Rockwell Automation 1771-IR Series D RTD Input Module User Manual - Manual (Page 30)

4–2 Configuring Your RTD Module
Publication 1771Ć6.5.129 - March 2000
You must indicate what format will be used to read data from your
module. Typically, BCD is selected with PLC–2 processors, and
binary (also referred to as integer or decimal) is selected with PLC–3
and PLC–5 processors. See below and Appendix C for details on
Data Format.
Selecting Format for Reading Data
Decimal Bit 10
Octal Bit 12
Decimal Bit 9
Octal Bit 11
Data Format
0 0 BCD
0 1 2's complement binary
1 0 Signed magnitude binary
1 1 Same as signed magnitude binary
The RTD input module accepts the following types of RTD inputs:
RTD Temperature Range Indication Word 1,
Bit 10
Ohms o C o F
Platinum -200 to +870 o C (-328 to 1598 o F) Underrange 0 1.00 -200 -328
Overange 600.00 870 1598
Copper -200 to +260 o C (-328 to 500 o F) Underrange 1 1.00 -200 -328
Overrange 327.67 260 500
The units of measure reported by the RTD module are selected by
setting bits 06–07 in BTW word 1.
Units of Measure
Bit
07 06
Degrees C 0 0
Degrees F 0 1
Ohms 1 0
Not used 1 1
If any of bits 0–5 are set (1), the corresponding input channel will be
reported in ohms.
Data Format
RTD Type
Units of Measure