Overview
The Allen-Bradley 1746-OB32E is a SLC 500 digital discrete output module providing 32 independently controllable 24VDC sourcing output channels. This electronically protected module delivers reliable performance for controlling solenoids, pilot lights, motors, horns, and other discrete devices in industrial automation systems. The sealed Series A design ensures durability in demanding factory environments.
Key Features
- 32 isolated output channels with 16-point groups for flexible load distribution
- Electronic protection from overload and short-circuit conditions with auto-reset capability
- Sourcing output configuration—delivers current to external load circuits
- Status LED indicators for real-time channel diagnostics and troubleshooting
- Color-coded removable terminal blocks for quick field wiring and maintenance
- Hot-swappable design allows module replacement without system shutdown
Technical Specifications
- Output Channels: 32-point (two groups of 16)
- Output Type: Sourcing (current source)
- Output Voltage: 24V DC nominal
- Operating Voltage Range: 10–30V DC
- Continuous Current: 4A per common / 0.5A per channel
- Backplane Current Consumption: 190 mA @ 5V DC
- Protection: Electronically protected, auto-reset on overload
- Operating Temperature: 0–60°C (32–140°F)
- Non-Operating Temperature: −40–85°C (−40–185°F)
- Relative Humidity: 5–95% (non-condensing)
- Mounting: Chassis (SLC 500 fixed or modular rack)
- Enclosure Type: Open style with sealed terminal area
- Weight: 0.51 lbs
- Series: Series A (sealed module)
- Compatible Models: SLC 5/03, SLC 5/04, and other SLC 500 CPUs
Typical Applications
- Motor control: Start/stop commands for conveyor drives, pump motors, and production line equipment
- Solenoid actuation: Valve control, hydraulic/pneumatic load switching, and material handling
- Pilot devices: Indicator lights, buzzers, horns, and audible/visual alarms
- Emergency stop circuits: E-Stop signaling and fault-triggered shutdowns
- Power monitoring: Load energization and equipment state indication
Compatibility & Replacements
Compatible With
- SLC 500 fixed and modular hardware platforms
- SLC 5/03, SLC 5/04, and equivalent SLC 500 CPU modules
- ControlNet and DeviceNet communication networks
- RSLogix 500 programming software
- Allen-Bradley 1492-series wiring terminals and connector systems
Replaces / Drop-In Replacement For
- 1746-OB32 (earlier revision, without electronic protection)
- 1746-OB32/A Series variants
- Verify compatibility with your system integrator before ordering.
Works With
- Software: RSLogix 500, Studio 5000 (via compatibility adapter)
- Protocols: ControlNet, DeviceNet, native SLC 500 communication
- Accessories: 1492-CABLE0100 wiring harness, octal label kits, terminal extensions
- Host Systems: Adaptable to ControlLogix platforms using interface modules (1747-AIC)
