AMT58x-PB Profibus®
41
6.8 "Red zone"
The so-called "red zone" occurs when:
Number of revolutions =
Total resolution
Counts per revolution
is NOT a power of 2.
When this problem arises, the device must operate within the “red
zone” for a certain number of positions. The size of the “red zone” is
variable. To calculate it we must subtract the
Total resolution
value
from the Hardware total resolution of the device as many times as
until the difference is less than the the set
Total resolution
value.
When the encoder crosses the limit of the last
Total resolution
section
thus entering the “red zone”, a counting error occurs, i.e. a jump in
the position count. The problem can be represented graphically in the
Figure below.
Example
25-bit resolution multiturn encoder
Hardware counts per revolution
= 8192 (2
13
)
Hardware number of revolutions
= 4096 (2
12
)
Hardware total resolution
= 33554432 (2
25
)
Set parameters values:
Counts per revolution
=
5000
Total resolution
=
10000000
Number of revolutions
= 2000
Hardware number of revolutions
=
4096
= 2.048
Set number of revolutions
2000
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