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Chapter 1, About the flex i/o hart analog modules, What this chapter contains – Rockwell Automation 1794-OE8H FLEX I/O HART Analog Modules User Manual User Manual

Page 17: What the flex i/o analog i/o modules do, Chapter

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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

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