Programming (OUC)
5.1 Program blocks for OUC
CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1
96 Operating Instructions, 01/2017, C79000-G8976-C426-03
Connection descriptions in system data types (SDTs)
For the connection description, the blocks listed above use the parameter CONNECT (or
MAIL_ADDR_PARAM with TMAIL_C). The connection description is stored in a data block
whose structure is specified by the system data type (SDT).
Creating an SDT for the data blocks
You create the SDT required for every connection description as a data block. You generate
the SDT type in STEP 7 by entering the name (e.g. "TCON_Param") in the "Data type" box
manually in the declaration table of block instead of selecting an entry from the "Data type"
drop-down list. The corresponding SDT is then created with its parameters.
Depending on the security functions supported, the three CP types support the following
SDTs:
SDTs for all three CP types
The following SDTs can be used by all three CP types:
●
For transferring frames via TCP
●
For transferring frames via UDP
●
For transferring frames via ISO-on-TCP
●
For transferring e-mails addressing the e-mail server using an IPv4 address
●
For transferring e-mails addressing the e-mail server using an IPv6 address
●
For transferring 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 of the SDT.
SDT for CP 1542SP-1 IRC and CP 1543SP-1
These two CP types can use the following SDT for e-mail connections with Security function:
●
For secure transfer of e-mails addressing the e-mail server using an IPv4 address
●
For secure transfer of e-mails addressing the e-mail server using the host name
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