Advantech Data Acquisition Modules ADAM 4000 Manual do Utilizador descarregar pdf (Página 381)

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101

Appendix B

Appendix B Data Formats and I/O Ranges B

-5

Thermocouple

Type

Temperature Range

(Degrees)

Temperature Range

(Hex)

J 0° C to 760° C 0000h - 7FFFh

T -100° C to 400° C E000h - 7FFFh

R 500° C to 1750° C 2492h - 7FFFh

The given span of the specified range is used to determine the RTD

input ranges for twos complement hexadecimal values. For an example,

if the nickel RTD is specified for the range -80

C to +100

C, the

corresponding values in hexadecimal notation would be 8000h to

7FFFh.

B.1.4 Ohms

To indicate ohms, set bits 0 and 1 of the data

format/checksum/integration time parameter to 11. This data format is

only valid for ADAM-4013 analog input module.

The ohms format allows you to read the value of the RTD resistance in

ohms. It consists of a “+” or “-” sign followed by five decimal digits

and a decimal point. The resolution (position of the decimal point) of

Platinum-Nickel RTDs is 10 m Ω. (two decimal places).

For example, a 100 Ω platinum RTD specified for -100

C to +100

has +100

C corresponding to +138.50 Ω and -100

C corresponding to

+060.60 Ω.

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