User guide

5 Function blocks
5.136 L_SdSetAxisData - machine parameters
514
Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.136.3 Resolution of an encoder revolution
C04249 serves to set the resolution - tailored to the application.
• The preset resolution of 16 bits/revolution is sufficient for standard applications.
[5-107] Example: Standard resolution (16 bits/revolution)
• For higher-order applications, a higher resolution of the position values may lead to considerab-
ly improved control properties and positioning accuracies.
• Finer resolution of the position targets  improved positioning accuracy
• Finer quantisation of the setpoints and actual values  higher control quality
• Higher loop gain can be adjusted  less following errors
• However, a higher resolution results in a restricted number of encoder revolutions and only
smaller traversing paths can be displayed.
[5-108] Example: Higher resolution (22 bits/revolution) with restricted traversing range
 Tip!
The way how to detect the optimum resolution of the position values is described in the fol-
lowing subchapter "Detecting the optimum resolution
". ( 516)
 Sign bit
 Number of revolutions: 15 bits ≡ ±32767 revolutions
 Resolution of an encoder revolution: 16 bits ≡ 65536 increments/revolution
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 Sign bit
 Number of revolutions: 9 bits ≡ ±512 revolutions
 Resolution of an encoder revolution: 22 bits ≡ 4194304 increments/revolution
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