Somat eDAQlite, Руководство пользователя

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Somat eDAQ
lite
138 I2773-4.
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Pulse Counter Application Note: Quadrature Encoder
This Directional Velocity channel was developed primarily to provide a signed RPM output channel using a quadrature
encoder connected to a EDIO layer. Configure one of the two pulse trains from the quadrature encoder as a pulse frequency
transducer channel to yield the unsigned velocity input channel. Define a normal quadrature decoder Pulse Counter channel
using both pulse trains to yield the position input channel. For more information on quadrature encoder inputs, see
“Pulse
Counter” on page 111 .
7.2.7 State Mapper
The State Mapper channel maps the input channel into a discrete state output channel
based on a set mapping conditions defined in an ASCII file. Define each mapping
condition in terms of a minimum input value, a maximum output value, and the
associated output state value. The number of mapping conditions must be 32 or less.
The ASCII file should be a line-based file with the three ordered entries per line
separated by spaces or tabs.
NOTE
The State Mapper channel can consume significant eDAQ
lite
computational
resources depending on the sample rate and the number of mapping conditions
defined.
State Mapper Example: Angular Position
Consider mapping an input channel that generates angular position in the range of 0 to 360 degrees into an output channel
that specifies which 60 degree sector the input channel is in. Use the following mapping conditions where
x
is the input and
y is the output.
One way to write the ASCII file for this example is as follows.
0 60 1
60 120 2
120 180 3
180 240 4
240 300 5
300 360 6
Input Channel
The input channel data type must be 32-bit float.
Output Data Type
The output channel data type is 32-bit float.
HBM: public