Lenze E94A - Manual (Page 476)

5 Function blocks
5.127 L_SdInterExtrapolatePosition - signal interpolation
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Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.127.1 Extrapolation function
The FB fills in missing position data by extrapolation. These position data may be missing because
of stochastic errors (e.g. EMC interferences) or the bus cycle being greater than the task cycle of the
application.
• Select a linear or a quadratic extrapolation in C04431.
• Set the number of extrapolation steps in C04432:
5.127.2 Interpolation function
The FB fills in missing position data by interpolation. These process data are missing because the bus
cycle is greater than the task cycle of the application.
• Select a linear or a quadratic interpolation in C04431.
• Set the number of interpolation steps in C04432:
C04437 -214748.3647 Unit 214748.3647 Position at the output
• Display of the dnPosOut_p output
signal in the real unit of the ma-
chine.
C04438 -214748.3647 Unit/t 214748.3647 Speed at the output
• Display of the dnSpeedOut_s out-
put signal in the real unit of the
machine.
Parameter Possible settings Information

Note!
A great number of interpolation/extrapolation steps may cause the extrapolated output
signal to reverse, e.g. if the input signal with a rough resolution is brought to a standstill.
• Select in C04433 if reversing is permitted or not. In the Lenze setting of C04433, rever-
sing is not permitted.
C04432
Bus cycle [ms]
Task cycle [ms]
-------------------------------------- =
C04432
Bus cycle [ms]
Task cycle [ms]
-------------------------------------- =