Product Overview
As industrial automation evolves, the demand for reliable, high-density discrete output modules continues to grow. The Allen-Bradley 1794-OB32P meets this need as a Flex I/O digital DC output module designed for demanding control applications. With 32 sourcing channels and individual electronic protection, this module provides robust performance for controlling 24V DC loads such as pilot lights, relays, and solenoid valves. It integrates seamlessly into Rockwell Automation systems, offering a compact solution for expanding I/O capacity.
Technical Specifications Breakdown
Key parameters for the 1794-OB32P are listed below for quick reference:
| Feature | Specification |
|---|---|
| Output Type | Discrete Outputs |
| Number of Channels | 32 |
| Output Circuit Type | Sourcing |
| On-state Voltage (nominal) | 24V DC |
| On-state Voltage (min) | 10V DC |
| On-state Voltage (max) | 31.2V DC |
| On-state Current (max per channel) | 500mA |
| Output Current Rating (per module) | 14.0 A max (6 A total for channels 0...15; 8 A total for channels 16...31) |
| On-state Voltage Drop (max) | 0.5V DC |
| Off-state Leakage Current (max) | 0.5mA |
| Isolation Voltage | 50V Continuous |
| Flexbus Current | 80mA @ 5V DC |
| Power Dissipation (max) | 5.3W @ 31.2V DC |
| Thermal Dissipation (max) | 18.1 BTU/hr @ 31.2V DC |
| Operating Temperature | 0 to 55 C (32 to 131 F) |
| Storage Temperature | -40 to 85 C (-40 to 185 F) |
| Vibration | 5g @ 10 to 500 Hz |
| Operating Shock | 30 g |
| Enclosure | Open-type |
| Mounting | DIN Rail |
| Terminal Base Compatibility | 1794-TB32 and 1794-TB32S |
Industry Applications
Manufacturing Line Control
In automotive assembly lines, the 1794-OB32P controls 24V DC actuators and indicator lamps. Its 32 channels allow dense output configuration, reducing cabinet space. The electronic protection prevents damage from overloads, minimizing downtime.
Material Handling Systems
For conveyor systems, this module drives solenoid valves and motor starters. The sourcing output type simplifies wiring with common positive voltage. The 14.0 A per module rating supports multiple loads simultaneously.
Process Automation
In chemical processing, the module operates alarms and pilot lights. The 0.5ms off-to-on delay ensures fast response. The isolation voltage of 50V protects against ground loops.
Installation & Setup Guidance
Mount the 1794-OB32P on a DIN rail using the open-type enclosure. Use only compatible terminal bases: 1794-TB32 or 1794-TB32S. Wire size is determined by the installed terminal base. Ensure the external DC supply voltage is within 10-31.2V DC, including 5% AC ripple. Connect the Flexbus to the adjacent module for communication. Verify that the total current per group does not exceed 6 A for channels 0...15 and 8 A for channels 16...31. The module draws 80mA @ 5V DC from the Flexbus.
Maintenance & Reliability
Inspect the module periodically for signs of overheating or physical damage. Keep the enclosure free of dust and moisture. The operating temperature range is 0 to 55 C (32 to 131 F). Store the module between -40 to 85 C (-40 to 185 F) when not in use. The module withstands vibration up to 5g @ 10 to 500 Hz and shock up to 30 g. No user-serviceable parts inside; replace the module if faults occur.
Compatibility & Integration
The 1794-OB32P integrates with Rockwell Automation Flex I/O systems. It communicates via the Flexbus, requiring 80mA @ 5V DC. The module works with 1794-TB32 and 1794-TB32S terminal bases. It is compatible with Allen-Bradley programmable logic controllers that support Flex I/O adapters. The sourcing output type suits common positive voltage systems.
Selection Guide & Purchasing Advice
When selecting the 1794-OB32P, verify that your application requires 32 sourcing outputs at 24V DC nominal. Consider the total current per group: 6 A for channels 0...15 and 8 A for channels 16...31. For replacement or new installations, contact SpareTechPLC to confirm availability and lifecycle status. SpareTechPLC offers genuine Allen-Bradley modules with expert support.
Troubleshooting & Common Issues
If outputs fail to energize, check the external DC supply voltage (10-31.2V DC). Verify that the terminal base is properly seated. If an output channel shows no voltage, test with a multimeter at the terminal. The module has individual electronic protection; a sustained overload may trip the channel. Power cycle the module to reset. If the Flexbus LED is off, check the adapter connection. For persistent faults, replace the module.
