Datalogic AMT58*-PN Series Instruction Manual page 83

AMT58x-PN ProfiNET®
It follows that for 189267968 positions (1073741824 - 442236928 * 2
= 189267968), i.e. for 11552 revolutions, the encoder will work within
the limits of the so-called "red zone". After position 189267968 (i.e. at
the end of the "red zone") a position error (namely, a "jump" in the
position count) would happen as the following position would be "0".
See the Figure in the previous page.
NOTE
Make attention using the values sent by the encoder while working
within the limits of the "Red Zone". When the encoder changes from
normal status to "Red Zone" status (and vice versa) a jump of
position occurs.
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