Siemens CP 343-1 - Manual (Page 47)

9 Further Notes on Operation
B3L−47
CP 343-1 Lean for Industrial Ethernet / Manual Part B3L
Release 03/2007
C79000-G8976-C198-04
Behavior after Memory Reset
The CPU in the S7 station does not recognize that the CP memory was reset. The
CP therefore changes to the “stopped with error” state (see Chapter 4).
The configuration data must then be reloaded.
You can initiate this loading by turning the power off and on again.
9.2 Working with Fast Ethernet − automatic switchover
How Automatic Switchover of the Network Settings Works
The CP has two 10/100 Mbps half/full duplex ports with autosensing and
autonegotiation of the network settings. After turning on the CP, these functions
work as explained below:
S The CP attempts to detect the transmission rate (10/100 Mbps) being used by
the partner.
If no connection is established between partners in PROFINET IO mode, you
should check whether the devices involved are set to “automatic setting” or
100 Mbps full duplex.
S If detection is possible, the CP attempts to negotiate a full duplex with the
partner.
S If no negotiation is possible, the CP uses the previously detected transmission
rate and half duplex.
Duration of the procedure: up to 2 seconds
You set the network properties of the CP in STEP 7 in the properties dialog of the
CP, “Port Parameters” tab.
Autocrossing
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.