X-317™ Users Manual
Configuration and Setup
Page
display descriptive and easy to use. The units settings are for display only and are not used in
the calculations for setting the digital to analog converter.
Decimal Places
This setting determines how many digits are shown to the right of the decimal point for the data
values shown on the
Control Page
. This setting controls only how the data is displayed and does
not affect the calculations for setting the digital to analog converter.
User Input Max & User Input Min
The analog output settings are made in user friendly engineering units such as V, M, Ft, KPH, %.
Internally the X-317 automatically scales the output settings with a linear Y=mX+b function before
setting the digital to analog converter. The default settings are m=1 and b=0 which provide no
scaling and a 1 to 1 output relationship. For example, with the default settings, setting the output to
2.0 will result in the analog output being 2.0Volts. When the X-317 is controlled via ModBus/TCP
from a PLC or other device it may be convenient to leave the default settings undisturbed such that
no data scaling is done in the X-317 and any math or other calculations are done in the PLC or
controlling device.
If you wish the X-317 to scale and process the output settings, use the
User Input Max
and
User
Input Min
fields to provide information for the internal calculations. The X-317 automatically
computes the slope and offset settings with the data entered. The settings are made by entering
two data points (X1,Y1) and (X2,Y2). The slope is calculated as “(Y2-Y1/X2-X1)”. The Y1 and Y2
output values must be within the range selected by the
Mode
setting (0-5V, 0-10V, ±5V, ±10V and 4-
20mA). The input format is:
User Input Max: X2, Y2
User Input Min: X1, Y1
For example, a conveyor motor is to be controlled by a 4-20mA loop with 4mA=10fpm and
20mA=50fpm. Make the following settings to control the conveyor in units of feet per minute (fpm).
User Input Max: 50fpm, 20mA
User Input Min: 10fpm, 4mA
With these settings, setting the analog output to 10fpm will cause the digital to analog converter to
output 4.0mA and a setting of 50fpm will result in a 20mA output. Setting the analog output to a
value between 10fpm and 50fpm will result in a proportional output between 4mA and 20mA.
With another example, a damper motor is to be controlled by a 2 to 10V signal with 2V=closed and
10V=open. Make the following settings to control the damper position in units of % open.
User Input Max: 100%,10V
User Input Min: 0%, 2V
Note the data scaling can process a negative slope. To reverse the operation of the damper motor
in the example above, make the following settings:
User Input Max: 100%, 2V
User Input Min: 0%, 10V
After making these settings (and clicking the
submit
button), go to the
Control Page Setup
tab and
click the
Display Raw Analog Outputs
box. Then go to the
Control Page
and experiment with your
settings. Set the output to the max and min engineering values and make certain the digital to
analog converter outputs the expected values.
Xytronix Research & Design, Inc.
Page 31
Summary of Contents for ControlByWeb X317
Page 1: ......
