I can not load my system function and system function block? how can i fix it?

 

Hi,

Every S7 PLC module comes with a set of System Function (SFC) and System Function Block (SFB). The set of SFC and SFB varied among different PLC modules e.g.S7-314CPU and S7-315CPU.

First, check the list of SFC and SFB available in the CPU via MPI, the easiest. You could only use these SFCs and SFBs in your program either you derive from the catalogue or upload from the CPU.

You could not download any SFC or SFB that you might have derived from the catalog to the CPU. Simply, SFCs and SFBs are built-in blocks within CPU.

Hope this help.