Overview
The Allen-Bradley 1746-OB32 is a 32-point digital output module designed for the SLC500 family of programmable logic controllers. This Series D module provides high-density, transistor-source output capability for controlling discrete industrial devices. The 1746-OB32 delivers precise digital switching with sourcing output topology, making it ideal for driving solenoids, contactors, indicator lights, and other 24 VDC loads in manufacturing and process control systems.
Key Features
- 32 Digital Output Points: Thirty-Two (32) 24VDC output channels organized into two (2) input groups with each group having sixteen (16) points
- Transistor Source Output: Transistor source output module, meaning it provides a positive voltage signal to the connected load
- Wide Operating Voltage Range: Sourcing operational voltage ranging between 5 and 50V DC
- Low Backplane Current: Module draws 0.19A of backplane current at 5V DC
- Fast Switching: Maximum signal delay time of 0.1ms in ON and 1ms in OFF mode
- High Isolation: Output circuit isolation tested at 1500V AC for 1 minute
Technical Specifications
Key technical parameters for the Allen-Bradley 1746-OB32:
- Output Channels: 32 points (16 per common, 2 commons)
- Output Type: Transistor source (DC sourcing)
- Nominal Output Voltage: 24 VDC
- Operating Voltage Range: 5–50 VDC
- Per-Point Current Rating: 0.25A at 0-60 Deg. Celsius nominal current on each output point and the minimum current load of 1mA for every output channel
- Total Module Current: Average 8A nominal current and a 2A current per common
- Backplane Current (5V): 190 mA
- Output Isolation: 1500V AC for 1 minute
- Signal Delay (ON): 0.1 ms
- Signal Delay (OFF): 1 ms
- OFF-State Leakage: 1 mA maximum
- Operating Temperature: 0 to 60 deg. Celsius (32 to 140 deg. Fahrenheit)
- Humidity: 5-95% non-condensing humidity
- Mechanical Shock: 30G at 10-200Hz
- Vibration: 2.5G at 10-200Hz
- Certifications: C-UL and UL Listed Industrial Control Equipment for Class I, Division 2, Groups A, B, C, D Hazardous Locations
- Module Heat Dissipation: 6.45 W
Typical Applications
The 1746-OB32 is well-suited for discrete output control in:
- Motor starter solenoid actuation and valve control
- Indicator light and status signal control
- Conveyor and assembly line automation
- Packaging and material handling systems
- Pump and compressor on/off control
- Industrial equipment interlocks and safety circuits
Compatibility & Replacements
Compatible With
- SLC500 fixed-configuration chassis and racks
- SLC500 modular I/O systems
- 1746 Chassis (any available slot except slot 0)
- RSLogix 500 programming software
- 24 VDC sourcing output devices and loads
Replaces / Drop-In Replacement For
The 1746-OB32 Series D is compatible with earlier generations of the same module. Verify compatibility with your system integrator before ordering if replacing different output module types.
Works With
- RSLogix 500 (Ladder Logic, Structured Text)
- Studio 5000 (via legacy support and migration tools)
- EtherNet/IP communication (when paired with compatible bridge modules)
- SLC500 discrete I/O programming constructs and output addressing
