Siemens SIMATIC NET ET 200SP Operating Instructions Manual page 82

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
See section Changing the IP parameters during runtime (Page 84) for more on this.
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).
The SDT type is not created by selecting an entry from the "Data type" drop-down list in the
declaration table of the block, but by entering the name manually in the "Data type" box, for
example "TCON_IP_V4". The corresponding SDT is then created with its parameters.
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Operating Instructions, 12/2019, C79000-G8976-C426-05
CP 154xSP-1