Allen Bradley 1746-P2 Power Supply Module

Comprehensive Overview

The Allen Bradley 1746-P2 Power Supply Module is a high-performance unit designed specifically for the SLC 500 modular controller family. Built to provide reliable, regulated DC power to SLC processors, input/output (I/O) modules, and communication adapters, the 1746-P2 ensures continuous and stable operation in industrial automation environments.

This module features universal input compatibility and short-circuit protection, supporting both standard and extended chassis configurations. Engineered with industrial-grade durability and thermal management, it remains one of the most dependable power units for legacy control systems still in operation today.

Technical Specifications

Practical Applications

The 1746-P2 is a widely implemented component in manufacturing and process control systems requiring robust and consistent power delivery. Typical applications include:

• Packaging and Conveyor Systems – powering controllers for multi-motor coordination.

• Water Treatment Plants – maintaining continuous logic control and process feedback.

• Material Handling – ensuring stable I/O response for automation networks.

• Assembly Lines – driving logic processors and operator interfaces simultaneously.

• Energy and Utility Monitoring Systems – supporting redundant control infrastructure.

Its modular integration and protective design make it ideal for demanding industrial environments.

Advantages and Performance Benefits

• Dual Voltage Input Flexibility – automatically accommodates 120V or 220V AC without adjustment.

• Reliable Power Regulation – precise DC output for CPU and I/O stability.

• Advanced Protection – internal circuitry guards against overloads, voltage spikes, and heat buildup.

• Compact and Modular – easily mounts into standard 7-slot SLC chassis with minimal space requirements.

• Industrial Durability – designed to operate continuously under harsh ambient conditions.

• Maintenance-Friendly Design – LED status indicators simplify troubleshooting.

• Low Ripple Voltage – ensures consistent analog signal performance.

• Compatibility – works seamlessly with all SLC 500 processors including 1747-L541, L542, and L543.

Engineering FAQs

1. What chassis types are compatible with the 1746-P2?
   It supports the 7-slot chassis (1746-A7) and remote chassis configurations.

2. Can it operate in dual-voltage environments?
   Yes, it automatically detects and adjusts for 120V or 220V AC input.

3. What happens if the 5V DC output exceeds the rated load?
   The power supply will shut down temporarily to prevent damage and restart after the overload is cleared.

4. Is there a built-in surge or transient protection circuit?
   Yes, the module includes surge suppression to protect against input line disturbances.

5. Does it require external fuses?
   No, it contains internal protective circuitry eliminating the need for external fusing.

6. What is the total output capacity in watts?
   Approximately 60 watts combined from 5V and 24V DC outputs.

7. Can this power supply be used in a redundant configuration?
   While not inherently redundant, dual supplies can be configured in parallel for backup power.

8. How can you monitor the supply’s health?
   Front-panel LED indicators display operational and fault conditions.

9. Is there an isolated 24V DC output?
   Yes, the 24V DC output is isolated and ideal for powering sensors or transducers.

10. Can it power extended remote racks?
    Yes, with the addition of 1747-ASB modules for remote communication.

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