Specifications

Publication 1794-SG002D-EN-P - May 2012
92 Select FLEX Ex I/O Modules
Module Specifications
The following section shows more detailed module specifications in comparative
groups to facilitate your selection based on your requirements.
1797-IE8, 1797-IE8H (HART), and 1797-IE8NF (with Noise Filter)
8 Point 16-bit Single-ended Non-isolated Analog Input Modules
Eight single-ended input channels referenced to a single common
• 3-wire input for 2- and 3-wire transmitters
•Functional data: normal input
input current = 4...20 mA, full-current range
0...22 mA to allow for over and underrange indication
• Wire-off detection, signal to the backplane and LED (per channel)
blinking red for fault
• Wire-off detection on per channel basis via module data bits
• Input filter cutoff programmable
• Resolution: 16 bits
• Accuracy: 0.1%
• The 1797-IE8 is typically used to act on change-of-state and high-speed
applications. It is not compatible with HART handheld devices.
• The 1797-IE8NF has additional hardware filtering that damps out
spurious signals and can be used for slower changing, steady-state
processes. It has slower step response than the 1797-IE8 (100 ms versus
4 ms). It is compatible with HART handheld devices.
• The 1797-IE8H is similar to the 1797-IE8NF with real time data table
updates. It also supports pass-through of HART commands as
unscheduled ControlNet messages. It is compatible with FDT software
packages.
Output Modules
1797-OE8 — 8 1797-TB3, 1797-TB3S 0…20 mA
4…20 mA
16-bit single-ended,
nonisolated outputs
1797-OE8H 16-bit single-ended,
nonisolated outputs with
HART capability
Analog I/O Module Summary
Catalog Number Inputs Outputs Terminal Base Unit Signal Range Module Type