CAP0.FILTER, CAP1.FILTER
General Information
Type R/W Parameter
Description Sets the filter for the capture source input.
Units N/A
Range 0 to 2
Default Value 0
Data Type U8
See Also CAP0.PREFILTER, CAP1.PREFILTER
Start Version M_01-00-00-000
Fieldbus Index/Subindex Object Start Version
Modbus
60 CAP0.FILTER
86 CAP1.FILTER
M_01-03-00-000
Description
An optional glitch filter may be used to debounce the input trigger signals. By default the filter is disabled. A 0.6
µs filter may be selected for fast signals such as RS422, or fast opto. A 40 µs filter may be selected for slow
opto inputs. Exact values for each filter mode are listed below (the precondition logic has an identical filter).
Filter Mode (if no
glitch)
Trigger Filter (filter
clock enable
period)
Filter Delay
Min
(µs)
Typical
(µs)
Max (µs) (µs)
off 0 N/A N/A N/A N/A
(default) 0 0 0 N/A N/A
fast 1 0.56 0.6 0.64 0.80
slow 2 35.84 38.4 40.96 5.12
The filter uses seven stages of delay when enabled. An input glitch restarts the filter delay. The clock enable
period for the seven stage filter is set to 0.080 us for the fast filter, 5.12 us for the slow filter. The filter delay for a
clean input edge is therefore an average of 7.5 periods (+/-0.5 period for worst case).
Related Topics
8.11 Using Position Capture
AKD User Guide | CAP Parameters
Kollmorgen | December 2010 311
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