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Includes a PDF Electric and Supply warranty.



4 In Stock

2 Yr PDF Supply Warranty

What is Refurbished?

Repair Service


5-10 Days

2 Yr PDF Supply warranty


Other Available Revisions for the 1756-OF8H 1756-OF8H/A

Common misspellings:
  • l756-OF8H
  • 1756-0F8H
  • 1756-OFbH
  • 1756OF8H

Technical Specifications for 1756-OF8H

ManufacturerAllen-Bradley / Rockwell Automation
Part Number1756-OF8H
Product TypeOutput Module
Outputs8 voltage or current outputs, one HART modem per module
Output Range+/-10 Volts, 0 to 20 milliamps and 4 to 20 milliamps
Resolution15 to 16 bits for all ranges
Total Backplane Power6.54 Watts
Power Dissipation4.92 Watts
Maximum Overvoltage Protection24 Volts DC

The Allen-Bradley 1756-OF8H analog output module comes with 8 differential outputs plus a HART modem. This module, which belongs to the ControlLogix series, has a selectable voltage or current rating that ranges from -10.4336 to 10.4336 Volts and 0 to 21.2916 milliamps. Its overall output is rated at ±10 Volts or 0 to 20 milliamps while its signal resolution is 15 to 16 bits. The module also has an overall backplane power of 6.54 Watts and a voltage range of 10 to 10.4 Volts or 0 to 20 milliamps and 4 to 20 milliamps. Its thermal dissipation is rated at 16.78 BTU per hour while its power dissipation is 4.92 Watts. Unlike other analog input or output (I/O) modules, the 1756-OF8H comes with an open circuit detection feature and it has a specified circuit detection time of 0.1 milliamps or less.

The device also features an isolation voltage of 50 Volts with basic insulation meticulously tested at 1500 Volts AC for 60 seconds between the backplane and output channels. Besides, the 1756-OF8H offers over-voltage protection and it has a maximum settling time of 23 milliseconds without the HART, and a maximum of 37 milliseconds with the HART. Its voltage settling time starts at 8.5 milliseconds. This module’s calibration accuracy is 0.1% (voltage) and 0.15% (current), while its standard calibration interval is approximately 12 months. With an offset drift of 200nA per degree Celsius and a total module error of 0.15% (voltage) and 0.3% (current), the 1756-OF8H analog output is appropriate for various industrial applications. It utilizes mechanical keying, but the module’s keying can also be configured electronically. Its operating temperature is 0 to 60 degrees Celsius at 5 to 95% non-condensing relative humidity. The module, which is enclosed in an open-type chassis also comes with the IEC, T4 North America, as well as the ATEX temperature codes.

The catalog number 1756-OF8H is reserved for an Allen-Bradley/Rockwell Automation output module that is available through the ControlLogix series. The module operates in an analog mode and it can be used for both voltage and current output applications. The 1756-OF8H module has 8 outputs and it features 1 HART modem per module. The module has an output current range of 0 to 20 milliamps and 4 to 20 milliamps at +/-10 Volts and a resolution of 15 to 16 bits for all ranges. In addition to that, the 1756-OF8H module has a backplane current rating of 230 milliamps at both 5.1 Volts DC and 24 Volts DC.

The 1756-OF8H module has total backplane power of 6.54 Watts and power dissipation rating of 4.92 Watts. The unit has a thermal dissipation rating of 16.78 BTU per hour and 50 Volts (continuous) isolation voltage for basic insulation. The module detects open circuits in the current mode, and it includes an overvoltage protection rating of +/- 24 Volts DC maximum. The 1756-OF8H output module has a scan time of 12 milliseconds minimum in analog mode and typical scan time of only 1 second in HART mode when a single channel is enabled. If all 8 channels are enabled for HART operation, the scan time should not be more than 10 seconds. The module includes electronic module keying, and it requires one slot in the chassis for installation. The 1756-OF8H module uses Category 2 copper wire on the signal ports. Additionally, the module has an open-style enclosure and a T4 temperature code rating.
The 1756-OF8H module is an Allen-Bradley/Rockwell Automation output analog module component intended for industrial use. The module provides 8 outputs for voltage and current power and it includes a HART modem.

F.A.Q for 1756-OF8H

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