The 1756-OB16I ControlLogix Isolated DC Output Module from Rockwell Automation is a high-reliability 16-point individually isolated 24V DC output module designed for advanced industrial automation systems requiring strong electrical separation between channels.
Unlike standard DC output modules, the 1756-OB16I provides individual point isolation, improving fault containment, reducing cross-channel interference, and enhancing system stability in complex industrial environments. It is widely used in process automation, high-availability manufacturing systems, automotive production lines, and machine control applications where signal integrity and electrical isolation are critical.
This module is especially valued in architectures that require flexible wiring, reduced ground-loop risk, and high diagnostic clarity at the field level.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-OB16I |
| Series | ControlLogix Digital Output Modules |
| Module Type | 16-Point Isolated DC Output Module |
| Number of Outputs | 16 individually isolated outputs |
| Output Voltage Range | 10–30V DC |
| Nominal Voltage | 24V DC |
| Output Type | Sourcing / Sink-capable transistor outputs |
| Isolation | 250V continuous, point-to-point isolation architecture |
| Output Configuration | Individually isolated channels |
| Continuous Current per Point | 1.0 A @ 30°C (derates with temperature) |
| Continuous Current per Module | 8 A total (derated at higher temperature) |
| Switching Time | ON ≤ 1 ms, OFF ≤ 2 ms |
| Backplane Current (5.1V DC) | ~350 mA |
| Power Dissipation | ~3.6 W @ 60°C |
| Field Power Requirement | External 24V DC supply required |
| Terminal Block | 1756-TBCH / 1756-TBS6H |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Weight | ~0.30–0.40 kg |
Physical Dimensions
- Size (H × W × D): 145 × 55 × 140 mm
The slightly wider form factor (compared to standard OB modules) reflects its isolated channel architecture, while still maintaining compatibility with standard ControlLogix chassis design.
Recommended Related Models
The 1756-OB16I is commonly paired with:
- 1756-IB16 standard DC input module
- 1756-OB16 standard DC output module
- 1756-OB16E electronically fused output module
- 1756-OA16 AC output module
- 1756-L71 / L73 ControlLogix processors
- 1756-EN2T EtherNet/IP communication modules
Popular Allen-Bradley ControlLogix Output Modules
Within the ControlLogix output family, widely used models include:
- 1756-OB16I isolated DC output module
- 1756-OB16 standard DC output module
- 1756-OB16E electronically fused DC output module
- 1756-OB16D diagnostic DC output module
- 1756-OA16 AC output module
These modules provide scalable discrete control solutions across different industrial safety, isolation, and performance requirements.
