Rockwell Automation 1771-IXHR , D17716.5.80 HIGH RESOL.THERMOCOUPLE - Manual (Page 36)

Module Calibration
Chapter 7
7Ć2
Calibration of the module consists of applying 0.000mV across each input
channel for offset calibration, and +100.000mV 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. Apply power to the module.
2. Connect shorting links, or apply 0.000mV across each input channel on
the 1771–WI field wiring arm as shown in Figure 7.1.
Figure 7.1
Shorting Inputs for Offset Calibration
1
Do not
use
18 Input 1 (+ lead)
17 Input 1 (- lead)
16 Input 2 (+ lead)
15 Input 2 (- lead)
14 Input 3 (+ lead)
13 Input 3 (- lead)
12 Input 4 (+ lead)
11 Input 4 (- lead)
10 Not Used
9 Not used
8 Input 5 (+ lead)
7 Input 5 (- lead)
6 Input 6 (+ lead)
5 Input 6 (- lead)
4 Input 7 (+ lead)
3 Input 7 (- lead)
2 Input 8 (+ lead)
1 Input 8 (- lead)
Terminal Identification
Terminal Function
Wiring Arm
Cat. No. 1771-WI
18
17
16
1
15
14
13
12
11
10
9
8
7
6
5
4
3
2
Repeat for each channel
Apply
0.000mV
Short each input,
or apply 0.000mV
across each input
channel.
Shorting link.
10530-I
3. After the connections stabilize (about 10 seconds), request the offset
calibration by setting bit 00 in block transfer write word 28 and sending a
block transfer write (BTW) to the module. Refer to Table 7.A.
When the BTW is sent, all channels are calibrated to 0.000mV.
Performing Auto-calibration