Calibrate the 1756-irt8i module – Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules User Manual
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Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 8
Calibrate the ControlLogix Isolated Analog I/O Modules
Calibrate the 1756-IRT8I Module
You can calibrate the 1756-IRT8I module for use with the following input types:
•
RTD (Ohms) - 3 and 4 Wire types
•
Thermocouple (mV)
Calibrate the 1756-IRT8I Module for an RTD Input Type
The 1756-IRT8I uses two precision resistors to calibrate the channels in ohms.
You connect the following:
•
1
Ω
precision resistor for low reference calibration
•
487
Ω
precision resistor for high reference calibration
The 1756-IRT8I module can operate in multiple input ranges when an RTD is
connected. However, the module calibrates only in the 1…510
Ω
range.
Follow these steps to calibrate your module.
1.
Go online with your project.
2.
Right-click the module you want to calibrate and choose Properties.
IMPORTANT
After you connect either precision resistors, we recommend that you
wait for a minimum of two minutes before proceeding to the next task
to obtain the highest calibration accuracy.
For more information, see
IMPORTANT
When you are wiring precision resistors for calibration, follow the wiring
example on
. Make sure terminals IN_x(-)/B and IN_x/RTD C are
shorted together at the RTB.
You can calibrate the module for 3-wire or 4-wire mode. Calibrate in the
mode in which the module operates.