The Allen-Bradley 1746-P2 serves as a primary energy source for the SLC 500 modular hardware platform. This unit mounts directly to the left side of any 1746 chassis. It converts external AC input into regulated DC power for the backplane. Consequently, the module supports the processor and all connected I/O cards. The design occupies a dedicated slot that does not reduce the available I/O count. Therefore, users can maximize their system density without sacrificing power stability.
Furthermore, this power supply handles significant electrical loads in complex automation racks. It provides 5 Amps at 5V DC for internal logic circuits. Additionally, it offers 0.96 Amps at 24V DC for external user devices. This dual-output capability simplifies wiring by eliminating the need for extra external power sources.
Core Technical Specifications
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Model Designation: 1746-P2
- Hardware Category: Rack-Mounted Power Supply
- Input Voltage Range: 85–132V AC or 170–265V AC
- Input Frequency: 47–63 Hz
- Backplane Output (5V DC): 5.0 Amps
- User Output (24V DC): 0.96 Amps
- Isolation Rating: 1800V AC RMS
- Unit Weight: 1.1 kg (approx. 2.5 lbs)
- Dimensions: 15.2 x 10.2 x 15.2 cm
- Operating Temperature: 0°C to 60°C
Advanced Protection and System Hold-Up
The 1746-P2 includes intelligent safeguards to protect sensitive PLC components from line disturbances. It features a built-in 1746-F2 fuse to prevent damage from short circuits. Moreover, the module provides a 20ms hold-up time during full-load conditions. This brief buffer allows the SLC processor to save critical data during minor power dips.
Additionally, the hardware supports different responses to overcurrent events based on its series. Series C units maintain CPU operation even if the 24V user power fails. This logic ensures that the main control program stays active during minor peripheral faults. Consequently, the system avoids unnecessary reboots and improves overall factory uptime.
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