Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: 248-295-0880
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http://www.acromag.com
- 21 -
https://www.acromag.com
Configuration
…
continued
HELP
–
You can press
[F1]
for Help on a selected or
highlighted field or control. You can also click the
[?]
button in the upper-right hand corner of the screen
and click to point to a field or control to get a Help
message pertaining to the item you pointed to.
If the scaled input/output zero and full-scale points
are chosen too close together, performance will be
degraded.
Ranges indicated are nominal and may be rescaled to the output,
such that you may use only a portion of the input range to drive
the transmitter current or voltage output. Because rescaling it
smaller will proportionally decrease its resolution, you should be
careful to avoid going smaller than 12-bits to achieve rated
performance. Each halving of the nominal range will reduce
resolution by 1 bit. Decreasing range resolution can magnify
error, especially noticeable for very small input ranges which
degrade the input signal-to-noise ratio and the resolution of the
analog-to-digital input conversion.
Select the Input Filtering
…
You may select the level of digital filtering to apply to the input
channel as Low, Medium, High, or None (No digital filtering). The
respective I/O response times are indicated in parenthesis next to
your filter selection. Always set the input filter as desired before
calibrating an input. Note that higher filter levels result in lower
average noise, but with slower I/O response times.
Set the Scaled I/O Sub-Range Zero & Full-Scale Endpoints
…
You may rescale a selected input and/or output range differently
for each channel and use a smaller portion of their nominal
ranges to drive an input to the output. Be careful as you scale
ranges not to reduce the nominal range too much, as resolution
will be proportionally diminished and I/O channel noise/error will
be magnified (each halving of the nominal range reduces its
respective resolution by 1 bit).
In the Input Scaling fields for input and output, set the input
signal minimum/zero value inside its full range to correspond to
the output range minimum/zero value (4mA). Set the input
signal maximum/full-scale value inside its full range to
correspond to the output range maximum/full-scale value
(20mA). You can optionally swap input levels to configure a
reverse acting output response if you desire. Note that some
under and over-range is built into every I/O range selection and
these limits vary by range.
Select the Output Limits...
Two-Wire transmitter channels drive current. You can set your
own Minimum and Maximum linear operating range limits, or
you may select Namur limits of 3.7mA and 21.7mA. By setting
range limits inside the a widest possible range from 3.5mA to
24mA, you can discern a valid high or low input signal from a
range fault (broken lead or open sensor).
Once you have made your configuration selections, click
[Send
I/O Config]
to write them to the module. Read the Status of your
configuration transmission in the “Status” field. Alternately, you
may click
“
F
ile”
in the upper left corner to save your
configuration settings to a file on your PC, for later reference.