Allen-Bradley 1746-P1 SLC 500 Power Supply Module

The Allen-Bradley 1746-P1, also cataloged as the 1746-P1 Power Supply Module, operates as a dedicated hardware component for power distribution within SLC 500 platforms.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks and Base Integration

The Allen-Bradley 1746-P1 supplies the necessary electrical baseline for SLC 500 chassis processing nodes interfacing with Profinet / EtherNet/IP deterministic networks. By regulating raw alternating current inputs down to isolated 5 VDC and 24 VDC rails, the hardware establishes the voltage stability required for processor execution and backplane bus communications. This controlled regulation prevents localized logic dropouts or communication timing jitter caused by external industrial line voltage fluctuations.

Frequently Asked Questions

Q: What are the primary loading restrictions when operating the 1746-P1 near its upper thermal bounds?

A: Between 0 deg C and 55 deg C, the module delivers its full rated output current. When ambient operating temperatures exceed 55 deg C up to the maximum limit of 60 deg C, the available output current capacity must be derated by 5% to prevent thermal overload.

Q: Is this power supply module capable of supporting hot-swapping or on-line replacement?

A: No. Power to the line input terminals must be entirely isolated before installing, removing, or servicing the power supply module. Extracting the unit while energized will interrupt the backplane bus logic and can induce high-voltage arcing across the chassis contacts.

Field Installation Guidelines

• Chassis Alignment: Slide the power supply module into the leftmost position of the 1746 mounting chassis. Ensure the structural guides engage fully and tighten the retaining screws to guarantee continuous transformer grounding.
• Line Voltage Configuration: Verify that the incoming line voltage matches the specified ranges (85-132 VAC or 170-265 VAC). Wire terminal connections securely using the appropriate torque values to prevent high-resistance contact points.
• Conductor Separation: Maintain physical isolation between the incoming AC line wires and low-voltage DC I/O or communication cables to minimize capacitive coupling and high-frequency noise injection.
• Overcurrent Protection Integration: Install a user-supplied external overcurrent protection device rated at a maximum of 15 A on the incoming power line to supplement the internal 1746-F1 fuse assembly.