1756-ON8 Allen Bradley ControlLogix Output Module | 8-Point AC Card

Engineering Blueprint & Core Architecture

Global PLC Spare HUB Review

Industrial automation frameworks demand high-density digital actuation across heavy industrial processing lines. Automation specialists deploy the 1756-ON8 Allen Bradley ControlLogix output module to manage multi-point AC switching efficiently. Global PLC Spare HUB's Insight notes that producer-consumer network models eliminate traditional polling bottlenecks, ensuring deterministic event generation across backplane sub-assemblies.

Granular Technical Specifications

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• Manufacturer Brand: Allen Bradley
• Product Line Series: ControlLogix
• Module Part Number: 1756-ON8
• Hardware Module Type: Digital AC Output Module
• Output Point Capacity: 8 Points (4 points per isolated group)
• Nominal Voltage Rating: 24 Volts AC (Operating Frequency: 50-60 Hz)
• Operating Voltage Band: 10 to 30 Volts AC (Current > 50 mA at 47-63 Hz)
• Maximum Output Current (Per Point): 2 Amps at 60 degrees Celsius
• Maximum Output Current (Per Module): 5 Amps at 30 degrees Celsius, 4 Amps at 60 degrees Celsius
• Power Dissipation Limit: 5.1 Watts max at 60 degrees Celsius (Thermal Dissipation: 17.39 BTU/hr)
• Backplane Power Demand: 200 mA at 5 Volts DC (Total Backplane Power: 1.07 W)
• Compatible Terminal Blocks: 1756-TBNH, 1756-TBSH
• Isolation Voltage Threshold: 50 Volts Continuous (Basic Insulation Type)
• Physical Enclosure Style: Open-type configuration (Requires NEMA-rated cabinet protection)
• Physical Weight: 0.50 lbs (0.23 kg)

Hardware Compatibility & Target Application Scenarios

Global PLC Spare HUB Review

• Compatible Racks & Chassis: Designed for deployment across standard Allen Bradley 1756 ControlLogix backplane slots.
• Application Scenario 1: Interfacing low-voltage AC solenoid valves and pilot relays in continuous chemical dosing skids.
• Application Scenario 2: Controlling industrial motor starter coils within automated material handling conveyor clusters.
• Application Scenario 3: Managing high-speed AC indicator arrays and acoustic alarm sirens on manufacturing assembly floors.

Diagnostic Capabilities & Maintenance Protocols

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• Status LED Monitoring: Observe front-panel channel indicators to instantly verify individual output state energization and fault conditions.
• Backplane Health Checks: Monitor controller diagnostic tags for module-level thermal warnings if ambient chassis temperatures approach the 60 °C ceiling.
• Terminal Integrity Audits: Routinely inspect removable terminal block screws to prevent high-resistance contact drops during high-vibration production cycles.

Logistics, Global Fulfillment, and Warranty Terms

Global PLC Spare HUB Review

• Express Fulfillment Window: Dispatched within 24 to 48 hours via leading international logistics partners including FedEx, UPS, and DHL.
• Operational Warranty: Fully protected by a comprehensive 12-month replacement warranty covering component defects.
• Package Contents: One factory-fresh 1756-ON8 module packaged with standard safety documentation.

Expert Frequently Asked Questions

Global PLC Spare HUB Review

What specific terminal blocks are required for wiring the 1756-ON8 module?

This hardware requires either the 1756-TBNH or 1756-TBSH removable terminal block (RTB) for secure field connections.

How does the 10-30V AC operating range affect output current limits?

At higher operational temperatures up to 60 degrees Celsius, individual points are rated for 2 Amps while total module current is capped at 4 Amps.

What causes unexpected output dropping on a ControlLogix AC card?

Inadequate terminal screw torque or severe backplane voltage sags typically induce intermittent output dropouts.

Can this module be hot-swapped while the rack is powered?

No, standard safety protocols dictate that system power must be completely isolated before inserting or removing the module.

Why does the 1756-ON8 require an external enclosure?

The unit features an open-type enclosure design and must be housed inside an appropriate NEMA-rated cabinet to prevent environmental contamination.

Engineering Selection Guide

Global PLC Spare HUB's Insight

Verify your chassis slot power budget accounts for the 200 mA backplane current draw before integrating the 1756-ON8 module. Ensure environmental controls maintain internal cabinet temperatures below 60 degrees Celsius to maximize component lifespan and prevent thermal derating.

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