Custom Translation Tables; Procedure - Automated Logic T-Line Series Technical Instructions

6. Verify the input by measuring the voltage between
the GND terminal of the analog input and the
positive terminal. The input voltage for thermistors
should be between 0 and 5 V.
7. Enter the channel number, offset, and gain on the
T-Line zone FB parameter page as listed in the
"Channel Number" section.

Custom Translation Tables

In addition to the inputs already mentioned, it is possible
to create custom translation tables for non-standard
thermistor or slidepot inputs. Provided on the parameter
page of the TNI module driver are two user-definable
tables for translating these inputs.
The following are typical applications for the custom
translation tables:
• Thermistors other than Type 2 (such as Type 3).
• Slide potentiometer inputs.
• Non-linear voltage inputs (0-5 VDC maximum
range).
These tables use a 10 point linear translation method to
approximate a non-linear curve of resistance or voltage to
the desired units.

Procedure

1. Display the TNI module driver parameter page
(FB #15).
2. For thermistor, slidepot, and other resistance inputs
set the option "Is input specified in voltage?" to NO.
For voltage inputs, set the option to YES.
3. Determine the accuracy and range needed. Note the
following:
• Values which lie between two defined entries are
interpolated linearly by the FB.
• The first and last entries of the resistance table
should always be set to zero and infinity (32767
x 10 represents infinity) in the event that the
sensor should short or open. In the case of
voltage inputs, the first and last input voltages
should be set to zero and 5 V. These are the
default values.
Rev. (29-JUN-99) • TNI v4.7
Input Ohms
0 x 10
230 x 10
405 x 10
752 x 10
935 x 10
1172 x 10
1478 x 10
1879 x 10
2406 x 10
7032 x 10
32767 x 10
Figure 24: Example Custom Table for a Precon Type 3
Thermistor Sensor
4. Determine the resistance or voltage at the desired
settings. This information may be obtained either
from manufacturer reference tables or through
testing.
5. Select a custom translation table that is not currently
in use. Record the custom gain from this table for
use when defining inputs which will use the custom
translation table in the module.
6. Enter the scaled voltage or resistance input on the
left and then enter the corresponding value on the
right (see Figures 24 and 25 for examples).
The resistance values of the slidepot in Figure 25
(left column) were obtained by measuring the
Input Ohms
0 x 10
474 x 10
607 x 10
910 x 10
1210 x 10
1540 x 10
1860 x 10
2150 x 10
2360 x 10
2400 x 10
32767 x 10
Figure 25: Example Custom Table for a Sample
Slidepot Installed in Place of RSZ+
(Tested Resistance Entered on the Left)
©1995-99 Automated Logic Corporation
18
Input Value
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms = -60.8
Input Value
Ohms = -1.00
Ohms = -1.00
Ohms = -0.75
Ohms = -0.50
Ohms = -0.25
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
Ohms =
300
150
120
90
80
70
60
50
40
0
0.00
0.25
0.50
0.75
1.00
1.00