AvaRaman Operating manual AvaSoft Raman 7.3 November 2008

The box shows 16 values, corresponding with a minimum and
maximum threshold value for the 8 history channels. All 16 values
can be edited by clicking them with the mouse. In addition, in the
third column, you can select whether or not to invert the signal
that is output. For each channel, the minimum threshold value may
not exceed the maximum threshold value. You cannot leave fields
blank, in that case, enter 0.
After selecting OK, the settings are written to a binary file called
‘digital.ini’.
The minimum and maximum threshold values are indicated in the
history graphs with horizontal lines.
If ‘Invert’ is not selected, the corresponding output pin will be set
high if the history channel output value lies between the minimum and maximum value. It will be
set low if the history channel output value exceeds the maximum value OR is smaller than the
minimum value.
If ‘Invert’ is selected, the corresponding output pin will be set high if the history channel output
value exceeds the maximum value OR is smaller than the minimum value. It will be set low if the
history channel output value lies between the minimum and maximum value.
If you want to monitor both
threshold values, you can assign
two (identically configured) history
channels.
To monitor a single level, set one
threshold value to the desired
level, and the other one to a value
that is out of range, e.g. Min to –
99999999 and Max to 1000, or Min
to 2000 and Max to 99999999.
That way, you will only need a
single channel per threshold value.
An example of running the History
Channel functions together with the
Process Control application is
shown in the figure at the right.
In this example, two History Channel functions were defined. The threshold values for function F1
were set at 99.5 and 100.5 percent transmittance, for function F5 at 0 and 58. These values are
represented by the horizontal lines in the graphs.
If you need 16 outputs (for setting minimum and maximum thresholds per history channel
separately), then an additional digital card is required. AvaSoft supports the PCI-6503 for this
purpose.
To convert the History Channel Functions output to an analog output signal, a DA card is available.
AvaSoft supports the PC-AO-2DC card for this purpose (2 analog outputs, 8 digital)
62 AvaRAMAN manual.doc Nov-08
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