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Allen Bradley Flex I/O 1794 1794-OF8IH

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1794-OF8IH

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The Allen-Bradley 1794-OF8IH is a Flex I/O module. This module is an Isolated Output HART Analog Module that is part of the 1794 Flex I/O system. This module has Eight (8) 8 single-ended, isolated outputs, configurable for 0-20 mA and 4-20 mA with 16-bit resolution.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1794-OF8IH

ManufacturerAllen Bradley
Product typeOutput module
Product LineFlex I/O 1794
Part Number1794-OF8IH
UPC612598346912
Weight0.38 lbs (0.17 kg)
Product DescriptionFlex IO Isolated Analog Output HART Module
No. of OutputsEight (8) Isolated outputs
Output signals0-20 mA; 4-20 mA
Module Resolution16-Bit; Unipolar
Conversion method16-bits digital to analog converter
Conversion rate10 ms
Data formatEngineering Units; Percent of Full Scale; RAW/Proportional Count
Terminal Base1794-TB3, 1794-TB3S
CalibrationFactory Calibrated
Flexbus current80 mA @ 5V DC
Power dissipation, max5.0 W @ 24V DC
Thermal dissipation, max17.06 BTU/hr @ 24V DC
Outputs8
Pass-through message supportYes
Output current0 to 20 mA or 4 to 20 mA
Data conversion rate10 milliseconds
Operating temperature32 to 131 degrees Fahrenheit
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The Allen-Bradley 1794-OF8IH module is made by Allen-Bradley/Rockwell Automation as a FLEX I/O module. TheAllen-Bradley1794-OF8IH FLEX I/O module is an output module with HART capability. It comes with up to 8 analog outputs that are configurable for 0 to 20 mA and 4 to 20 mA. The 1794-OF8IH module can be used without jumpers and switches and it has multiple data ranges that the users can program independently on each channel. This output module can also detect lead breakages and it has alarms for overrange and underrange current situations. The Allen-Bradley 1794-OF8IH output module can be installed on a terminal base with. It locks to the terminal base when the keyswitch is rotated into position 4. This module supports pass-through messages with 1 or 2 pass-through connections supporting 8 queues per connection. Pass-through messages make it possible for the module to send HART messages to HART devices. Its data conversion rate is 10 milliseconds. The Allen-Bradley 1794-OF8IH module can operate in a temperature range of 32 to 131 degrees Fahrenheit.

This modules comes with Eight (8) analog output channels that are configurable for Current output such as 0-20 mA and 4-20 mA output signals. It has a resolution of 16 bits in unipolar format with actual resolution of 0.305 ?A/cnt. It uses an internal conversion rate of 10 ms with conversion rate of 16-bits digital to analog converter. The module channel’s settling time is 70 ms.

This module does not require an external power supply to be operated. It receives power from the FlexBus current with rated value of 80 mA @ 5V DC. This module has a maximum power dissipation of 5.0 W @ 24V DC and maximum Thermal dissipation 17.06 BTU/hr @ 24V DC.

This Flex I/O module is compatible for installation in 1794-TB3, 1794-TB3S terminal bases. It is factory calibrated and requires keyswitch position 4 when installing to the appropriate terminal base. Additionally, the wire type for use with this module depends on the type of the terminal base used by the 1794-OF8IH module.

This module has a dedicated register for HART data. This register is a 6 WORD register that contains the Fields Device, HART Communication, Loop Status, and primary value in IEEE 754-1985 Single-Precision 32-bit floating point.