Power Brick Controller User Manual
Connections and Software Setup
86
The effective resolution of the analog output circuitry is about ~13.5 bits (±13380 software counts) spanning
over the full output range of ±10 VDC (saturates at about ~10.5 Volts). Writing to the user defined
DACnXxxInBits
pointer produces the following voltage output:
DACnXxxInBits Single Ended [VDC] Differential [VDC]
-13380
-10
-20
0
0
0
13380
+10
+20
Note
The output voltage is measured between AGND and DAC+ in single-
ended mode. And between DAC- and DAC+ in differential mode.
Scaled DAC Output (In Volts)
The outputs can be scaled and converted into “user” voltage units. The following example PLC scales the
data as needed to allow the user to command the output in units of volts:
The global parameter(s)
DACnXxxZeroOffset
represents the voltage offset (as seen on a digital
multi-meter or scope) when an output of zero is commanded. This is user adjustable.
The global parameter
DACnXxxCtPerVolt
acts a software adjustment pot which the user can
calibrate for at the rails (±10 VDC) of the output.
The global parameter
DACnXxxVolts
is the output command in volts
Where
n
is the DAC channel number (1 or 2) of the corresponding
xx
connector (X9, X10, X11, or X12).
