National Instruments NI EDIDS-2400 Series, User Manual, Page: 168 / 314

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Pattern Type
EPT Type
Selections
Pattern Description
N - M EPT N-M 7
N-M patterns have N evenly spaced teeth
and M missing adjacent teeth (gap) on the
crankshaft trigger wheel. M is limited to 1
or 2 missing teeth. N is stated in terms of
evenly spaced teeth, as if there were no
missing teeth. For example, a 60-2 pattern
would consist of 58 physical teeth followed
by two missing teeth. EPT N-M function can
be configured to track 360 or 720 degrees
depending upon an optional camshaft input.
When tracking 360 degrees for 2-stroke
engines, the camshaft input is ignored. When
tracking 720 degrees for 4-stroke engines,
the camshaft input signal must be TRUE
during every other crank tooth gap. The cam
signal can be manipulated using the offset and
extend functions to satisfy this requirement.
N + 1 EPT N+1 9
N+1 patterns have N evenly spaced teeth
and a single additional tooth (Plus1), placed
between two evenly spaced teeth, on the
crankshaft trigger wheel. The Plus1 tooth can
be located at one of two different positions
between two evenly spaced teeth, advanced or
retarded. N is stated in terms of evenly spaced
teeth, as if there were no additional teeth.
For example, a 6+1 pattern would consist
of 6 physical evenly spaced teeth and an
additional physical tooth placed between two
evenly spaced teeth. EPT N+1 function can
be configured to track 360 or 720 degrees
depending upon an optional camshaft input.
When tracking 360 degrees for 2-stroke
engines, the camshaft input is ignored. When
tracking 720 degrees for 4-stroke engines, the
camshaft input signal must be TRUE during
every other Plus1 tooth. The cam signal can
be manipulated using the offset and extend
functions to satisfy this requirement.
Encoder
EPT Enc 2
EPT Enc 4
Encoder patterns have N evenly spaced teeth
on the crankshaft with a separately sensed
single reference (index) tooth on the crankshaft
or camshaft. The rising edge of the reference
must occur between the same two crankshaft