP). As default, the CP is configured for automatic
detection.
● Forcing 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.
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