Download program in S7-300, error "Unable to copy the block OB2"

Hello Akash`;

Your CPU is the equivalent of a CPU 314. Here is a list of all available OBs for that type of CPU, from the Standard and System Functions manual.

Note first that not all these functions are downloadable to all CPUs of that family, each one as limited capacities, as was shown in an earlier post of this thread.

Second, there is no such function as OB2 available for any of the CPUs of that family. Please use one that actually exists for your purposes. Or please explain in further details what you planned to do with OB2; you cannot us an OB as you would an FC or FB; an OB is called by the CPU's operating system when it detects specific events (see the list below).

Hope this helps,

Daniel Chartier