
PAGE 4 21 AUGUST 2007 MAN0864-02
HE-XT102-10 Specifications / Installation
7 Analog Conditioning
7.1 Filter
Filter Constant sets the level of digital filtering according to the
following chart.
Digital Filtering. The illustration above demonstrates the effect of
digital filtering (set with Filter Constant) on module
response to a temperature change.
It is recommended that the filter constant for the HE-XT102-10 be set
to a value of 7. This will minimize noise and jitter, improve effective
resolution, and provide adequate speed for most temperature monitor
and control applications.
7.2 Thermistor Linearization
Thermistors are measured using a half-bridge circuit that exhibits
variable resolution and the associated increased measurement
range.
Temperature, degrees C Resolution, degrees C
-55 1.05
-35 0.36
-15 0.17
5 0.11
25 0.1
45 0.13
65 0.22
85 0.30
105 0.55
125 0.85
145 1.35
Best resolution is at 25°C, 77°F. With a constant 0.1°C resolution
circuit, the measurement range would only extend from –26°C to
+76°C.
Linearization must be performed by the user in the ladder application
code, using 26 internal %R registers per channel. The example
below uses %R1-26 to linearize one channel - %AI1. Linearization
consists of the following example steps.
1) Load the desired linearization coefficients into a table on
First Scan using a Move Constant Data block.
Registers (Real) Degrees C Degrees F
R0011 -1.94454e-028 -3.50017e-028
R0013 2.40268e-023 4.32483e-023
R0015 -1.24101e-018 -2.23381e-018
R0017 3.46655e-014 6.23979e-014
R0019 -5.69403e-010 -1.02493e-009
R0021 5.62368e-006 1.01226e-005
R0023 -0.0353121 -0.0635617
R0025 163.878 326.981
2) Load %AI0001 into %R0001 as a Real.
3) Perform the Real Math Expression
4) %R3 = (((%R11*%R1+%R13)*%R1+%R15)*%R1+%R17)
5) Perform the Real Math Expression %R5 =
(((%R3*%R1+%R19)*%R1+%R21)*%R1+%R23)*%R1+
%R25
6) Load %R0005 result into another register such as
%R0007 to save the temperature value.
7) Steps 2 though 5 can be on a single rung.
The expression rung may be copied, substituting %AI0002 and %R00011 for %AI0001 and
%R0007, and used to linearize the second channel. Contact Horner APG Technical Support
for an example file containing the above program.
7.3 Thermistor types
The HE-XE102-10 with the given example ladder code supports Kele Engineering Precon Type III, 10 KΩ
thermistors. It also directly supports the following 10 KΩ (Beta=3574) thermistors from Yellow Springs
Instruments (YSI).
44006 46006
44106 46031
44406 46041
44031 44907
45006 44908
8 I/O Register Map
Registers
Description
%I1 to %I12 Digital Inputs
%I32 Output Fault
%I25 to %I31 Reserved
%Q1 to %Q16 Digital Outputs
%Q17 Clear HSC1 accumulator to 0
%Q18
Totalizer: Clear HSC2
Quadrature 1-2: Accumulator 1
Reset to max – 1
%Q19 Clear HSC3 Accumulator to 0
%Q20
Totalizer: Clear HSC4
Quadrature 3-4: Accumulator 3
Reset to max – 1
%Q21 to %Q32 Reserved
%AI1 to %AI4 Analog inputs
%AI5, %AI6 HSC1 Accumulator
%AI7, %AI8 HSC2 Accumulator
%AI9, %AI10 HSC3 Accumulator
%AI11, %AI12 HSC4 Accumulator
%AQ9 to %AQ14 Analog outputs
%AQ1, %AQ2 PWM1 Duty Cycle
%AQ3, %AQ4 PWM2 Duty Cycle
%AQ5, %AQ6 PWM Prescale
%AQ7, %AQ8 PWM Period
Note: Not all XLT units contain the I/O listed in this table.
9 Technical Support
For assistance and manual updates, contact Technical Support at the following locations:
North America:
(317) 916-4274
www.heapg.com
Europe:
(+) 353-21-4321-266
www.horner-apg.com
10 Safety Precautions for Installation and Connections to XLe
60
20
10040 8020
0
10
100
90
80
70
60
50
40
30
Scans0
1
2 3 4 5 60 7
%Complete [ ]
Filter
Constant
All applicable codes and standards need to be followed in the installation of this
product.
Adhere to the following safety precautions whenever any type of connection is
made to the module:
9 Connect the safety (earth) ground on the power connector first before making
any other connections.
9 When connecting to electric circuits or pulse-initiating equipment, open their
related breakers.
9 Do not
make connections to live power lines.
9 Make connections to the module first; then connect to the circuit to be monitored.
9 Route power wires in a safe manner in accordance with good practice and local
codes.
9 Wear proper personal protective equipment including safety glasses and
insulated gloves when making connections to power circuits.
9 Ensure hands, shoes, and floor are dry before making any connection to a power
line.
9 Make sure the unit is turned OFF before making connection to terminals.
9 Make sure all circuits are de-energized before making connections.
9 Before each use, inspect all cables for breaks or cracks in the insulation.
Replace immediately if defective.
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