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XAC80 Profibus-DP
®
If we do not change the
Total resolution
value at the same time, we will get
the following result:
Number of revolutions =
134,217,728 (
Total resolution
)
= 372,827.02
360 (
Counts per revolution
)
As you can see, the encoder is required to carry out almost 373,000 revolutions,
this cannot be as the hardware number of revolutions is, as stated, max. 16,384.
When this happens, the encoder falls into an error.
WARNING
When you enable the scaling function ( Scaling function control = 1), please
enter scaled values next to the Counts per revolution and Total resolution
parameters that are consistent with the physical values. In the case of
inconsistent values, the system does not go online.
WARNING
Every time you change the value in this parameter, then you are required to set
a new preset value (see the the
Preset value
parameter).
7.4.3 Bytes 15 … 18
Total resolution
WARNING
This is only available when the encoder Class 2 or the encoder Class 2 (+VEL) are
installed.
You can activate a new value next to the
Total resolution
item only if
Class 2
functionality
= ENABLED. If
Scaling function control
= ENABLED the set
resolution values are enabled and used by the encoder; on the contrary, if
Scaling function control
= DISABLED you are allowed to set new resolution
values, however they are not enabled even if sent to the encoder: the encoder
still goes on using the physical values, NOT the new entered values, until you
enable the
Scaling function control . See the “7.4.1 Byte 10 - Operating
parameters” section on page 43.
If
Class 2 functionality
= DISABLED or
Scaling function control
= DISABLED,
then the system uses the physical values to arrange the position information.
This parameter is intended to set a custom number of distinguishable steps over
the total measuring range. The total resolution of the encoder results from the
product of
Counts per revolution
by the required
Number of revolutions
.
MAN XAC80 PB E 1.0.odt 7 - Profibus® interface 46 of 60