Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE - Manual (Page 29)

Module Configuration
Chapter 5
5Ć5
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