Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module - Manual (Page 25)

Rockwell Automation Publication 1769-UM005B-EN-P - March 2012 25
Quick Start for Experienced Users Chapter 2
· Refer to Industrial Automation Wiring and Grounding Guidelines,
publication
1770-4.1 , for additional information.
RTD Wiring Considerations
· The module requires three wires to compensate for lead resistance error.
· If using a 3-wire configuration for module connections, select cable to
ensure that lead wire resistances match as closely as possible. Consider
the following:
– To ensure temperature or resistance value accuracy, the resistance
difference of the cable lead wires must be less than or equal to
0.01
Ω..
– Keep lead wire resistance as small as possible and less than 25
Ω .
– Use quality cable that has a small tolerance impedance rating and
consistent impedance throughout its length.
– Use a heavy gauge lead wire with less resistance per foot.
Terminal Connections
For examples of RTD and resistance device wiring see Wiring RTDs on page
41 and Wiring Resistance Devices (Potentiometers) on page 42.
EXC 0
EXC 3
SENSE 0
SENSE 3
RTN 0
RTN 3
EXC 1
EXC 4
SENSE 1
SENSE 4
RTN 1
RTN 4
EXC 2
EXC 5
SENSE 2
SENSE 5
RTN 5
RTN 2
1769-IR6
Step 4: Configure the module. Reference
Chapter 4
(Module Data, Status, and
Channel Configuration)