Rockwell Automation 1771-IXHR , D17716.5.80 HIGH RESOL.THERMOCOUPLE - Manual (Page 40)

Module Calibration
Chapter 7
7Ć6
Figure 7.3
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.
10532-I
3. Observe the input value read by the processor (word 4 of the BTR file for
channel 1). It should be 0.
4. Multiply the difference between your observed value and 0.000 by 3.0933.
Determine the magnitude and sign of the required correction. (With zoom
= 1, divide the difference by 3.2328.)
You can adjust the correction up to +127 binary counts (+410.56
µ
V).
A negative correction means that the reading was too high and you want
to subtract a corrective amount from that reading.
A positive correction means that the reading was too low and you want to
add a corrective amount to that reading.
5. Enter the magnitude and sign of the correction in binary code into the
upper (offset correction) byte of the calibration word for that channel.
(BTW file, word 20, bits 15–08 for channel 1.)