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XAC80 Profibus-DP
®
7.4.2 Bytes 11 … 14
Counts per revolution
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
Counts per revolution
parameter
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.
The
Counts per revolution
parameter allows to program a user specific
singleturn resolution (i.e. the desired number of information -distinguishable
steps- per revolution).
Byte 11 12 13 14
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
The custom singleturn resolution value must be less than or equal to the
physical singleturn resolution (hardware counts per revolution value).
Setting a value greater than allowed causes the resolution to be forced to the
Hardware counts per revolution
value.
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, … 2,048, 4,096, …). This is meant to avoid counting errors (refer also to
the “7.8 "Dead Zone"” section on page 55).
Default = 262,144 (min. = 1, max. = 262,144)
for XAC8018/1
Default = 8,192 (min. = 1, max. = 8,192) for XAC8013/16384
Default = 65,536 (min. = 1, max. = 65,536) for XAC8016/16384
WARNING
When you set a new value next to the
Counts per revolution
parameter, please
always check also the
Total resolution
parameter value and be sure that the
resulting number of revolutions complies with the
Hardware number of
revolutions
of the device (1 or 16,384, see the order code).
Let's suppose that our encoder is programmed as follows:
Counts per revolution : 8,192 cpr
Total resolution = 134,217,728
10
= 8,192 (cpr) * 16,384 (rev.)
Let's set a new singleturn resolution, for instance:
Counts per revolution
=
360.
MAN XAC80 PB E 1.0.odt 7 - Profibus® interface 45 of 60