1756-OB16IEF Allen Bradley | 16 Point Fast Isolated DC PWM

Allen Bradley 1756-OB16IEF ControlLogix 16-Pt Fast Isolated DC Output Module

Product Overview

The 1756-OB16IEF (1756-OB16IEF) is an ultra-high-speed, 16-point digital DC output module belonging to the Allen-Bradley ControlLogix series. Engineered for precision and deterministic control, this "Fast" module is equipped with Pulse Width Modulation (PWM) and peer-to-peer communication capabilities. These features allow it to interact directly with high-speed input modules (such as the 1756-IB16IF) to achieve sub-millisecond response times, bypassing standard backplane processing delays.

Every output on the 1756-OB16IEF is individually isolated and protected by electronic fusing. The integrated PWM functionality makes it ideal for controlling proportional valves, actuators, and heater circuits where precise duty-cycle control is required. Its rugged design and advanced diagnostics ensure it meets the demands of high-performance motion and process synchronization.

Detailed Technical Specifications

The 1756-OB16IEF provides the following technical parameters for high-speed automation:

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model Number: 1756-OB16IEF

• Module Type: Fast Digital DC Output with PWM & Peer-to-Peer

• Number of Outputs: 16 Individually Isolated points

• Voltage Category: 12/24V DC Sinking/Sourcing

• Operating Voltage Range: 10–30V DC

• Output Current (Point): 1.0 A @ 60 °C (140 °F); 2.0 A @ 30 °C (86 °F)

• Output Current (Module): 8.0 A @ 30 °C (86 °F); 4.0 A @ 60 °C (140 °F)

• Response Time: <25 μs (Nominal system transition)

• PWM Cycle Time: 1 ms (min) to 1 hour (max)

• PWM On-Time: 200 μs (min) to 1 hour (max)

• Isolation Voltage: 250V Continuous (Basic insulation type)

• Protection: Electronic Fusing per point (Auto-resettable)

• Backplane Current: 350 mA @ 5.1V DC; 3 mA @ 24V DC

• Power Dissipation: 3.6 W @ 60 °C

• Removable Terminal Block (RTB): 1756-TBCH or 1756-TBS6H (36-pin)