User-defined Function Blocks – CN 37-070 EN
- To prevent this occurring, the following procedures must be avoided in V3.2 and V3.3:
- Putting a program with a user-definable Function Block in the project pool and then retrieving it to a process station. Exporting and importing partial projects as the 'Block import' procedure puts the user-definable Function Block in the pool. Altering the class description after the instances of a user-definable Function Block have been created. Amending or deleting the process name of the user-definable Function Block. Updating function blocks that are used in a user-definable Function Blocks (when the minor version number has changed).
This problem has been solved in DigiTool Version V4.
Valid for software versions: V3.2, V3.3
In the case of user-definable Function Blocks, some procedures can reset the parameter values of instanced Function Blocks to the values of the defined class.