Hi,

S7-1200/1500 always loads consistently - this function is only available for S7-300 PLCs.

Regards,

Towome

genious2015

In S7-300 I can download Specific FC or FB as attached photo

How can enable Download Selection for S7-1200,S7-1500?!

What you are hoping for has been asked before.
Downloading a specific control block onto the S7-1200 / S7-1500 is not possible.

Some workaround ideas has been suggested in the past. You could upload from the PLC to a new project and then modify that project with the changed block. The delta download should then only contain the one changed block.

Without the workaround the S7-1500 offers Software Units. A software unit (containing a group of blocks) can be loaded to the PLC without needing to load everything. This opens the door also to work in groups onto one processor. Downloading one block is still only possible if only one block exists in the software unit.

It is impossible to know what the S7-1200 2nd generation will deliver to us a little later. But frankly, being able to download an offload project without needing to place the PLC in stop, is very welcome already.