Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario descargar pdf (Pagina 29)

Module Configuration

Chapter 5

55

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.

Table 5.D

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

Ohms 1 0

Not used 1 1

bit 10 In temperature mode:

0 = Entire module is platinum

1 = Entire module is 10 ohm copper. Enter exact value in word 2.

In ohms mode:

0 = 30mohm/count resolution

1 = 10mohm/count resolution

bits 11-12 Data format bits tell module which format to use for reporting input

values to processsor

Format Bits 12 11

4-digit BCD 0 0

2's complement binary 0 1

Signed magnitude (binary) 1 0

Not used 1 1

bits 13-17 Real time sample bits. See Table 5.B.

Sample Time 17 16 15 14 13

0.1 0 0 0 0 1

0.5 0 0 1 0 1

0.6 0 0 1 1 0

0.7 0 0 1 1 1

0.8 0 1 0 0 0

0.9 0 1 0 0 1

1.0 0 1 0 1 0

Bit/Word Descriptions

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 67 68

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