The Allen-Bradley 1756-OB8EI is a ControlLogix electronically-fused, isolated output module. It has been fused on a per-point basis and has 8 individually-isolated outputs. Use a removable terminal block housing for this module, particularly the 1756-TBCH and the 1756-TBS6H. Before installing it to the chassis, make sure that the chassis and power supply have already been installed and grounded.
The 1756-OB8EI module has the following features: electronic fusing, configurable point-level output states, multiple output point densities, isolated and non-isolated varieties of output modules, and output data echo. The module allows configuration of the output state in program mode, output state in Fault Mode, and transition from Program State to Fault State via the RSLogix 5000 programming software.
This module has an operating voltage of 10-30V DC and a voltage category of 12-24V DC sink/source. It has a short trip of greater than 4.5 A for a maximum of 500 µs (output on, then short) and greater than 4.5 A for a maximum of 1.5 ms (output on into short), with a +/- 1 ms timestamp of diagnostics. It has a current draw of 250 mA at 5.1V and 2 mA at 24V. The module's total backplane power is 1.30 W with a maximum thermal dissipation of 16.03 BTU/hr. The module has a maximum off-state leakage current of 1 mA per point and a maximum voltage drop of 1.2V DC at 2 A. It also has a maximum current per point of 2A at 60 degrees Celsius and a maximum current per module of 10A at 60 Degrees Celsius and of 16A at 55 Degrees Celsius (linear derating). It has a surge current per-point of 4 A for 10 ms that is repeatable every 2s and with a 3 mA load current minimum. It also has a continuous isolation voltage of 250V and this module is routine-tested for 2s at 1350V.
The 1756-OB8EI allows you the option of holding the last state and turning on or turning off the states in Fault Mode or Program Mode. Note that the default setting for both is “Off.”
It also has an output delay time of a maximum of 1 m from off to on and a maximum of 5 ms from “On” to “Off.” Its operating temperature has a range of 0-60 degrees Celsius, while its non-operating temperature has a range of -40-85 degrees Celsius. It also has a maximum surrounding air temperature of 60 degrees Celsius and a non-condensing relative humidity level of 5-95%.
Repair Services for 1756-OB8EI
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Our highly skilled technicians can repair your ControlLogix 1756-OB8EI. All our repairs come with a 1 Year Warranty. Please contact us for additional information about our repair process.
Revisions for 1756-OB8EI
Please refer to the manual for more information about the 1756-OB8EI such as the wiring diagrams, data sheets,
firmware information and migration or obsolescence details.
|Revision Part #
||Also Known as
||1756-OB8EI/A, Series A, Rev A