OB122 troubleshooting answers
1 question with answers cited from the manufacturer manuals.
- 0S7-1500 OB122 I/O access error (16#42) in RUN, what to check?
An OB122 I/O access error on a Siemens S7-1500 CPU indicates a problem during direct access to I/O data, such as reading from an input module. The CPU will remain in RUN and log a diagnostics buffer entry. A 16#42 fault …