Allen-Bradley 1746-P4 SLC 500 Power Supply Module

Technical Specifications Breakdown

Key parameters for the 1746-P4 are listed below for quick reference:

Industry Applications and Operational ROI

For example, in a bottling plant, the 1746-P4 powers the SLC 500 rack controlling conveyor sequencing. Its 20 ms hold-up time at full load prevents processor shutdown during brief voltage sags, reducing costly line stoppages. In wastewater treatment facilities, the 24VDC output can power external sensors, though it is not recommended for output modules to avoid troubleshooting complexity. By investing in this module, operations minimize unplanned downtime and extend the life of adjacent I/O modules.

Installation and Setup Guidance

Mount the 1746-P4 only in a 1746 chassis. Ensure the input voltage matches your facility supply: 120 to 220 Volts AC at 47 to 63 Hertz. Use the recommended 1746-F1 fuse or equivalent for protection. Connect the power supply to the chassis backplane; modules in the rack will then be recognized by the SLC processor. Do not use the 24VDC output to power output modules, as this complicates troubleshooting—shutting down the supply stops the entire controller rack.

Maintenance and Reliability

Inspect the power supply periodically for dust accumulation on vents and ensure ambient temperature stays within 0 to 60 Celsius. The built-in fuse protection safeguards against overcurrent events. Verify the hold-up time performance during routine system checks: 20 ms at full load and 3000 ms at no load. No disassembly or internal adjustments are required—only external visual inspection and cleaning.

Struggling with Unstable Backplane Power in Your SLC 500 System?

The Allen-Bradley 1746-P4 is engineered to deliver consistent backplane power, ensuring your automation system runs without unexpected downtime. As a dedicated SLC 500 power supply module, it provides the foundation for stable operation in local, expansion, or remote I/O chassis.

Compatibility and Integration

The 1746-P4 is designed exclusively for the Allen-Bradley SLC 500 series. It provides backplane power to local chassis, expansion modules, and remote I/O chassis. The module is UL Listed as Industrial Control Equipment and certified for CSA Certified Process Control Equipment for Class 1, Div 2, Groups A, B, C, D Hazardous Locations.

Selection Guide and Purchasing Advice

When selecting a replacement or spare power supply for your SLC 500 system, verify that the 1746-P4 matches your chassis type and voltage requirements. Please verify current lifecycle status and availability with AutoDCSTech before ordering. This ensures you receive a genuine Allen-Bradley component that meets your operational needs.