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Hi,
I saw this 21h error code in the error status S6 of the controller status when online with the PLC.
I red this error description in the manual. I changed new analog I/O modules 1762-IF4 and 1762-IF2OF2. But same error.
I have a controller micrologix 1200 and it is faulty, major error code 21h "this is a user defined fault code"
I need if somebody has experience with this fault (confirm if it is a hardware failure)