CAP0.PREFILTER, CAP1.PREFILTER
General Information
Type R/W Parameter
Description Sets the filter for the precondition input source.
Units N/A
Range 0 to 2
Default Value 0
Data Type U8
See Also CAP0.FILTER, CAP1.FILTER
Start Version M_01-00-00-000
Fieldbus Index/Subindex Object Start Version
Modbus
70 CAP0.PREFILTER
96 CAP1.PREFILTER
M_01-03-00-000
Description
You can use an optional glitch filter to debounce the input trigger signals. By default the filter is disabled. A 0.6 us
filter may be selected for fast signals such as RS422, or fast opto. A 40 us filter may be selected for slow opto
inputs. Exact values for each filter mode are listed below.
Filter (if no
glitch)
Trigger Filter (filter clock enable
period)
Filter Delay (us)
Min Typ Max
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 315
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