I still get errors in the diagnostic buffer and requests OB122

H-H

Hello mhkocak,

The I/O access error is a synchronous error.
There's SFC36 "MSK_FLT" for masking synchronous errors which means that the CPU will not trigger OB122 or OB121in a certain priority class.
You can filter which error to be masked and which to be not.
For unmasking errors you will have to use SFC37 "DMSK_FLT".

You didn't mentionwhether you have S7-300 or S7-400 but be careful and read the help of SFC36 (If you are going to use it)carefullybecausethe behavior of S7-300 differs to behavior of S7400.

You can try it as it's there but honestly I never used it and will never do.
I always prefer that all errorsget registered in diagnostic buffer and always have the SF LED to remind the maintenance guys ''You have a problem - Solve it''.

Best regards.

H-H