Horner-apg SmartStack I/O HE-THM100 Uživatelský manuál stáhnout pdf (Strana 4)

PAGE 4 10 NOV 2006 MAN0237-09

THM000/100

This Data Sheet is published individually & also as a part of the SmartStack Supplement (SUP0246-05).

Information is subject to change without notice. SmartStack is a trademark of Horner APG, LLC.

4 INPUT AND OUTPUT CONVERSIONS

For a given module configuration, use the appropriate formula in the table to obtain the actual

temperature (°C or °F) that is represented by the value in the %AI register.

Temperature Conversion

Thermocouple

Configuration

Celsius Fahrenheit

0.05°

°C = %AI / 20

* °F = %AI / 20 *

0.1° °C = %AI / 10 ** °F = %AI / 10 **

0.5° °C = %AI / 2 °F = %AI / 2

* Maximum reading in 0.05°F or 0.05°C format is limited to 1638.3 because of %AI

resolution.

** Maximum reading in 0.1°F or 0.1°C format is limited to 3276.7 because of %AI

resolution.

The following table describes how real-world inputs are scaled into the controller. Given a known input

voltage, the data value is configured by using the conversion factor from the table. The following formula

is used: Data = Voltage In (Vin) / Conversion Factor

Example: The user selects a voltage of 25mV.

1) The known input voltage is 25mV.

2) Using the table, the conversion factor for the voltage range of ± 25mV is 0.00078125.

3) To determine the data value, the formula is used:

Data = Vin / Conversion Factor

32000 = 25mV / 0.00078125

Conversion of Real-World Inputs to the Controller

%AI Value

Selected

Voltage Range

Voltage In

(Vin) VDC

Data Out

Conversion

Factor

-25mv -32000

0 0

± 25mv

+25mv +32000

0.00078125

-50mv -32000

0 0

± 50mv

+50mv +32000

0.0015625

-100mv -32000

0 0

± 100mv

+100mv +32000

0.003125

1 2 3 4 5 6 7 8

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