OR 9401 at starting out a value greater than 4 000 000 000

I use DAQ Assistant to read linear a NI 9401 moving in a cDAQ 9178 chassis.  On a few occasions, when I load the VI and start logging from the front position there is no movement, the NI 9401 generates the values as high as 4,294,967,241.  He slowly counts down and then when there's actual movement, the 9401starts OR count the position of 0.  On other occasions, it starts normally from a position of 0.  No one knows what means this high value and why it's output?

johnsold wrote:

A number like who are close the possible extreme values for an I32. I suspect that your negative movement caused a reversal of meter that has been interpreted as a maximum or near maximum negative number.

You are actually at the limit of 32 (32-bit unsigned integer).  If the movement back would result in turnover between 0 and 4294967295 and slowly down while moving backward.

Tags: NI Hardware

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