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Analog Input Overflow


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The datasheet of a 0402N says:

Ιout>20.3mA = Overflow Value


Is the analog input measuring currents above this, can this value be read in the PLC? 

And what is the maximum readable value? 


I know this range of the analog input card should not be used.  But in a faulty occasion this might happen, and might damage a sensor or other components. And therefore I would like to register the max value.  

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