m_medjelled

Micrologix 1200 major error code 21h

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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)

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That is likely program related. Can you post your code?

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Which code did you mean and what is your recommandations to solve this problem?

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Your RSS file. That fault code is user programmed and would be found in the ladder logic

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I downloaded the program (original) using RSlogix 500 but same fault. 

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What I'm saying is post it here so we can see what can cause the user fault.  Without that information there is nothing anything can do to help.

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Find in the attached file the user programm ladder .RSS uploaded after this fault code was appeared.

Thanks for you help.

Best regards.

MICRO1.RSS

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I didn't look up error 21 until now.  Where did you see 21h was a user fault code?  It is an expansion power fail.  See attached.  Since you only have one I/O module, it would be my first guess

21h.pdf

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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.

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