Program blocks
5.2 Changing the IP address during runtime
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
169
●
TMail_V6_SEC
For secure transfer of e-mails addressing the e-mail server using an IPv6 address
●
TMail_QDN_SEC
For secure transfer of e-mails addressing the e-mail server using the host name
You will find the description of the SDTs with their parameters in the STEP 7 information
system under the relevant name.
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
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.
