Allen-Bradley 1756-OV16E 16-Point DC Output Module

1756-OV16E ControlLogix Electronically Fused Output Module Overview

The Allen-Bradley 1756-OV16E offers 16 sinking DC outputs with built-in electronic fusing. This module belongs to the ControlLogix family and provides reliable control for various DC loads. Each output point supports a continuous current of 1A at 60 °C, while the entire module handles up to 8A total. The electronic fusing protects each channel against overcurrent conditions, automatically shutting down the affected point and reporting the fault to the controller. This feature reduces downtime and simplifies troubleshooting in complex automation systems.

Technical Specifications and Performance

This output module operates with a supply voltage ranging from 10V to 30V DC, with a nominal rating of 24V DC. The 1756-OV16E delivers fast response times, with a nominal signal delay of 75μs for OFF-to-ON transitions and 360μs for ON-to-OFF transitions. The maximum delay for either transition is just 1ms, ensuring precise timing for high-speed applications.

The module draws 210 mA from the 5V backplane and 2 mA from the 24V backplane, resulting in a total backplane power of 1.12 W. Its maximum power dissipation reaches 6.72 W at 60 °C. Each output point has a maximum voltage loss of only 700 mV at 1A, maintaining efficient power delivery to connected loads.

Furthermore, the 1756-OV16E includes important protective features. Each point has a surge rating of 2A for 10ms, recurring every 2 seconds, handling brief inrush currents from inductive loads. The off-state leakage current stays below 1mA per point, preventing unintended activation of sensitive devices. The module also provides 250V insulation voltage with basic insulation type, routinely tested at 1350V AC for 2 seconds between outputs and the backplane.

Mechanical and Environmental Specifications

The 1756-OV16E operates reliably in temperatures from 0 to 60 °C (32 to 140 °F). It tolerates relative humidity between 5% and 95% without condensation. The module carries both IEC and North America T4 temperature codes, confirming its safety for use in hazardous locations. Its open enclosure design requires installation inside a proper industrial control cabinet.

Installation Guidelines

Installing the 1756-OV16E follows the standard ControlLogix procedure. Begin by powering down the chassis completely. Slide the module into an available slot until the locking mechanism secures it firmly. Next, attach a compatible removable terminal block, either the 1756-TBNH (screw type) or 1756-TBSH (spring clamp type). Connect your DC loads to the appropriate output terminals, observing correct polarity for sinking outputs. The common terminal connects to the positive side of the DC supply, while the load connects between the output terminal and the negative side. After wiring, restore power and configure the module through the controller's I/O tree. The electronic fusing activates automatically and reports faults via the status LEDs and controller tags.

Packaging List

Your shipment for the 1756-OV16E includes:

• One Allen-Bradley 1756-OV16E ControlLogix Output Module

• One removable terminal block (1756-TBNH or 1756-TBSH, subject to availability)

• One quick-start guide with wiring diagrams

• Anti-static protective packaging

Frequently Asked Questions (FAQ)

1. What does "electronically fused" mean on the 1756-OV16E?
Each output point on the 1756-OV16E has built-in electronic overcurrent protection. When a short circuit or overload occurs, the module shuts down that specific channel and sends a fault signal to the controller, preventing damage without blowing physical fuses.

2. Can I use the 1756-OV16E with AC loads?
No, this module is designed for DC sinking outputs only. It operates with 10-30V DC loads. For AC output applications, consider the 1756-OA16 or 1756-OB series modules instead.

3. What is the total current limit for all 16 outputs combined?
The 1756-OV16E has a maximum aggregate current of 8A at 60 °C across all 16 points. Even though each point supports 1A, you must ensure the total does not exceed 8A to maintain proper thermal performance.

4. Which terminal block works with the 1756-OV16E?
This module accepts either the 1756-TBNH (screw-clamp) or 1756-TBSH (spring-clamp) removable terminal blocks. Both provide secure connections for field wiring.

5. How do I reset a tripped electronic fuse on this module?
The electronic fuse resets automatically once the fault condition clears and the output command turns off and then on again. You can also cycle the output through your control program or perform a module reset via the controller.