Allen-Bradley 1771-A1B/B PLC-5 4-Slot I/O Chassis Panel-Mount Backplane

Allen-Bradley 1771-A1B/B PLC-5 4-Slot I/O Chassis for Modular Control Systems

The Allen-Bradley 1771-A1B/B is a 4-slot I/O chassis engineered for the PLC-5 family, providing a stable backplane for processors, power supplies, and 1771-series I/O modules. This Series B chassis is designed for panel mounting and supports flexible system configurations in industrial control cabinets.

PLC-5 Backplane and Slot Architecture

• Four-slot backplane with the leftmost slot dedicated to a processor or adapter module
• Supports Allen-Bradley 1771-series discrete, analog, and specialty I/O modules
• Selectable 2-slot, 1-slot, and 1/2-slot addressing via backplane configuration switches
• 5 VDC backplane rated for up to 16 A total current capacity

Power Integration and Mechanical Design

The chassis supports both internally installed power supply modules and side-mounted external power supplies, with a dedicated backplane jumper to configure the power source. Its open-style construction allows efficient cooling when installed with required panel clearances.

Industrial Control Applications

• PLC-5-based industrial automation systems
• Panel-mounted control cabinets and enclosures
• Distributed I/O systems using 1771-series adapters