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03/03
4.6
Reaction of the CP 243-1 IT to Configuration Errors
When the CP 243-1 IT detects an invalid configuration, it tries to obtain its TCP/IP
address parameters (IP address, subnet mask and IP address of the gateway) via
a BOOTP service. The CP 243-1 IT continues to attempt this for approx. 1 minute.
When it fails to receive a reply from a BOOTP service within this time or the reply is
invalid or has errors, the red LED ("SF") flashes for approx. 30 seconds. This pro-
cedure continues cyclically until the CP 243-1 IT either finds a valid configuration in
the memory of the S7-200 CPU or receives a valid reply from a BOOTP server.
When the CP 243-1 IT receives a valid BOOTP response, it configures itself as
shown below.
• IP address, subnet mask and IP address of the gateway are taken from the
BOOTP response.
• The transmission type is set to "Auto Negotiation."
• The monitoring time for connections (Keep Alive) is set to 30 seconds.
With this configuration, the CP 243-1 IT is finally able to access the S7-200 CPU
via Ethernet from STEP 7 Micro/WIN 32. A new valid configuration can now be ob-
tained in this way. Communication with other controllers is not possible in this
state. After a reset, the CP 243-1 IT then accepts the settings of the new configura-
tion.
Note
Auto Negotiation mode will only work when all connected network components
support this mode.
Note
If no valid CDB/NDB/IDB configuration exists but the CP 243-1 IT will boot with the
aid of a BOOTP server, the functions FTP server and client, e-mail client and HTTP
server are not supported. Not until configuration of the administrator with STEP 7
Micro/WIN 32 can the file system of the CP 243-1 IT be accessed. Not until then
can the configuration files be transferred to the CP 243-1 IT via FTP again.
Caution
The configuration files stored in the file system of the CP 243-1 IT are detected by
the CP 243-1 IT with their endings (.edb, .udb and .fdb). The configuring user must
make sure that only one file of each configuration file type is located in the file sys-
tem of the CP 243-1 IT.
If the file system contains several configuration files with the same ending, there is
no way to predict which of these files will be loaded by the CP 243-1 IT.
CP 243-1 IT
J31069-D0429-U001-A0-7618
Configuration
93
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