Rockwell Automation 1771-OFE/B Analog Output Module User Manual - Manual (Page 61)

6-9
Publication 1771Ć6.5.30 - November 1998
15.Remove the extender card and return the circuit board to the
module.
16.Replace the LAST STATE configuration jumpers to their original
position.
17.Replace the module covers.
18.Return the module to the I/O rack.
19.Replace your analog device wires (or the original field wiring
arm if you used a spare for calibration procedures).
Your module should now be properly calibrated and ready for use.
Preparation for Calibration
1. Turn off power to the processor and I/O chassis.
2. Remove the analog output module from the I/O chassis.
3. Remove the module covers.
4. Connect the backplane extender card (cat. no. 1771-EX) to the
circuit board and insert the extender card into the I/O chassis.
5. Reconnect the wiring arm to the circuit board.
Channel Calibration
1. Disconnect your analog device wiring from the module’s wiring
arm.
Important: If you have a spare or unused field wiring arm, you may
want to temporarily switch it with the module’s present
wiring arm. Use the spare wiring arm for test and
calibration purposes to eliminate disconnecting your
device wiring.
Important: The accuracy of this calibration procedure depends on
the precision of the load resistors used. Use resistors
with a tolerance of 0.01%. You should be able to obtain
voltage readings to +5mV. (If you use resistors of a
value different from 250 ohms, you should be able to
obtain voltage readings of +0.05% of V out). If you
require greater accuracy, use load resistors with
tolerances less than 0.01%.
If greater accuracy is required, substitute resistors that more
closely approximate your actual device load.
Current Output Version
(1771ĆOFE3)