User might just execute one transaction/program but STAD might display many entries for that single transaction/program  each entryis a dialog step in SAP term. How many dialog-steps are displayed under a transaction/program is related to program/transaction design and how that transaction is executed.
Connections of the types TCP, ISO-on-TCP, UDP, ISO and S7 connection are configured in the SIMATIC Manager in NetPro. These connections are configured in the same way in STEP 7 (TIA Portal). In STEP 7 (TIA Portal) the S7 connections have to be configured in the Devices and Networks editor, in the Network view.
Area code 717 is a telephone area code which serves south central Pennsylvania, used in the Harrisburg-Lancaster-York metropolitan areas. 717 was one of the original area codes established in 1947. It originally covered the eastern half of the state except for the Delaware and Lehigh valleys.