Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 74)

6–6 Module Calibration
Publication 1771ĆUM127B-EN-P - December 2002
Table 6.E
Calibration Block Transfer Read
Word/Dec. Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Word/Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
0 Calibration BTR Header = C000H
1 Unused = 0 Range EEPROM
Bad
BTW
2 Input Cal Done bits
3 Output Cal Done bits
4 Input Bad Cal bits
5 Output Bad Cal bits
6 Corrected Channel 1 Data
7 Corrected Channel 2 Data
8 Corrected Channel 3 Data
9 Corrected Channel 4 Data
10 Corrected Channel 5 Data
11 Corrected Channel 6 Data
12 Corrected Channel 7 Data
13 Corrected Channel 8 Data
5. Apply the appropriate high reference signal (Table 6.D) to all
input channels being calibrated (for channel 1, I1 on RTP).
6. Send a block transfer write to the module with word 1 containing
CAL CLK bit (01) = 1, and HI/LO bit (00) = 1.
7. Send a block transfer write to the module with word 1 containing
CAL CLK bit (01) = 0, and HI/LO bit (00) = 1.
8. Request a block transfer read (BTR) from the module. If the
INPUT BAD CAL bit (block transfer read word 4, bit 00, for
channel 1 for example) is reset, and the INPUT CAL DONE bit
(BTR word 2, bit 00 for channel 1 for example) is set, the
procedure is complete.
If the bad BTW bit (word 1, bit 00) is set any time during the
calibration procedure, an error occurred during the calibration
procedure. Repeat the calibration.
If the EEPROM bit (word 1, bit 01) is set, the module has a
hardware fault. The module cannot be calibrated.
If the RANGE bit (word 1, bit 02) is set, the channel(s) did not
calibrate because one of the reference signals was out of range.
Repeat the procedure. If the RANGE bit is set a second time,
either the channel is bad, or there is a problem with the
calibration equipment.