The Allen-Bradley 1756-OB16IS provides 16 highly reliable digital output channels for ControlLogix automation systems. This module features complete isolation between every individual point. Consequently, it prevents electrical noise or faults from spreading between connected field devices. The unit supports both sinking and sourcing configurations for maximum wiring flexibility. Furthermore, eight of these channels support scheduled output operations for time-critical tasks.
This module excels in applications requiring precise signal timing and hardware protection. It handles diverse DC loads across a wide 0 to 30V DC operating range. Additionally, the fast hardware response ensures rapid switching for high-speed industrial processes.
Core Technical Characteristics
- Manufacturer: Allen-Bradley / Rockwell Automation
- Model Number: 1756-OB16IS
- Product Series: ControlLogix
- Output Type: 16-Point Isolated Sinking/Sourcing
- Voltage Category: 24V DC (0–30V DC Range)
- Backplane Current (5V): 350 mA
- Backplane Current (24V): 2.5 mA
- Power Consumption: 1.8 Watts
- Thermal Dissipation: 12.28 BTU/hr
- Isolation Voltage: 250V Continuous (Point-to-Point)
- Dimensions: 3.5 x 14.2 x 14.5 cm
- Weight: 0.2 kg
Advanced Synchronization and Safety
The 1756-OB16IS utilizes Coordinated System Time (CST) for its eight scheduled outputs. This feature allows for synchronized control within 16.7 microseconds across the entire backplane. Moreover, users can define specific fault-state behaviors for each channel. The module defaults to an “Off” state during communication loss to maintain safety. However, “Hold Last State” and “On” options remain available for specific process needs.
The hardware also withstands significant mechanical stress in tough environments. It provides 30G shock resistance and 2G vibration protection. Furthermore, the unit operates efficiently in ambient temperatures up to 60°C. These robust specs ensure a long service life in heavy manufacturing sites.
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