Siemens CP 1243-1 Operating Instructions Manual page 118

Program blocks
5.1 Program blocks for OUC
For changing configuration data of the CP during runtime:
● T_CONFIG V1.0
Program-controlled configuration of the IP parameters
The program block can be found in STEP 7 in the "Instructions > Communication > Open
User Communication" window.
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
Create the SDT required for every connection description as a data block (global DB).
You generate the SDT type by entering the name e.g. "TCON_Param" in the "Data type" box
manually in the declaration table of the block instead of selecting an entry from the "Data
type" drop-down list. The corresponding SDT is then created with its parameters.
Using the SDT
● TCON_IP_v4
For transferring frames via TCP
● TADDR_Param
For transferring frames via UDP
● TCON_IP_RFC
For transferring frames via ISO-on-TCP (direct communication between two S7-1200
stations)
● TMail_V4
For transferring e-mails addressing the e-mail server using an IPv4 address
● TMail_V6
For transferring e-mails addressing the e-mail server using an IPv6 address
● TMail_FQDN
For transferring e-mails addressing the e-mail server using its name (FQDN)
● TMail_V4_SEC
For secure transfer of e-mails addressing the e-mail server using an IPv4 address
● 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.
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Operating Instructions, 04/2017, C79000-G8976-C365-03
CP 1243-1