Overview
The Allen-Bradley 1746-OB8 is a general-purpose, 8-point digital DC output module engineered for the SLC 500 controller family. This sourcing DC output module provides reliable discrete output control in industrial automation and process control applications. With 10-50V DC source compatibility and robust electrical specifications, the 1746-OB8 delivers consistent performance in machine control, conveyor systems, motor starters, and facility automation.
Key Features
- 8 digital output points with current sourcing configuration
- Voltage range: 10-50V DC (source)
- Continuous current per point: 1.0A @ 30°C / 0.5A @ 60°C
- Maximum total module current: 8.0A @ 30°C / 4.0A @ 60°C
- Signal delay: 1 millisecond on, 1 millisecond off
- Electro-optical isolation of 1500V between I/O and control logic
- UL-listed, CE compliant, CSA and C-Tick certified
Technical Specifications
- Off-state leakage: Maximum 1 mA
- On-state voltage drop: 1.2V maximum @ 1.0A
- Surge current per point: 3.0A for 10 milliseconds
- Minimum load current: 1 mA
- Backplane current consumption: 135 mA @ 5V DC / 0 mA @ 24V DC
- Heat dissipation: 6.9W total / 0.775W per point
- Operating temperature: 0°C to 60°C (32°F to 140°F)
- Storage temperature: -40°C to 85°C (-40°F to 185°F)
- Operating humidity: 5% to 95% (non-condensing)
- Dimensions: Standard 1746 form factor for SLC 500 chassis mounting
- Weight: 0.86 lb
- Certifications: UL-listed, CE, CSA, C-Tick
Typical Applications
- Motor starter and contactor control
- Solenoid and valve activation
- Indicator lamp control
- Conveyor system control
- Assembly line machine control
- Process valve actuation
- Pump and compressor startup/shutdown
- Emergency stop circuits
Compatibility & Replacements
Compatible With
- SLC 500 controller family (SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04)
- SLC 500 I/O chassis (up to 30 I/O modules per chassis)
- Allen-Bradley discrete I/O wiring standards
- RSLogix 500 programming software
- Standard 10-50V DC power supplies
Replaces / Drop-In Replacement For
- Earlier versions of 1746-OB8 (all series)
- Direct replacement in SLC 500 systems requiring 8-point DC output
Works With
- RSLogix 500 discrete I/O configuration
- SLC 500 ladder logic programming
- Standard terminal wiring practices (numbered output terminals)
- Common 10-50V DC industrial power sources
