Behavior Of Cp 243-1 In The Event Of Configuration Errors - Siemens SIMATIC NET CP 243-1 Technical Manual

Communications processor for industrial ethernet

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09/02

4.6

Behavior of CP 243-1 in the event of configuration er-

rors

If the CP 243-1 recognizes an invalid configuration, it attempts to retrieve its

TCP/IP address parameters (IP address, subnet mask, IP address of Gateway) via

a BOOTP service. The CP 243-1 continues the attempt for approx. 1 minute. If it

does not receive a response from a BOOTP service within this time or if the re-

sponse is invalid or faulty, the red LED ("SF") flashes for approx. 30 seconds. This

procedure is cycled through until the CP 243-1 either finds a valid configuration in

the S7-200 CPU memory or receives a valid response from a BOOTP server.

If the CP 243-1 receives a valid BOOTP response, it configures itself as follows:

• IP address, subnet mask and IP address of the Gateway are taken over from

the BOOTP response

• The transmission type is set to "Auto Negotiation".

• The Keep Alive time for connections is set to 30 seconds.

When configured in this way, the CP 243-1 is able to access the S7-200 CPU from

STEP 7 Micro/WIN 32 through Ethernet. A new valid configuration can now be

loaded in this way. Communication with other controllers is not possible under

these conditions. After a reset, the CP 243-1 configures itself in accordance with

the new configuration.

Note

The Auto Negotiation mode only operates if all connected network components

support this mode.

CP 243-1

J31069-D0428-U001-A1-7618

Configuration

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