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Basic information
2
Operation manual CiA 402 Controller Based
2.4
Interpolation
Interpolation is relevant for the following operating modes:
•
Interpolated position mode
•
Cyclic synchronous position mode
•
Cyclic synchronous velocity mode
Every bus cycle must return new reference values for interpolation. You can
adjust the interval over which this occurs in
A602 Interpolation time period
. The
value in
A602
is transferred to
A291
. Note that
A291
must be set equal to
A150
or a multiple of it.
A291
,
A150
and the cycle time of the interpolation routine are used to calculate
how many individual increments a reference value difference must be
subdivided into. The interpolation routine changes the reference value for the
internal Internal one individual increment for each cycle.
If no new reference value is available yet in the first cycle after the last
individual increment, the reference value for the internal control must be
extrapolated with the previous step width. Extrapolation ends when a new
reference value is available or if the assigned maximum extrapolation time
I423
has been exceeded. In the second case the drive controller switches to device
state malfunction. The display shows the event
78:Position limit cyclic
with
cause
3:Maximum extrapolation time exceeded I423
.