Product Overview

The Allen-Bradley 1756-OB16E is a high-reliability discrete output module designed for the ControlLogix platform. This module features 16 sourcing output channels, specifically engineered to drive 24V DC industrial loads such as solenoid valves, actuators, motor starters, and pilot lights. A distinguishing feature of the "E" variant is its integrated electronic fusing, which provides advanced protection for the module's circuitry against overcurrent and short-circuit conditions, reducing the need for external fuse blocks and simplifying cabinet wiring.

As a core component of the 1756 I/O family, the 1756-OB16E supports "Removal and Insertion Under Power" (RIUP), allowing for maintenance without system shutdown. It is capable of being utilized in a local chassis alongside the controller or as distributed I/O across EtherNet/IP, ControlNet, or DeviceNet networks. The module's high-speed switching capability and robust isolation make it suitable for high-duty cycle applications in automotive, packaging, and material handling sectors.

Technical Characteristics

• Output Count: 16 discrete sourcing outputs (grouped in two sets of 8).

• Operating Voltage: 10 to 31.2V DC (24V DC Nominal).

• Output Current Rating: 1.0A maximum per channel at 60°C; 8.0A total per module.

• Inrush Capacity: Supports surge currents up to 2.0A per point for 10ms.

• Protection Mechanism: Per-group electronic fusing that can be reset via software (RSLogix 5000/Studio 5000).

• Switching Latency: Ultra-fast response with a nominal delay of 70 µs for both On and Off states.

• Current Draw: 250mA at 5.1V DC and 2mA at 24V DC from the backplane.

• Isolation Voltage: 250V continuous isolation between outputs and backplane.

• Thermal Dissipation: 4.1W maximum power dissipation at peak load.

• Connector Compatibility: Requires 1756-TBNH or 1756-TBSH Removable Terminal Blocks (RTB).

• Operational Environment: Standard industrial rating of 0°C to 60°C (32°F to 140°F).

• Dimentions:3.5x13x14.5cm

• Weight: 0.24 kg.

Operational Performance and Safety

The 1756-OB16E is optimized for deterministic performance in complex automation architectures. Its sourcing output configuration ensures that current flows from the module to the load, which is the standard safety preference for many industrial regions to prevent unintended machine starts during ground faults. The integrated electronic fuse not only protects the hardware but also provides diagnostic feedback to the controller, allowing the system to pinpoint exactly which group has experienced a fault.

The module’s front panel includes individual status LEDs for each of the 16 points, providing immediate visual verification of output states and fuse status. Designed to withstand 1350V AC dielectric testing, the 1756-OB16E ensures long-term durability even in electrically noisy environments. Whether integrated into a standard 1756-A7 chassis or a high-capacity 1756-A17 rack, this module delivers the precision and protection required for modern 24/7 manufacturing operations.