1756-0B8EI

Overview of Allen Bradley 1756-OB8EI

The Allen Bradley 1756-OB8EI is an 8-channel, electronically fused, isolated output module designed for the ControlLogix platform. Built for high-reliability digital signal control, it operates as a 12/24V DC source output. Each output channel is individually isolated, ensuring robust signal separation and reducing the risk of cross-channel interference in critical applications. The 1756-OB8EI features electronic fusing for device protection, minimizing downtime and field failure. This output module integrates seamlessly with ControlLogix chassis, supporting efficient, modular expansion of industrial automation systems. It is engineered to deliver precise and safe control of output devices such as relays, contactors, pilot lamps, and more, making it valuable in environments demanding high reliability and consistent performance.

Key Features of Allen Bradley 1756-OB8EI

• Eight individually isolated 12/24V DC source output channels
• Electronically fused outputs for fault detection and protection
• Operating voltage range: 10–30V DC
• Per-point surge current capability up to 4A for 10 ms
• Maximum output current per channel: 2A
• Off-state leakage current max: 1 mA
• 250V continuous isolation voltage
• Compatible with ControlLogix I/O platform

Technical Specs of 1756-OB8EI

• Number of Outputs: 8, individually isolated
• Voltage Category: 12/24V DC Source
• Operating Voltage Range: 10–30V DC
• Current Draw @ 5.1V: 250 mA
• Current Draw @ 24V: 2 mA
• Total Backplane Power: 1.30 W
• Thermal Dissipation: 16.03 BTU/hr
• On-State Voltage Drop (max): 1.2V DC @ 2A
• Off-State Leakage Current (max): 1 mA per point
• Surge Current: 4A for 10 ms (repeatable every 2 seconds)
• Minimum Load Current: 3 mA
• Isolation Voltage: 250V (continuous)

Applications / Use Case

The Allen Bradley 1756-OB8EI output module is ideally suited for process and discrete manufacturing environments requiring reliable, isolated DC output control. Typical applications include the actuation of external relays, solenoids, pilot lights, and other low-voltage load devices within automated systems. Its electronic fusing offers enhanced circuit protection, making it suitable for safety-related tasks or mission-critical operations where downtime must be minimized. Widely used in automotive, packaging, food and beverage, and material handling industries, the 1756-OB8EI provides dependable performance where individual channel isolation and output circuit protection are operational priorities. Its compatibility with ControlLogix PLCs ensures seamless system integration and ease of deployment in both small and large automation projects.

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