Datalogic AMT58 Series, Manual

Page: 90 / 435

AMT58x-PB Profibus®
33
6.4.2 Bytes 11 - 12
Counts per revolution
WARNING
You can set a new value next to this
Counts per revolution item only
if Class 2 functionality = ENABLED; if Scaling function = ENABLED
the set resolution value is enabled and used by the encoder; on the
contrary, if
Scaling function = DISABLED you are allowed to set a
new resolution value, however it is not enabled even if sent to the
encoder: the encoder still goes on using the default value uploaded
from the GSD file, NOT the new entered value, until you enable the
Scaling function . See the section “6.4.1. Byte 10 – Operating
parameters” on page 31.
Counts per revolution parameter allows to program a user specific
singleturn resolution (i.e. the desired number of information per
revolution).
Byte 11 12
Bits 15-8 7-0
Data 2
15
to 2
8
2
7
to 2
0
You are allowed to set any integer value less than or equal to the
Hardware counts per revolution. However we suggest setting a value
that is a power of 2 (1, 2, 4, … 2048, 4096, ...).
Default = 4096 (min. = 1, max. = 8192) for AMT58 multiturn encoder
WARNING
If you set a value greater than the maximum allowed value (i.e.
greater than the Hardware counts per revolution value), the encoder
falls into an error signalling the faulty condition through the diagnostic
LEDs (see on page 13).
WARNING
When you set a new value next to the
Counts per revolution item,
please always check also the Total resolution item value and be sure
that the resulting number of revolution complies with the Hardware
number of revolutions of the device.
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 singleturn resolution, for instance Counts per
revolution = 360.
If we do not change the Total resolution value at the same time, we
will get the following result:
Number of revolutions =
33554432
( Total resolution )
= 93206.755...
360 ( Counts per revolution)