Publication 1794-6.5.8 - January 2010
12 Overview of FLEX I/O and your Analog Modules
Types of FLEX I/O Modules
We describe the following FLEX I/O Analog modules in this user man-
ual:
FLEX I/O analog input, output and combination modules are block
transfer modules that interface analog signals with any Allen-Bradley
programmable controllers that have block transfer capability. Block
transfer programming moves input from the module’s memory to a
designated area in the processor data table, and output data words
from a designated area in the processor data table to the module’s
memory. Block transfer programming also moves configuration words
from the processor data table to module memory.
The analog modules have selectable ranges as shown in the table
below:
Catalog Number Voltage Inputs Outputs Description
1794-IF4I 24V dc 4 – analog – 4 input, isolated
1794-OF4I 24V dc – 4 analog – 4 output, isolated
1794-IF2XOF2I 24V dc 2 2 analog – 2 input, isolated and 2 output, isolated
Input Values Data Format Underrange/Overrange
4–20mA signed 2’s complement 4% Underrange, 4% Overrange
±10V signed 2’s complement 2% Underrange, 2% Overrange
±5V signed 2’s complement 4% Underrange, 4% Overrange
0–20mA signed 2’s complement % 0% Underrange, 4% Overrange
4-20mA signed 2’s complement % 4% Underrange, 4% Overrange
0–10V signed 2’s complement % 0% Underrange, 2% Overrange
±10V signed 2’s complement % 2% Underrange, 2% Overrange
0–20mA binary 0% Underrange, 4% Overrange
4–20mA binary 4% Underrange, 4% Overrange
0–10V binary 0% Underrange, 2% Overrange
0–5V binary 0% Underrange, 4% Overrange
±20mA offset binary, 8000H = 0mA 4% Underrange, 4% Overrange
4–20mA offset binary, 8000H = 4mA 4% Underrange, 4% Overrange
±10V offset binary, 8000H = 0V 2% Underrange, 2% Overrange
±5V offset binary, 8000H = 0V 4% Underrange, 4% Overrange
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