Signal Edge Evaluation (1X, 4X) - Siemens SINAMICS S120 Function Manual
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- Function manual (1094 pages) ,
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Basic functions
6.19 Tolerant encoder monitoring
6.19.9
Signal edge evaluation (1x, 4x)
The "signal edge evaluation" function allows square-wave encoders with higher production
tolerances or older encoders to be used. Using this function, a "steadier" actual speed value
is calculated for encoders with an uneven pulse duty factor of the encoder signals. As a
consequence, you can keep the old motors together with the encoders - for example when
modernizing plants.
Commissioning
1. Sets parameters p0437 bit 4 and bit 5 as follows to activate "signal edge evaluation":
Sequence
1. For the 4x evaluation, both the rising and falling edges of a contiguous pulse pair on the
2. For the 1x evaluation, only the first or the last edge of a contiguous pulse pair on the A
3. A 4x evaluation of the pulse encoder signals allows a minimum speed to be detected
4. The following formula defines the lowest speed where a distinction can be made to 0:
Note
You can only use the reduction to 1x evaluation in conjunction with the edge zero mark or
without zero mark. Detection with an accuracy of one pulse is no longer possible for zero
marks with "unambiguous range" or distance-coded zero marks.
332
p0437.4
0
0
1
1
A and B tracks are evaluated.
and B tracks are evaluated.
which is a factor of 4 lower than for the 1x evaluation. For incremental encoders with
uneven pulse duty factor of the encoder signals or where the encoder signals are not
precisely offset by 90°, a 4x evaluation can result in an actual speed value that is
somewhat less steady.
n_min = 60 / (x*p0408) [rpm]
with x = 1 or 4 (x times evaluation)
p0437.5
0
1
0
1
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Evaluation
4 x (factory setting)
Reserved
1 x
Reserved
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