Allen-Bradley 1794-IE8H, User Manual, Page: 17 / 146

1 Publication 1794-UM063A-EN-P - March 2006
Chapter
1
About the FLEX I/O HART Analog Modules
What This Chapter Contains
Read this chapter to familiarize yourself with the input and output analog
modules.
What the FLEX I/O Analog
I/O Modules Do
The 1794 HART input and output modules must be used in a ControlNet or
EtherNet network.
The 1794-IE8H module accepts up to 8 analog inputs. The inputs are
nonisolated and will accept current in either of the following two ranges: 4 to
20 mA or 0 to 20 mA. The default input range is 0 to 20 mA. The inputs have
both fixed hardware filters and selectable firmware digital filters.
Similarly, the 1794-OE8H module provides as many as 8 analog outputs. The
outputs are nonisolated and will provide current in either of the following two
ranges: 4 to 20 mA or 0 to 20 mA. The default output range is 0 to 20 mA.
Each module offers:
•
local microprocessor intelligence for advanced features.
•
full functionality without switches or jumpers.
•
multiple data ranges that can be independently programmed
in channel groups.
•
lead breakage detection.
•
overrange/underrange alarms.
•
remote transmitter alarm.
For Information About See Page
What the FLEX I/O Analog I/O
Modules Do 1-1
How FLEX I/O Analog Modules
Communicate with Programmable
Controllers 1-2
Physical Features of Your Analog I/O
Module 1-3
Chapter Summary 1-8