Allen-Bradley 1756-PSCA2 ControlLogix Redundant Power Supply Chassis Adapter Module

Product Overview

The Allen-Bradley 1756-PSCA2 acts as the central hub for ControlLogix redundant power systems. This passive chassis adapter module mounts directly into the power slot of a 1756 ControlLogix rack. It accepts inputs from redundant 1756-PA75R or 1756-PB75R power supplies via 1756-CPR2 cables and distributes regulated power to the chassis backplane. This module eliminates the need for active components in the power path, increasing system reliability by reducing potential failure points. We supply this item as a 100% Brand New, factory-sealed unit.

Technical Specifications

Engineering Advantages

Passive Architecture for Maximum Uptime
The 1756-PSCA2 utilizes a passive design that requires no internal firmware or active switching logic. This architecture prevents software crashes within the power module itself. The module simply routes power from the active supply to the backplane. If the primary supply fails, the secondary supply takes over instantly through the CPR2 cables, ensuring zero interruption to your PLC processor or I/O modules.

High-Current Distribution
This adapter handles significant loads, delivering up to 15 Amps at 5.1V DC and 2.8 Amps at 24V DC. This capacity supports densely populated ControlLogix chassis containing high-power communication modules and analog I/O cards. The module maintains stable voltage levels even under peak load conditions, preventing brownouts that could corrupt data.

Ruggedized for Industrial Environments
The 1756-PSCA2 withstands harsh operating conditions. It operates reliably in temperatures ranging from 0°C to 60°C and survives storage temperatures as low as -40°C. The module resists vibration up to 2 G and shock up to 30 G during operation, making it suitable for heavy industrial applications like mining, automotive assembly, and oil & gas platforms.

FAQs

Q: Do I need to configure the 1756-PSCA2 in RSLogix 5000?
A: No. The 1756-PSCA2 is a passive hardware device. It requires no configuration, no Electronic Data Sheet (EDS) file, and no slot configuration in the software. You simply install it in the power slot and connect the redundant cables.

Q: What cables do I need to connect the power supplies to this adapter?
A: You must use the 1756-CPR2 redundant power cables. These specialized cables connect the redundant power supplies (mounted in the chassis slots) to the input connectors on the 1756-PSCA2 module.

Q: Can I use the 1756-PSCA2 with standard non-redundant power supplies?
A: This module is specifically designed for redundant architectures. While it physically fits the chassis, using it with standard non-redundant supplies (like the 1756-PA75) offers no benefit. It is intended for use with 1756-PA75R or 1756-PB75R units to create a fully redundant system.