Order now the 1794-OB16, a high-density 16-point digital sourcing output module from the Allen-Bradley FLEX I/O family. This module is the industry standard for driving 24V DC discrete loads, offering a compact footprint and seamless integration with Logix-based controllers via standard communication adapters.
What Is the 1794-OB16?
The 1794-OB16 is a versatile 16-channel digital output module that provides sourcing (current-to-load) capabilities. It is designed to switch 24V DC power to actuators, pilot lights, and relay coils. As part of the FLEX I/O system, it offers a modular solution that reduces cabinet space requirements. The module interfaces with the field via a separate terminal base, which simplifies maintenance by allowing for «hot-swapping» without disconnecting field wires.
Key Technical Specifications
- Number of Outputs: 16 Sourcing
- Operating Voltage Range: 10V DC to 31.2V DC
- Output Current Rating: 8.0A per module (500mA maximum per channel)
- Surge Current: 2A for 50ms, repeatable every 2 seconds
- Off-State Leakage: 0.5mA maximum
- On-State Voltage Drop: 0.5V DC maximum
- FLEXBus Current: 80mA
Industrial Compatibility
The 1794-OB16 is compatible with all FLEX I/O terminal bases, including screw, spring, and fused versions. For optimal performance in high-noise environments, it should be used with a 1794-TB3 or 1794-TB3S base. It supports electronic keying in Studio 5000, ensuring that the control system recognizes the specific hardware revision and prevents operational errors during replacement.
Maintenance Tips
To prolong the life of the 1794-OB16, monitor the total module current. While each channel can handle 500mA, the total module current must not exceed 8A. If you are driving inductive loads like large solenoid valves, ensure you use external surge suppression (diodes) to prevent back-EMF from damaging the internal sourcing transistors over time.
Frequently Asked Questions
Q: Does the 1794-OB16 provide short-circuit protection?
A: No, the standard 1794-OB16 does not have built-in electronic short-circuit protection. For protected outputs, you should consider the 1794-OB16P or use a fused terminal base like the 1794-TBNF.
Q: Can I parallel multiple outputs to drive a higher current load?
A: No, it is not recommended to parallel outputs to increase current capacity as the load sharing between channels cannot be guaranteed, which may lead to module failure.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here: https://atlantechdrives.com/manufacturers/allen-bradley/
