Machine Data and Incremental Dimensions
8-23
FM 351 Positioning Module
C79000-G7076-C351-02
Example
• An incremental encoder has the following data:
– Increments per encoder revolution: 5000
– Distance per encoder revolution: 1000 mm
– 1 increment = 4 pulses
This results in the following resolution (4x decoding):
Resolution
1000 mm
=
5000 increments
=
0.2000
mm
increment 4 pulses
=
mm
0.0500
pulse
mm
=
0.2000
• An SSI encoder has the following data:
– Increments per encoder revolution: 4096
– Distance per encoder revolution: 1000 mm
– 1 increment = 1 pulse
This results in the following resolution:
Resolution
1000 mm
=
4096 increments
=
0.2441
mm
increment
pulse
mm
= 0.2441
Relationship Between Travel Range and Resolution
The travel range is limited by the numeric representation in the FM 351. The
number representation varies depending on the resolution. Therefore, make sure
that you are always within the permissible limits when specifying values.
The maximum travel range is represented in the table below:
Resolution (RES) is in the range Maximum travel range
0.1
m
/
pulse
≤ RES < 1
m
/
pulse
–10
8
m to 10
8
m (–100 m to + +100 m)
1
m
/
pulse
≤ RES ≤ 1000
m
/
pulse
–10
9
m to 10
9
m (–1000 m to +1000 m)
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