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Program blocks

5.2 Changing the IP address during runtime

CP 1243-1

Operating Instructions, 04/2017, C79000-G8976-C365-03

119

Connection establishment and termination

Connections are established using the program block TCON. Note that a separate program

block TCON must be called for each connection.

A separate connection must be established for each communications partner even if

identical blocks of data are being sent.

After a successful transfer of the data, a connection can be terminated. A connection is also

terminated by calling "TDISCON".

Note

Connection abort

If an existing connection is aborted by the

communications partner or due to disturbances on

the network, the connection must also be terminated by calling TDISCON. Make sure that

you take this into account in your programming.

5.2

Changing the IP address during runtime

You can change the following address parameters of the CP at runtime controlled by the

program:

● IP address

● Subnet mask

● Router address

Note

Changing the IP parameters with a dynamic IP address

Note the effects of program

-controlled changes to the IP parameters if the CP obtains a

dynamic IP address from the Internet

service provider: In this case, the CP can no longer be

reached by communications partners.

Requirements - firmware version

Requirements for program-controlled changing of the IP parameters are as follows:

● CP firmware ≥ V2.1.7x

and

● CPU firmware ≥ V4.2

Requirements - program blocks / STEP 7 versions

Program-controlled changing of the IP parameters is supported by program blocks. The

program blocks access address data stored in a suitable system data type (SDT).

Siemens CP 1243-1 User Manual

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