Horner-apg XLt OCS HE-XT103-10 Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAN0871-02 21 AUGUST 2007 PAGE 3

Specifications / Installation XLT103-10

5 Analog Conditioning

5.1 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-XT103-10 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.

5.2 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

%R3 = (((%R11*%R1+%R13)*%R1+%R15)*%R1+%R17)

4. Perform the Real Math Expression %R5 =

(((%R3*%R1+%R19)*%R1+%R21)*%R1+%R23)*%R1+%R25

5. Load %R0005 result into another register such as %R0007 to save the temperature

value.

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 for an example file

containing the above program.

5.3 Thermistor types

The HE-XT103-10 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

6 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.

Registers PWM HSC Stepper

%AQ1

Start

Frequency

%AQ2

PWM1 Duty

Cycle

(32 bit)

HSC1

Preset

Value

Run

Frequency

%AQ3

%AQ4

PWM2 Duty

Cycle

(32 bit)

HSC2

Preset

Value

Accel Count

(32 bit)

%AQ5

%AQ6

PWM Prescale

(32 bit)

Run Count

(32 bit)

%AQ7

%AQ8

PWM Period

(32 bit)

Decel Count

(32 bit)

%Q1 Run

%I30 Ready/Done

%I31

Error

10040 8020

100

Scans0

2 3 4 5 60 7

%Complete [ ]

Filter

Constant

1 2 3 4

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