IBH S7-CX315/CX317:Task 2 SEQ converter

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To reuse symbols and to avoid double documentation there is a converter, that permits to apply STEP7 symbols from symbolic tables (*.SEQ) files into I/O tasks. It is also possible to read variables from the I/O tasks and convert into STEP7 symbolic tables.

The converter tool 'Task2Seq' also permits to create new I/O tasks from the contents of a symbolic table and to refresh I/O task contents with the contents of the symbolic table. It is also possible to create new symbolic tables from existing I/O tasks.

Refreshing the I/O tasks with the contents from a symbolic table can be performed in different ways.

Symbolic tables are created with the STEP7 Symbol Editor. The following steps are required:

  • Open the symbolic table in the STEP7 Symbol Editor.
  • Select the menuitem 'Symbol table -> Export'.
  • In the 'Export' dialog choose the format "Assignment list (*.SEQ)".

Symbolic tables can also be imported with the STEP7 Symbol Editor. The following steps are required:

  • Open the symbolic table in the STEP7 Symbol Editor.
  • Select the menu item 'Symbol table -> Import'.
  • In the 'Import' dialog choose the format "Assignment list (*.SEQ)".

S7 for Windows® projects always work with SEQ files. To exchange the symbolic table of a S7 for Windows® project, only a symbolic table with identical name needs to be created. It can be replaced in the project with the Windows Explorer.

If an I/O Task is going to be created, do only select variables that are really needed. Otherwise the variables will not work for other communication (e.g. Modbus). Even if they are not linked in the TwinCAT System Manager.

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