Rockwell Automation 1771-IR Series D RTD Input Module User Manual - Manual (Page 40)

6–2 Calibrating Your Module
Publication1771Ć6.5.129 - March 2000
Calibration of the module consists of applying 1.00 ohm resistance
across each input channel for offset calibration, and 402.00 ohm
across each input channel for gain correction.
Offset Calibration
Normally all inputs are calibrated together. To calibrate the offset of
an input, proceed as follows:
1. Connect 1.00 ohm resistors across each input channel as shown in
Figure 6.1.
Figure 6.1
Resistor Location for Offset Calibration
18
16
14
12
10
8
6
4
2
C
B
A
C
B
A
C
B
A
C
B
A
C
B
A
C
B
A
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Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Terminal
Identification
1.00 ohm Resistor
Repeat for
each
channel
2. Apply power to the module.
3. After the connections stabilize, request the offset calibration by
setting bit 00 in block transfer write word 15 and sending a block
transfer write to the module. Refer to the table below.
Performing
Auto-calibration