Product Overview
In industrial automation, protecting outputs from short circuits while maintaining high-current capability is critical. The Allen-Bradley 1746-OBP16, a SLC 500 Digital DC Output Module, addresses this need with 16 sourcing channels and integrated fuse protection. Designed for fixed or modular SLC 500 chassis, this module delivers reliable 24 VDC output for demanding applications.
Technical Specifications Breakdown
Key parameters for the 1746-OBP16 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Module Type | Digital DC Output Module |
| Number of Outputs | 16 |
| Voltage Range | 20.4-26.4 Volts DC Source |
| Current per Output | 1.5 or 1 amps |
| Current per Module | 6.4 amps |
| Backplane Current (5 Volts) | 250 milliamps |
| Step Response | 60 milliseconds in, 2.5 milliseconds out |
| Fuse Protection | Yes |
| Compatible Fuse | Littelfuse #322010,10A or #332010,10A |
| Fuse Kit Part Number | 1746-F8 |
| Recommended Signal Wires | Max 2 mm. sq. (14 AWG) |
Industry Applications
This module excels in high-current discrete output applications such as controlling motor starters, solenoid valves, and indicator lights. Its sourcing configuration simplifies wiring in positive-logic systems. The integrated fuse minimizes downtime by protecting against short circuits, making it ideal for continuous production lines where reliability is paramount.
Installation & Setup Guidance
Install the module into any single slot of an SLC 500 fixed or modular chassis. Use signal wires up to 2 mm² (14 AWG) for connections. Ensure the output voltage stays within 20.4-26.4 VDC source. The module automatically resets after correcting a fault and cycling system power. Always verify the chassis backplane current (250 mA at 5 V) does not exceed system limits.
Maintenance & Reliability
Periodically inspect the module for blown fuses. The front-panel E-FEUSE LED indicates a channel short circuit or overload. Replace the fuse only with Littelfuse #322010,10A or #332010,10A, or the Allen-Bradley 1746-F8 fuse kit (5 fuses per kit). Remove the module from the chassis before replacing the fuse. Other channels continue operating during a single-channel fault.
Compatibility & Integration
The 1746-OBP16 is part of the SLC 500 series and integrates seamlessly with SLC 500 processors and I/O modules. It occupies one slot and communicates via the backplane. No additional communication protocols are required beyond standard SLC 500 backplane operation.
Selection Guide & Purchasing Advice
When selecting a digital output module, consider the number of outputs, voltage range, and current requirements. The 1746-OBP16 offers 16 sourcing outputs with 20.4-26.4 VDC and up to 1.5 A per output. For high-current applications, this module provides robust protection. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Troubleshooting & Common Issues
If the E-FEUSE LED illuminates, a channel has experienced a short circuit or overload. Remove system power, correct the fault, and reapply power to reset the module. If the module does not respond, check backplane connection and ensure the chassis supplies adequate 5 V backplane current (250 mA). Always use the specified fuse to maintain UL/CSA ratings.
