Rockwell Automation 1769-OF4VI Compact I/O Isolated Analog Modules - Manual (Page 31)

Publication 1769-UM014B-EN-P - May 2010
Installation and Wiring 2-15
As output impedance (Rs) and/or resistance (dc) of the cable (Rc) get larger,
system accuracy decreases. If you determine that the inaccuracy error is
significant, implementing the following equation in the control program can
compensate for the added inaccuracy error due to the impedance of the output
module and cable.
Label the Terminals
A removable, write-on label is provided with the module. Remove the label
from the door, mark the identification of each terminal with permanent ink,
and slide the label back into the door. Your markings (ID tag) will be visible
when the module door is closed.
Figure 2.6 Terminal Labels
TIP
In a current loop system, source and cable impedance do
not impact system accuracy.
Vs Vin
Rs
2 Rc    Ri + +  
Ri
-------------------------------------------------------  =
Wire the
Finger-safe
Terminal Block
Upper Retaining Screw
Lower Retaining Screw