You can use the FBDK to build a subset of the simple function block type described in Annex D.2 of IEC 61499-1:

• The event interface is restricted to a single REQ/CNF pair.
• The body of the block is restricted to a single REQ algorithm.
• Upon occurrence of an event at the REQ input, the REQ algorithm is executed, following which an event is issued at the CNF output.

These restrictions permit the generation of somewhat more efficent runtime code, as well as simplifying the programming of simple FB types.

To build a new simple FB type, use the following steps:

1. Start the FBDK.
2. Import library elements if and as needed.
3. Create a new simple FB type in the editor by double-clicking on the Simple fb type of the template folder in the Library Navigator.
4. Edit the function block's elements:
   • Edit the FB type's name and comment by double-clicking on the root node of the Element Navigator.
   • Edit the FB type's properties by double-clicking on the corresponding entry in the Element Navigator:
     • Identification
     • Versions
     • CompilerInfo
       • Be sure to enter package fb.rt.<mypkg>; in the header field, where <mypkg> is the name of the src subdirectory you are working in, for example, student or book.
     • Compilers
   • Edit the FB type's interface. You won't be able to add or edit events, since only the REQ/CNF pair is allowed.
   • Double-click on the REQ algorithm in the Navigation panel to bring up an editing dialog for the algorithm.
5. When your editing is complete, save your work with the Save As... button.
   It is a good idea to save your work from time to time while editing, too!
6. Generate and compile a Java® source file with the Save As... =>Java dialog. The results of the compilation (including errors, if any) will be displayed in the Log tab of the Text panel, and a dialog will open indicating whether the compilation has succeeded or not.
7. Test the FB type.