Setting channel gain calibration – Rockwell Automation 1771-IXE/D Thermocouple/Millivolt Input Module User Manual User Manual
Page 47
6–7
Module Calibration
Publication 1771Ć6.5.130 Ć May 1999
For example, if the observed value was 17, enter –53 [(0 – 17) x
3.0933 = –53] in signed magnitude binary into the upper byte of
the calibration word for that channel. Enter 10110101 in bits
17–10 of word 20. The lower byte will remain zero at this time.
6. Repeat steps 3 through 5 for each of the remaining input
channels.
7. Initiate a write block transfer to send the corrections to the
module. The input value read by the processor should now be
0000 for all channels.
Setting Channel Gain Calibration
1. Now set the precision voltage source for +100.000 millivolts.
Allow sufficient time (at least 10 seconds) for the input filter and
voltage source to settle.
Figure 6.5
Applying 100.000mV for Gain 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
100.000mV
Apply
+
-
10533-I