Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 76)

6–8 Module Calibration
Publication 1771ĆUM127B-EN-P - December 2002
8. Enter the first set of calculated low and high values into the first
channel output cal values of the block transfer write calibration
data file. If you are calibrating more than one output channel
simultaneously, enter the output cal values from the lowest
numbered output channel in the first output cal value slots. The
next lowest channel in the output mask goes in the second slot of
output cal values, and so on.
9. Send a block transfer write to the module with word 1 containing
CAL CLK bit (01) = 1, and HI/LO bit (00) = 1.
10.Send a block transfer write to the module with word 1 containing
CAL CLK bit (01) = 0, and HI/LO bit (00) = 1.
11. Request a block transfer read (BTR) from the module.
If the OUTPUT BAD CAL bit (word 5, bit 00, for channel 1 for
example) is reset, and the OUTPUT CAL DONE bit (word 3, bit
00 for channel 1 for example) is set, the procedure is complete.
If the bad BTW bit is set any time during the calibration
procedure, an error in the calibration procedure. Repeat the
calibration.
If the EEPROM bit 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.
In this chapter, you learned how to calibrate your module’s channels.
Chapter Summary