Rockwell Automation 1794-IF4I, -OF4I, IF2XOF2I, -IF4IXT, -IF4ICFXT, -OF4IXT, IF2XOF2IXT FLEX I/O Isolated Analog Modules - Manual (Page 54)

Publication 1794-6.5.8 - January 2010
54 Writing Configuration to and Reading Status from Your Module with a Remote I/O Adapter
Range Selection Individual input channels are configurable to operate with the
following voltage or current ranges:
You can select individual channel ranges using the designated words
of the write block transfer instruction. Refer to the Bit/Word
description for your particular module for word and bit numbers.
Safe State Selection You can select the analog values that your output module will
maintain in the event of a network communication error. When the
enable bit is cleared by a communication error, the analog outputs
will automatically switch to the values set in the safe state analog
words as defined by the safe state source bits. This allows you to
select a reset to 0V/0mA, or hold the outputs at their last state when
using the remote I/O adapter on remote I/O. Additionally, safe state
values can be setup using ControlNet, DeviceNet or other network
adapter.
Data Format The input/output data exchanged between the module and the
adapter is available in two’s complement, two’s complement percent,
binary and offset binary (refer to the range selection table above).
Table 4.1
Range Selection
Input channel Configuration
Input Values Data Format % Underrange/
% Overrange
Channel not configured
4–20mA signed 2’s complement 4% Under; 4% Over
±10V signed 2’s complement 2% Under, 2% Over
±5V signed 2’s complement 4% Under, 4% Over
0–20mA signed 2’s complement % 0% Under, 4% Over
4-20mA signed 2’s complement % 4% Under, 4% Over
0–10V signed 2’s complement % 0% Under, 2% Over
±10V signed 2’s complement % 2% Under, 2% Over
0–20mA binary 0% Under, 4% Over
0–10V binary 0% Under, 2% Over
0–5V binary 0% Under, 4% Over
±20mA offset binary, 8000H = 0mA 4% Under, 4% Over
4–20mA offset binary, 8000H = 4mA 4% Under, 4% Over
±10V offset binary, 8000H = 0V 2% Under, 2% Over
±5V offset binary, 8000H = 0V 4% Under, 4% Over