Product Overview
The Allen-Bradley 1756-ON8 is a ControlLogix digital output module engineered for demanding industrial environments. This 8-point output module provides precise On/Off control for devices such as motor starters, valves, and indicator lamps. With a compact design and robust construction, the 1756-ON8 integrates seamlessly into existing ControlLogix systems, delivering reliable performance and easy monitoring.
Key Features
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8-Point Output: Four points per group, ideal for distributed control.
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Wide Operating Range: 10-30 Volts AC, 50-60 Hz, suitable for global applications.
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High Current Capacity: 2 Amps per point at 60°C; module rating up to 5 Amps at 30°C.
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Hot Swap Support: Install or remove without powering down the system.
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Status Indicators: Integral LEDs for quick I/O status and health monitoring.
Technical Specifications
| Parameter |
Value |
| Series |
ControlLogix |
| Module Type |
Output Module |
| Outputs |
8-Point |
| Voltage |
240 Volts AC |
| Operating Voltage Range |
10-30 Volts AC |
| Max Output Current per Point |
2 Amps at 60°C |
| Max Output Current per Module |
5 Amps at 30°C, 4 Amps at 60°C |
| Power Dissipation (Max) |
5.1 Watts at 60°C |
| Backplane Current at 5V |
200 milliamps |
| Removable Terminal Blocks |
1756-TBNH, 1756-TBSH |
| Isolation Voltage |
50 Volts Continuous |
| Enclosure |
None (Open-type) |
| UPC |
10612598171450 |
Applications
The 1756-ON8 excels in applications requiring reliable On/Off control. Typical use cases include:
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Motor Starters: Direct control of AC motor contactors in conveyor systems.
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Valve Actuation: Operate solenoid valves in process control lines.
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Lighting Control: Manage industrial lighting circuits with high inrush currents.
Its wide voltage range and high current capability make it a versatile choice for both new installations and retrofits.
Installation & Setup
Install the 1756-ON8 into any ControlLogix chassis slot. No need to power down the system—hot swapping is supported. Secure the removable terminal block (1756-TBNH or 1756-TBSH) using the provided screws or shear hooks. Ensure the mating connector is tightened to prevent accidental disconnection. Always verify that power to the output devices is off before making or breaking connections.
Maintenance & Reliability
Regularly inspect the module for dust accumulation and ensure proper airflow around the chassis. The operating temperature range is 0-60°C, and the module can withstand 30g shock during operation. With no moving parts, the 1756-ON8 offers long service life. Monitor the status LEDs to catch potential issues early. For maximum uptime, keep a spare module in inventory.
Compatibility & Integration
The 1756-ON8 is part of the ControlLogix family, working with ControlLogix controllers, adapters, and remote terminal blocks. It supports both direct and rack-optimized connections, allowing flexible I/O mapping. The producer/consumer network model enables efficient data exchange without overloading the backplane.
Selection Guide
Before purchasing, verify your system's voltage requirements and output current needs. The 1756-ON8 handles up to 2A per point at 60°C, making it suitable for most AC loads. Ensure your chassis has an available slot and that your controller supports the module. For expert advice and competitive pricing, consider PLC Source PRO as your trusted supplier.