Allen Bradley 1756-OX81 Isolated digital relay output module

FAQ

Q1: What is the main function of the 1756‑OX81 module?
It provides eight isolated electromechanical relay outputs for switching AC or DC field devices in a ControlLogix system.

Q2: How many output channels does it have?
It has 8 relay output channels.

Q3: What types of loads can the relays switch?
The module can switch a wide range of loads up to typical industrial control voltages (e.g., AC and DC).

Q4: Are the outputs isolated?
Yes, outputs are isolated from the backplane and other channels to improve noise immunity and safety.

Q5: How much current can each relay contact handle?
Each output relay can typically handle around 2 A per point.

Q6: Does the module draw power from the chassis backplane?
Yes — like other ControlLogix I/O modules, it uses backplane power.

Q7: What are the environmental operating limits?
It operates between 0 °C and 60 °C and can be stored from –40 °C to 85 °C with up to 95 % non‑condensing humidity.

Q8: What are the typical size and weight of the module?
The module’s dimensions follow the standard 1756 I/O footprint (about 300 mm × 38.1 mm × 111.25 mm) and weighs roughly 0.35–0.45 kg.

Allen Bradley

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