7 PICOSCALE CONTROL GUI
7.5.3 Calculation System
Figure 7.18: Configuration Menu of the Calculation System.
Within the
Calculation System
you can perform basic calculations with data sources. Up to eight
calculation systems can be configured with the
Calculation Systems
drop-down menu in the upper
left part of the window..
First, you can de
fi
ne up to four operands (1.1
–
1.4). Each operand can
be a constant, a position/velocity/acceleration value from one of the three
PICO
SCALE
channels,
an ADC value, a data source value from the environmental module (temperature, pressure or
humidity), signal generator outputs or a counter value. Then, you can sum up the four channels
or the minimum or maximum value can be calculated as de
fi
ned in the grey
Operator 1
box.
I
f, for
instance, a subtraction is required, the
Negate Output
button can be activated in order to multiply
an operand by -1 before performing the summation. The exact same operations can be performed
with a second branch of data by de
fi
ning operands 2.1
–
2.4 and
Operator 2
.
I
n the third stage, the
results of
Operator 1
and
Operator 2
can be processed with
Operator 3
, resulting in a
Calc Sys
Result
.
Operator 3
allows summation, subtraction, multiplication, division or Max/Min operation.
Alternatively, the inputs of
Operator 3
can be set to a
fl
oat constant or the
Calc Sys Result
of another
calculation system.
I
n the exemplary operation as shown in
fi
gure 7.18 the calculation is set up to give
Calc Sys Result
=
Position 1
−
Position 2
12000000000
.
By default, the result is simply forwarded to the 64 bit
Calc Sys Output
. However, it is possible to
map the result to a speci
fi
c value de
fi
ned by a lookup-table (LUT). Note that in this case, the cal-
culation system result has to be in the range of [-1,1]. Results outside this range will be truncated.
The lookup-table needs to have 12 bit resolution (and thus has a length of 2
12
=4096 points). The
result is interpolated based on those 4096 points to again give a 64 bit resolution. User de
fi
ned
LUTs can be uploaded as CSV
fi
les in the
Custom Shapes
panel. (Decimal sign is "." and the 4096
individual entries have to be separated by a line break.) Once a calculation system is con
fi
gured,
it can be stored in con
fi
guration slots for later usage by using the
Module Configurations
button.
69
PicoScale User Manual
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