Specifications

Publication 1794-SG002D-EN-P - May 2012
96 Select FLEX Ex I/O Modules
FLEX Ex I/O Analog
Output Modules
1797-OE8 and 1797-OE8H (HART) 8 Point 13-bit Single-ended
Non-isolated Analog 8 Output Module
• Eight dual-ended output channels referenced over sense resistors to a single
common
• Functional data:
–normal output
– current = 4...20 mA, full current
– range = 0...22 mA to allow for over- and under-range indication
• Output wire-off detection, LED (per channel) blinking red for fault,
threshold < 2 mA
• Output wire-off detection on per channel basis via module data bits
• Short circuit detection
• All channels updated to the backplane every 4 ms
• Resolution: 13 bits
• Accuracy: 0.1%
• One power supply loop for one module
• Output fault state programmable
• The 1797-OE8 and 1797-OE8H can be used in digital mode for low
energy digital field devices.
• The 1797-OE8H is similar to the 1797-OE8 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.
Schematic Drawing of the 1797-OE8 and 1797-OE8H Modules
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8 Point 13-bit Single-ended Non-isolated Analog 8 Output Modules
Specification 1797-OE8 1797-OE8H
Output resolution 13 bits
Output load range 0…500 Ω @ 22 mA
> 11V @ 22 mA
0…680 Ω @ 22 mA
> 15V @ 22 mA
Step response to 99% of
Full Scale
4 ms 18 ms;
115 ms with HART active