Rockwell-automation 1771-IR Series D RTD Input Module User Manual Manual do Utilizador descarregar pdf (Página 32)

4–4 Configuring Your RTD Module

Publication 1771Ć6.5.129 - March 2000

The complete configuration block for the block transfer write to the

module is defined in below.

Configuration Block for RTD Input Module Block

Transfer Write

Dec. Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

1 Sample Time

(for RTS)

Data

Format

RTD

Type

Units of

Measure

Single channel in ohms

2 10 ohm resistance @ 25

3 Channel 1 Bias

4 Channel 2 Bias

5 Channel 3 Bias

6 Channel 4 Bias

7 Channel 5 Bias

8 Channel 6 Bias

9 Channel 1 calibration

10 Channel 2 calibration

11 Channel 3 calibration

12 Channel 4 calibration

13 Channel 5 calibration

14 Channel 6 calibration

15 Auto-calibration request word

Bit/word descriptions of BTW file words 1 (configuration), 2

(resistance value of 10 ohm copper RTDs), 3 through 8 (individual

channel bias values) and 9 through 14 (individual channel calibration

words) are presented below. Enter data into the BTW instruction

after entering the instruction into your ladder diagram.

Bit/Word Definitions for RTD Input Module

Word Bits Description

Word 1 bits 00-05 If any of these bits are set, the corresponding input channel will be

reported in ohms. If RTDs other than 10 ohm copper or 100 ohm

platinum are used you must report those channels in ohms, not

degrees. Data format on a channel displayed in ohms will default to

binary.

bits 06-07 Determines what units of measure the module reports.

Units of measure Bits 07 06

Degrees C 0 0

Degrees F 0 1

Configuring Block for a

Block Transfer Write

Bit/Word Descriptions

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 78 79

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