Rockwell Automation 1794-IRT8XT FLEX I/O Thermocouple/RTD /Millivolt Input Module User Manual User Manual
Page 60
Publication 1794-6.5.12 - September 2011
48
Calibrate Your Module
3. Initiate a write to the module with 2401 (hex) value in EDT command
location (word 3, bits 00…15), as shown, for calibrating all channels at
once. For individual channel calibrations, use the 04X1 (hex) (0401,
0411, 0421, ...0471 hex).
4. Monitor the EDT response location (read word 10, bits 00…15) for an
echo of the EDT command.
If the EDT response word reads 80FF (hex), repeat step 3. Make sure to
allow for sufficient time for the module to respond to your request. If
there is no change, calibration has failed. Check the wiring and try again.
5. Connect a 100
Ω
, 0.01% resistor across (H, +) and (L, -) of each input
channel (8 resistors). Repeat steps 3 and 4 using the EDT command
value of 2402 (hex) for calibrating all channels at once. For individual
channel calibrations, use the 04X2 (hex) (0402, 0412, 0422, ...0472 hex).
When all calibrations are successful, proceed to the Cold Junction Calibration
on page 47.