Horner-apg XLt OCS HE-XT102-14 Manual de usuario descargar pdf (Pagina 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

10040 8020

100

Scans0

2 3 4 5 60 7

%Complete [ ]

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.

1 2 3 4

XLT OCS Model: HE-XT102-14 1
12-24VDC 2

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