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XAC80 Profibus-DP
®
Byte 15 16 17 18
Bit 31-24 23-16 15-8 7-0
Data 2 31 to 2 24 2 23 to 2 16 2 15 to 2 8 2 7 to 2 0
Allowed values are less than or equal to the
Total hardware resolution
value.
Setting a value greater than allowed causes the resolution to be forced to the
Total hardware resolution
value.
Number of revolutions =
Total resolution
Counts per revolution
We recommend the Number of revolutions to be set to a power of 2. This is
meant to avoid problems when using the device in endless operation (when
crossing the physical zero) and entering the "Red Zone" (see the “7.8 "Dead
Zone"” section on page 55).
Default = 262 144 (min. = 1, max. = 262 144)
for XAC8018/1
Default = 134 217 728 (min. = 1, max. = 134 217 728) for XAC8013/16384
Default = 1 073 741 824 (min. = 1, max. = 1 073 741 824) for XAC8016/16384
WARNING
When you set a new value next to the
Total resolution
parameter, please
always check also the Counts per revolution parameter value and be sure that
the resulting number of revolutions complies with the Hardware number of
revolutions
of the device.
Let's suppose our encoder is programmed as follows:
Counts per revolution
: 8,192
Total resolution
= 33,554,432
10
= 8,192 (cpr) * 4,096 (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.
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).
MAN XAC80 PB E 1.0.odt 7 - Profibus® interface 47 of 60