Overview
The Allen-Bradley 1746-P1 SLC 500 power supply is a rack-mounted power module designed to supply regulated DC power to SLC 500 chassis and connected I/O modules. This power supply module is designed for the SLC 500 series and provides essential backplane power for modules in the SLC 500 chassis. The power supply is installed at the leftmost position of an SLC 500 chassis, and whether main, expansion or Remote I/O rack, the installation position is the same. Only one power supply is needed per chassis.
Key Features
- Dual Input Voltage: Line voltage of 85 to 132 Volts or 170 to 265 Volts AC at 47 to 63 Hertz
- High Current Output: Internal current capacity of 2A at 5VDC and 0.46 A at 24VDC
- User Power Supply: 24 Volt DC user-power current capacity of 200 mA and a 24 Volt DC user-power voltage range of 18 to 30 Volts DC
- Built-in Protection: Provides a 24VDC voltage output with built-in fuse protection
- Reliable Hold-up Time: CPU hold time is 20 ms at full load and 3000 ms at no load, allowing graceful shutdown during power dips
Technical Specifications
- Input Voltage Range: 85-132V AC or 170-265V AC
- Input Frequency: 47-63 Hz
- Input Power: 42 Watts
- Typical Power Requirement: 135 VA
- 5VDC Output Current: 2A internal
- 24VDC Output Current: 0.46A internal, 200mA user-supplied
- Output Voltage Range: 18 to 30 Volts DC
- Inrush Current: Maximum 20A
- Isolation: 1800 Volts AC RMS for 1 second
- Overcurrent Protection: Maximum user-supplied overcurrent protection is 15 A
- Operating Temperature: 0 to 60 degrees Celsius, with current capacity derated by 5% when temperature exceeds 55 degrees Celsius
- Dimensions: 5.5 x 2.3 x 5.7 inches
- Weight: 2 pounds or 0.9 kilograms
- Fuse Protection: Equipped with 1746-F1 or equivalent
Typical Applications
The 1746-P1 is used in industrial automation environments requiring SLC 500 controllers, including:
- Manufacturing line control systems
- Process automation and monitoring
- Discrete I/O rack power distribution
- Remote I/O power supplies
- Legacy automation system upgrades and replacements
Compatibility & Replacements
Compatible With
- SLC 500 controller family (all series)
- SLC 500 discrete I/O modules
- SLC 500 analog I/O modules
- 1746 chassis (all variants)
- Main, expansion, and Remote I/O racks
Replaces / Drop-In Replacement For
The 1746-P1 Series A is the standard power supply for SLC 500 systems. For exact cross-references and upgrade paths, verify with your system documentation or contact our technical team, as the 1746-P1 has limited direct replacements within the SLC 500 family.
Works With
- SLC 500 processors (all models)
- Allen-Bradley RSLogix 500 programming software
- DH-485 and DF1 communication protocols
- Standard 24VDC industrial control wiring
- 1746 I/O module ecosystems
