1771-A4B

Overview of Allen-Bradley 1771-A4B Universal I/O Chassis

The Allen-Bradley 1771-A4B is a universal I/O chassis designed to provide a versatile housing and backplane connectivity for 1771 PLC modules. This chassis features 16 I/O slots and supports a backplane current of 24 Amperes at 5 Volts DC. It is designed for panel installation and is compatible with various PLC-5 modules, enabling flexible system expansion and configuration.

Key Features of 1771-A4B

• Sixteen (16) I/O slots for flexible module installation.
• Supports a maximum backplane current of 24 Amperes at 5 V DC.
• Designed for panel mounting using back-panel installation.
• Open-style enclosure providing ease of access and cooling.
• Operating temperature range of 0 to 60 °C (32 to 140 °F).
• Non-operating temperature range: -40 to 85 °C (-40 to 185 °F).
• Designed to withstand industrial vibration (2 g at 10-500 Hz) and shock (15 g operating, 30 g non-operating).
• Compatible with wiring arms and remote termination panels for easy wiring and maintenance.
• Allows for future expansion with easy replacement or upgrade options.
• Weight approximately 14.8 lbs (7.7 kg).

Technical Specifications

Applications / Use Cases

The 1771-A4B chassis is ideal for housing PLC-5 series I/O modules in industrial automation systems. It supports diverse applications, including manufacturing control, process automation, and remote I/O expansions, providing reliable and flexible integration of digital and analog I/O modules.