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The 1756-OA8D is a ControlLogix AC digital output module providing 8 diagnostic-point outputs. It operates with a nominal input voltage of 120V/240V AC and is compatible with 20-pin Removable Terminal Block (RTB) housings, specifically the 1756-TBNH and 1756-TBSH.
Per-Point Diagnostics
Electronic Fusing
Broad Voltage Range
This module features per-point diagnostics and electronic fusing that is software-configurable to protect the system. It provides comprehensive fault detection, including "no load," "output short," and "blown fuse" status, ensuring increased system availability and simplified troubleshooting in 74…265V AC applications.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen-Bradley 1756-OA8D DIGITAL OUTPUT MODULE Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Power Generation
Provides diagnostic feedback for AC solenoids and motor starters. Electronic fusing protects against shorts to maintain continuous power plant operation.
Water Treatment
Manages AC actuators and pumps with per-point monitoring. Detects "blown fuse" or "no load" status without manual field inspection.
Oil and Gas
Controls processing equipment within 74…265V AC range. Enables remote troubleshooting of output points in hazardous industrial environments.
Automotive Manufacturing
Drives AC signaling devices and motor control centers on assembly lines. Software-configurable fusing ensures rapid response to minimize production downtime.
Metals and Mining
Reliable AC switching for conveyor systems and material handling. Provides real-time data on the integrity of heavy-duty load connections.
Chemical Processing
Monitors AC heaters and agitators in batch processing. Per-point diagnostics identify specific circuit failures to ensure process safety and quality.
The 1756-OA8D module must be installed in a ControlLogix chassis using a compatible 20-pin Removable Terminal Block (RTB), such as the 1756-TBNH or 1756-TBSH, ensuring all wiring adheres to the specified conductor wire size and torque requirements to prevent terminal overheating.
During operation, the module's electronic fusing must be correctly configured via software for each point to provide overcurrent protection, though it is intended to protect the module and should not replace external load-side fuses where required by local electrical codes. It is essential to maintain the field power within the 74…265V AC range and monitor the off-state leakage current, which is rated at a maximum of 4 mA per point, to avoid unintended activation of high-impedance loads.
When troubleshooting, users should reference the module's diagnostic registration which reports "no load" and "output short" conditions directly to the controller tags, allowing for proactive maintenance without necessitating manual circuit testing. Proper thermal management must be observed, as the module dissipates up to 14.66 BTU/hr, and users must ensure that the total chassis power consumption remains within the power supply's backplane current ratings of 250 mA at 5.1V DC and 125 mA at 24V DC.
What is the operating voltage range for the 1756-OA8D diagnostic AC output module?
The module has an operating voltage range of 74…265V AC, with a nominal input voltage of 120V AC or 240V AC at 50/60 Hz.
What is the maximum output current rating per point and per module for the 1756-OA8D?
The maximum output current is 2 A per point at 30 °C (86 °F), with a maximum total surge current of 4 A per module for 10 ms, repeatable every 2 s.
Does the 1756-OA8D module support individual point-level diagnostics and electronic fusing?
Yes, the module features electronic fusing that is software-configurable per point, and it provides diagnostic features such as "no load" and "output short" detection.
What is the maximum power dissipation and thermal dissipation for the 1756-OA8D module?
The maximum power dissipation is 4.3 W at 60 °C (140 °F), and the maximum thermal dissipation is 14.66 BTU/hr.
What are the off-state leakage current and on-state voltage drop specifications for the 1756-OA8D?
The maximum off-state leakage current per point is 4 mA, and the maximum on-state voltage drop is 2V AC at 2 A.
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