Allen-Bradley 1746-P2/C Power Supply Module

The Allen-Bradley 1746-P2/C, also cataloged as the 1746-P2 power supply module, operates as a regulated DC power generation unit for SLC 500 chassis backplane distribution, converting AC line input into stabilized 5 VDC and 24 VDC rails for processor and I/O subsystem execution within the controller architecture.

Hardware Specifications

AC Input Conversion & Backplane Power Distribution (SLC 500 Architecture)

The 1746-P2/C performs AC-to-DC conversion using internal rectification and regulation stages, generating isolated DC rails distributed through the SLC 500 chassis backplane. The 5 VDC rail supplies processor logic and communication circuits, while the 24 VDC rail supports I/O module field interface conditioning.

Switch-selectable input configuration enables operation on 120 VAC or 240 VAC mains, with internal regulation maintaining stable DC output under variable load conditions. Isolation barriers between AC input stage and DC output stage prevent line transients from propagating into backplane electronics.

Thermal load is dissipated through chassis-integrated convection paths, with continuous operation dependent on ambient enclosure temperature and backplane current draw distribution across installed modules.

Frequently Asked Questions (FAQ)

Q: What is the function of the dual output rails in 1746-P2/C?
A: The module provides a 5 VDC rail for processor logic and a 24 VDC rail for I/O module interface circuits within the SLC 500 backplane.

Q: Does the module support both 120 VAC and 240 VAC operation simultaneously?
A: No, input voltage is switch-selected; only one AC input range can be configured at a time.

Q: Is backplane power electrically isolated from AC input?
A: Yes, internal isolation separates AC input circuitry from DC output rails to prevent line disturbances from reaching the backplane.

Field Installation Guidelines

The power supply module must be installed into the designated SLC 500 chassis slot with AC input removed during insertion. Input voltage selector setting must match local mains supply prior to energization.

Proper grounding of the chassis is required to maintain isolation integrity between AC input and backplane DC distribution. Cable routing should separate AC input conductors from low-voltage backplane wiring to reduce coupling effects.

Continuous load should remain within rated 5 VDC and 24 VDC current limits to avoid thermal stress accumulation in the regulator stage.