Product Overview
The Allen-Bradley 1746-P4 is a robust SLC 500 power supply module engineered to deliver reliable backplane power for local, expansion, or remote I/O chassis. As an integral component of the SLC 500 family, the 1746-P4 ensures that attached modules become operational and are recognized by the SLC processor. This industrial automation module is designed for demanding control environments where consistent power is critical.
With a nominal input voltage of 85–132/170–250VAC and a frequency range of 47–63 Hz, the 1746-P4 adapts to global power standards. It provides a stable 24VDC output for external devices, though it is not recommended to power output modules from this supply to simplify troubleshooting. The built-in fuse protection (1746-F1 or equivalent) safeguards the module and your system.
Technical Specifications
Below are the key parameters for the Allen-Bradley 1746-P4, ensuring you have accurate data for system design and integration.
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1746-P4 |
| Series |
SLC 500 |
| Module Type |
Power Supply |
| Input Voltage |
120 to 220 Volts AC |
| Input Power |
92 Watts |
| Typical Line Power Requirement |
180 VA |
| Inrush Current |
45 Amps |
| Backplane Current (5 Volts) |
10 Amps |
| Internal Current Capacity |
10.0 A at 5V dc / 2.88 A at 24V dc |
| Output Voltage Range |
18 to 30 Volts DC |
| CPU Hold-up Time |
20 ms (full load) / 3000 ms (no load) |
| Backplane Current (24 Volts) |
0.46 Amps |
| Weight |
2.5 pounds (1.1 kilograms) |
| Frequency |
47 to 63 Hertz |
| Location |
1746 Chassis |
| Dimensions |
5.5 x 4.3 x 5.7 inches |
| Operating Temperature |
0 to 60 Celsius |
| Fuse Protection |
1746-F1 or equivalent |
Key Benefits & Applications
The 1746-P4 excels in providing uninterrupted power to SLC 500 systems, ensuring minimal downtime. Its hold-up time of 20 ms at full load and 3000 ms at no load allows the processor to continue logic execution during brief voltage sags, preventing costly process interruptions.
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Manufacturing Lines: Maintains control system integrity during power fluctuations, reducing scrap and rework.
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Process Control: Supports continuous operations in chemical or food processing plants where consistent backplane power is essential.
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Remote I/O Applications: Powers remote chassis reliably, enabling distributed control architectures.
This industrial automation module is UL Listed as Industrial Control Equipment and CSA Certified for Class 1, Div 2, Groups A, B, C, D hazardous locations, making it suitable for diverse industrial settings.
Installation & Setup Guidance
Installing the 1746-P4 is straightforward. Mount the module into any slot of a 1746 chassis, ensuring proper seating and locking. Connect the AC input to the designated terminals, observing the voltage range (120–220VAC). For the 24VDC output, use appropriate wiring to power external devices, but avoid using it to power output modules to prevent troubleshooting complexity.
Always verify that the chassis backplane is clean and free of debris before insertion. Secure all wiring to prevent accidental disconnection, and confirm that the power supply’s fuse (1746-F1 or equivalent) is correctly rated.
Maintenance & Reliability
Routine inspection of the 1746-P4 is minimal but essential. Periodically check the input voltage levels and ensure the ambient temperature remains within 0–60°C. Inspect the fuse for signs of wear or damage, and replace it with the specified 1746-F1 or equivalent. Keep the module free of dust and moisture to extend its service life.
By adhering to these simple maintenance steps, you can maximize the reliability of the 1746-P4 and avoid unexpected downtime, contributing to lower total cost of ownership.
Compatibility & Integration
The 1746-P4 is designed exclusively for the SLC 500 family, fitting into any 1746 chassis. It works seamlessly with SLC 500 processors and I/O modules, providing the necessary backplane power for system operation. Ensure that your chassis has available slots and that the total backplane current does not exceed the supply’s capacity (10A at 5V, 0.46A at 24V).
Selection Guide & Purchasing Advice
Before purchasing, verify that your system requires a 1746-P4 power supply and that your chassis model is compatible. Confirm the input voltage available at your facility matches the module’s range (120–220VAC). Also, check that the internal current capacity meets your system’s backplane demands.
When sourcing this component, trust PLC Source PRO for genuine, tested Allen-Bradley 1746-P4 modules. We ensure reliable supply and competitive pricing for your industrial automation needs.