The DNA-AO-319-420, DNR-AO-319-420 and DNF-AO-319-420 are
fully isolated, high-precision, 8-channel analog current output boards
compatible with UEI’s popular “Cube”, RACKtangle and FLATRACK I/O
chassis respectively. The boards offer full 16-bit resolution and guarantee
monotonicity over the entire operating temperature range. Each
DNx-AO-319-420 channel provides an output range of 4-20 mA (sinking).
For applications requiring a sourcing 4-20 mA output, please refer to the
DNx-AO-318-020. For applications requiring voltage outputs please refer
to the DNx-AO-308 or DNx-AO-318 series boards.
The DNx-AO-319-420 provides extensive built-in-test diagnostics. An on-
board A/D converter on each channel allows the user to monitor both
output voltage and current. A solid state relay on each output allows the
D/A channel to be disconnected from the field I/O so that a complete
board self-test can be completed without driving the circuitry connected
to the outputs. This relay automatically disconnects the D/A output in
the event of an external fault condition such as a short to ground or a DC
power supply. The output relay may also be opened to simulate an open
circuit/broken cable failure.
All 8 channels may be configured to update simultaneously, or they may
be updated one at a time as data is written. A 1024 sample FIFO allows
each D/A to be updated at 10 kHz without data loss. Note that the output
circuit only sinks current. Settling time for current increases will be low,
but settling time for current decreases is largely set by the reactance of
the sensor/cable combination (essentially a pull-up configuration).
Software included with the DNx-AO-319-420 provides a comprehensive,
yet easy-to-use API that supports all popular Windows programming
languages as well as supporting programmers using Linux and most
real-time operating systems including QNX, RTX, VXworks and more.
Finally, the UEIDAQ Framework supplies complete support for those
creating applications in data acquisition software packages such as
LabVIEW, MATLAB/Simulink or any application which supports ActiveX
or OPC servers.