Rockwell Automation 1771-IXE/D Thermocouple/Millivolt Input Module User Manual User Manual
Page 43
6–3
Module Calibration
Publication 1771Ć6.5.130 Ć May 1999
Table 6.A
Write Block Transfer Word 28
Word
Bit
17 16 15 14 13 12 11 10 07 06 05 04 03
02
01
00
Inhibit Calibration
RequestedAuto-Calibration
Word28
8
7
6
5
4
3
2
1
Set these bits to 0
Requested
Save
Values
Requested
Gain Cal.
Requested
Offset Cal.
NOTE: Normally, all channels are calibrated simultaneously (bits
10–17 of word 28 are octal 0). To disable calibration on any
channel, set the corresponding bit 10 through 17 of word 28.
4. Queue block transfer reads (BTRs) to monitor for offset
calibration complete and any channels which may have not
calibrated successfully. Refer to Table 6.B.
Table 6.B
Read Block Transfer Word 13
Word
Bit
17 16 15 14 13 12 11 10
07
06
05 04 03
02
01
00
UncalibratedChannels
Auto-Calibration Status
Word13
8
7
6
5
4
3
2
1
Cal.
Fault
EEPROM
Fault
Not used
Save to
EEPROM
Complete
Gain Cal.
Complete
Offset Cal.
Complete
5. Proceed to Gain Calibration below.
Gain Calibration
Calibrating gain requires that you apply +100.000mV across each
input channel.
Normally all inputs are calibrated together. To calibrate the gain of
an input, proceed as follows:
1. Apply +100.000mV across each input channel as shown in
Figure 6.2.