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Answers come from vendor manuals and standards.

› What's the difference between OB35 and OB1 in S7-1500?

OB1 is the main cyclic OB — runs continuously. OB35 is a cyclic interrupt OB triggered at a configurable time interval (default 100 ms) regardless of the OB1 scan time.

Source S7-1500 system manual · p.214