AMT58x-PB Profibus®
35
Let's say our encoder is programmed as follows:
Counts per revolution
: 8192
Total resolution
= 33554432
10
= 8192 (cpr) * 4096 (rev.)
Let's set a new total resolution, for instance:
Total resolution
= 360.
As the
Total resolution
must be greater than or equal to the
Counts
per revolution
, the above setting is not allowed. When this happens,
the encoder falls into an error signalling the faulty condition through
the diagnostic LEDs (see on page 13).
WARNING
We recommend the Number of revolutions to be set to a value that is
a power of 2. If the set number of revolutions is not a power of 2, the
so-called “Red Zone” will be created and the encoder will necessarily
work inside its limits. For any information on the "Red Zone" refer to
section “6.8 "Red zone"” on page 41.
WARNING
The AMT58 multiturn encoder can be configured so that it works
exactly as the singleturn encoder.
This is achieved by setting
Total resolution
=
Counts per revolution
.
Let's suppose the encoder is set as follows:
Counts per revolution
= 8192
Total resolution
= 8192
So it follows that:
Number of revolutions =
8192 (
Total resolution)
= 1
8192 (
Counts per revolution
)
This is exactly the configuration of the singleturn encoder.
It is of course obvious that the contrary is not possible.
Example
multi-turn encoder with 24-bit resolution
Hardware counts per revolution = 12 bit/turn (4096 cpr)
Hardware number of revolutions = 12 bit (4096 rev.)
Hardware total resolution
= 24 bit (4096
4096 = 16777216)
multi-turn encoder with 25-bit resolution
Hardware counts per revolution = 13 bit/turn (8192 cpr)
Hardware number of revolutions = 12 bit (4096 rev.)
Hardware total resolution
= 25 bit (8192
4096 = 33554432)
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