Datalogic AMT58-PB Series Instruction Manual page 48

AMT58x-PB Profibus®
It follows that the encoder will work within the limits of the "read
zone" for 96 revolutions (4096 - 2 * 2000 = 96), i.e. for 480000 counts
(96 * 5000).
The problem can be explained graphically:
NOTE
 When the encoder is operating within the limits of the "red zone",
the status is indicated by the green LED flashing while the red
LED is OFF (see the section "6.8 "Red zone"" on page 13).
 When the encoder is operating within the limits of the "red zone"
(i.e. for 5000 cpr * 96 revolutions = 480000 counts: 9519999 ...
9999999), the transmitted position is consistent with the set
resolution: it is calculated so that the last position within the "red
zone" before crossing the zero position is
 Please be careful using the position information sent by the
encoder when it is operating within the limits of the "red zone".
When the encoder crosses from the normal status to the "red
zone" status (and vice versa), a position information error occurs.
See the Figure above: when entering the "red zone" the position
information jumps from 9999999 to 9519999!
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"Total resolution -1".