Increments per revolution n Total resolution
8,179 5 261,728
2,048 11 4,194,304
NOTE
This restriction is not relevant if the round axis functionality (see "Round axis functional‐
ity", page 40) is activated.
3.7.8 Preset function
The Preset function is used to set the encoder to a predefined start position. With the
help of a preset value, the encoder can be set to any position within the measuring
range.
The preset value can be set in the following way:
•
With the help of the preset pushbutton
•
With an acyclic explicit message
Here the preset value is passed as an attribute (13h) of the position sensor object.
•
With the help of the integrated web server and the ladder routine
DANGER
Before using the Preset function, check whether there is any danger from the machine
or system in which the encoder is integrated!
The Preset function can lead to an immediate change of the position value output by
the encoder.
This could cause an unexpected movement that could endanger people or damage the
system or other objects.
NOTE
The Preset function should only be used when the encoder is at a standstill.
3.7.9 Speed measurement unit
The parameter defines the unit with which the speed is transmitted.
Possible units are:
•
counts/s
1)
•
counts/ms
1)
•
turns/s
•
turns/min
•
turns/h
The factory setting is turns/min.
1)
Depending on the configured resolution.
Example: Resolution = 2,000 steps; the encoder rotates 0.5 times per second = 1,000
counts/s or 1 counts/ms.
3.7.10 Round axis functionality
The round axis functionality removes the restriction that the total resolution must be
2ⁿ-fold the steps per revolution. The shaft is considered an endless shaft.
The steps per revolution are not configured directly, but the numerator and denomina‐
tor for the number of revolutions are determined.
The following requirements must be met or attributes must be set:
3 PRODUCT DESCRIPTION
40
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