Hello everyone!

A quick question, lets say I uploaded a station from PLC to PC using SM v5.7, and made a minor change to a counter block in an OB. For the changes to take effect, do I download the whole project to PLC or just the OB I made changes to?

And one more thing, to make this change to the logic in a running PLC, do I have to put it in STOP mode or can I do it in RUN mode?

I am using PLC s7-300 CPU 317-2 PN/DP.

Best regards

Hi SufyanK

Download only the Block Updated (on this case OB1) to take effect.
Don´t need CPU Stop.
This download it´s possible in RUN Mode.

Best regards,