The Allen-Bradley 1746-P2 is a chassis-mounted power supply for SLC 500 systems. It provides 5A at 5V DC backplane power, features selectable 120/240V AC input, and includes a 24V DC auxiliary output for field devices.
The Allen-Bradley 1746-P2 functions as a high-capacity power supply module designed specifically for the SLC 500 modular hardware platform. This unit mounts directly to the left side of a 1746 chassis, where it converts external AC input into the regulated DC voltages required by the processor and various I/O modules. By delivering up to 5 Amps at 5V DC, this module provides the necessary current to support complex system configurations with high-density I/O requirements.
Operational flexibility defines the 1746-P2, as it features a user-selectable input voltage range. Consequently, the power supply can operate on either 120V AC or 240V AC nominal inputs, allowing for global deployment across different electrical standards. To ensure system reliability, the hardware incorporates robust internal protection mechanisms, including overvoltage protection and fuse-based short-circuit guarding. These features prevent downstream damage to expensive CPU and communication modules during power surges or field-side faults.
Furthermore, the module includes a dedicated 24V DC auxiliary power output. This secondary output provides a convenient power source for field-side sensors and switches, which effectively eliminates the need for an additional external power brick in smaller control panels. The unit also features a front-facing LED status indicator that provides immediate visual confirmation of DC output health. Because the 1746-P2 utilizes high-quality electrolytic capacitors and a thermal-efficient ventilated housing, it maintains consistent performance even in environments with significant ambient temperature fluctuations.
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