User guide

ALEOS 4.3.4 Software Configuration User Guide
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Transformed Analog
The raw analog data is displayed in volts. However, that is not always the most
convenient unit of measurement to view the data. The I/O Configuration screen
enables you to transform the voltage readings to a more convenient unit of
measurement, for example degrees Celsius or Fahrenheit for temperature, liters
for volume, etc.
Step 1—Coefficient and Offset
Before you configure ACEmanager, you need to locate or calculate the coefficient
and the offset values.
Consult the user documentation for the equipment you want to monitor. It should
provide you with the coefficient to convert volts to the appropriate unit of
measurement and the offset value (the difference between the equivalent value
for 0 volts and 0), or provide information on equivalent values for voltage readings
from which you can calculate the coefficient and offset. (If this information is not
available in the user documentation, contact the manufacturer.)
For example, if the equipment monitors temperature, and has a scale from 0 volts
to 30 volts, the equipment specifications should provide information similar to the
following:
0 V is equivalent to - 20°C
30 V is equivalent to 100°C
This is expressed algebraically as follows:
where:
a = coefficient
b = offset
For this example, you can calculate a as follows:
Offset for Analog # The offset (difference) between 0 volts and the equivalent value for the desired unit of
measurement
Units for Analog # The unit of measurement used in event reporting for the parameter being monitored by
the analog input
For example: degrees Celsius, degrees Fahrenheit, liters, mm, etc.
Field Description
a 0Vb 20–=+ C
a 30Vb100C=+
a 30Vb+a 0Vb+100C 20––=–
a 30V 120V=
a 4=