Allen Bradley 1769-OB16 Output Module

The Allen Bradley 1769-OB16 is a digital output module from the Compact I/O family, designed for use with CompactLogix and MicroLogix 1500 PLC systems. This module provides 16 sourcing (PNP) output points, each capable of supplying up to 0.5 A at 24 V DC, with a total module current of 4 A (8 A with derating). It is used to drive industrial loads such as solenoid valves, motor contactors, indicator lamps, and relay coils in automation and process control applications.

The module features a compact footprint, allowing up to 32 modules in a single system. It includes LED status indicators for each output, a module OK LED, and removable terminal blocks for easy wiring and maintenance. The 1769‑OB16 is fully supported in RSLogix 5000 and Studio 5000 environments, with auto‑configuration and diagnostics capabilities.

Technical Specifications

• Number of outputs: 16 (sourcing, solid‑state transistor)

• Output voltage: 24 V DC (20.4‑26.4 V DC)

• Output current per point: 0.5 A (continuous)

• Total module current: 4 A (max), 8 A with 50% derating at higher ambient

• Output protection: Short‑circuit and overcurrent protection (auto‑reset)

• Power dissipation: 3.5 W (typical)

• Logic supply: 5 V DC (from backplane), 120 mA

• Field power: 24 V DC (external), 200 mA (plus output load)

• Response time: < 0.1 ms (OFF‑ON), < 0.2 ms (ON‑OFF)

• LED indicators: One green per output, one green/red for module status

• Terminals: Removable screw‑type (0.5‑1.5 mm²)

• Dimensions: 118 x 87 x 35 mm (H x D x W)

• Operating temperature: 0°C to +60°C

• Certifications: CE, UL, cUL, RoHS

Functional Capabilities

• Protection features: Each output is short‑circuit protected and automatically resets when the fault is removed, minimizing downtime.

• Diagnostic feedback: The module can report output status and fault conditions to the PLC, enabling remote troubleshooting.

• High‑density wiring: 16 points in a small package, reducing panel space requirements.

• Removable terminal block: Allows pre‑wiring and quick module exchange without rewiring.

Typical Applications

• Conveyor control: Driving motor starters and diverters.

• Packaging machinery: Actuating pneumatic cylinders and solenoids for cutting, sealing, and labeling.

• Assembly stations: Controlling vibratory feeders, pick‑and‑place actuators, and torque tools.

• HVAC systems: Switching fans, dampers, and valve actuators.

Integration with CompactLogix

The 1769‑OB16 mounts directly on the CompactLogix DIN rail or panel, connecting to the CPU via the local bus. In Studio 5000, the module is added to the I/O configuration, and the output tags are automatically created. The user can map each output to a bit in the controller's tag database. Configuration includes setting the output state on communication loss (hold last value or go to programmed state). The module supports electronic keying to ensure correct replacement.

Installation and Wiring

Mount the module on the DIN rail, connecting it to adjacent modules via the interlocking bus. Connect the 24 V DC field power supply to the terminals marked “V” and “COM”. Each output terminal (O0 to O15) connects to the load (e.g., solenoid) with the return to the common supply. Use appropriate wire gauges and ferrules. The module’s status LED will illuminate when power is on and the output is enabled.

Compliance

The module complies with EN 61000‑6‑2, EN 61000‑6‑4, and UL 508. It carries CE and cULus marks, and is RoHS compliant.

Conclusion

The Allen Bradley 1769‑OB16 output module provides a dense, reliable, and protected solution for controlling DC loads in CompactLogix systems. Its diagnostics, easy wiring, and robust protection make it a staple for discrete control applications.