SFA-5000 • SFA-10000 EtherCAT
To know the linear resolution of the encoder please consider that
the stroke
per turn of the drum is 200 mm
.
The linear resolution results from the following calculation:
Linear resolution
=
Stroke per turn of the drum
Singleturn resolution cpr
If you want to know the linear position value you will need to multiply the
transmitted position value by the linear resolution.
Linear position value
=
transmitted position
*
linear resolution
NOTE
Please note that the encoder's linear physical resolution can be read also in the
order code next to the rotary resolution. Refer to the product datasheet.
EXAMPLE 1
Let's suppose that we are using the physical resolution of the SFA-5000-EC-
8192-M12 draw-wire encoder (the bit 2
object = 0).
The physical singleturn resolution of the measuring device is 8,192 cpr (= 0.024
mm, see the order code in the product datasheet).
As stated, the linear resolution results from the following calculation:
Linear resolution
=
Stroke per turn of the drum
Resolution cpr
Linear resolution
=
200
= 0.024 mm = 24 µm
8192
Let's say that the transmitted position value is 123.
Thus the linear position value will be as follows:
Linear position value
= transmitted position * linear resolution
Linear position value
= 123 * 0.024 = 2.952 mm = 2,952 µm
EXAMPLE 2
Let's suppose that we are using the SFA-5000-EC-8192-M12 draw-wire
encoder. The singleturn resolution is set to the custom value of 4,000 cpr
(
= 4000). The transmitted position value is
1,569.
The linear resolution can be easily calculated as follows:
MAN SFA_5000_10000_EC E 1.0.odt
6 - EtherCAT® interface
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