Horner APG XLt OCS HE-XT102-14 - Manual (Page 3)

MAN0867-01-EN Specifications / Installation
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3/26/2009 Page 3 of 4 ECN # 956
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-XT102-14 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-XT102-14 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
60
20
100 40 80 20
0
10
100
90
80
70
60
50
40
30
Scans 0
1 2 3 4 5 6 0 7
%
C
o
m
p
let
e
[
]
Filter
Constant 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 Safety
When found on the product, the following symbols specify:
Warning: Electrical
Shock Hazard.
Warning: Consult
user documentation.
This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or Non-hazardous
locations only
WARNING – EXPLOSION HAZARD
– Substitution of components may impair suitability for Class I,
Division 2
AVERTISSEMENT - RISQUE D'EXPLOSION
- LA SUBSTITUTION DE COMPOSANTS PEUT RENDRE
CE MATERIAL INACCEPTABLE POUR LES EMPLACEMENTS DE CLASSE 1, DIVISION 2
WARNING – EXPLOSION HAZARD
– Do not disconnect equipment unless power has been switched off
or the area is known to be non-hazardous.
AVERTISSEMENT - RISQUE D'EXPLOSION
- AVANT DE DECONNECTOR L'EQUIPMENT, COUPER
LE COURANT OU S'ASSURER QUE L'EMPLACEMENT EST DESIGNE NON DANGEREUX.
WARNING:
To avoid the risk of electric shock or burns, always connect the safety (or earth) ground
before making any other connections.
WARNING:
To reduce the risk of fire, electrical shock, or physical injury it is strongly recommended to
fuse the voltage measurement inputs. Be sure to locate fuses as close to the source as possible.
WARNING:
Replace fuse with the same type and rating to provide protection against risk of fire and
shock hazards.
WARNING:
In the event of repeated failure, do not replace the fuse again as a repeated failure indicates
a defective condition that will not clear by replacing the fuse.
WARNING:
Only qualified electrical personnel familiar with the construction and operation of this
equipment and the hazards involved should install, adjust, operate, or service this equipment. Read and
understand this manual and other applicable manuals in their entirety before proceeding. Failure to
observe this precaution could result in severe bodily injury or loss of life.