Rockwell Automation 1771-IR Series D RTD Input Module User Manual User Manual
Page 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
o
C
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