Allen-Bradley 1771-A4B 16-Slot I/O Chassis

Description

The Allen-Bradley 1771-A4B 16-Slot I/O Chassis is a universal I/O enclosure belonging to the 1771 programmable logic controller (PLC) product line, designed for industrial automation applications. It features 16 I/O slots and supports panel mounting, with a total weight of 7.3 kg (16 lbs). Key technical specifications include a maximum backplane current of 24A, enabling reliable power distribution to connected modules. The chassis operates in temperatures ranging from 32 to 140 degrees Fahrenheit (0 to 60 degrees Celsius), with a storage temperature range of -40 to 185 degrees Fahrenheit (-40 to 85 degrees Celsius), and tolerates relative humidity of 5-95% without condensation. It is rated for panel vibration of 2g at 10-500 Hz and shock of 15g, suitable for harsh industrial environments. Power options include a built-in 2-4A supply, 3-8A rated power modules, or 6.5-16A external power sources; note that external power and power modules cannot be installed simultaneously to avoid configuration incompatibility. The chassis includes a backplane with electronic circuitry for power distribution, plus hinges for field wiring arms. Compatible 1771 I/O modules are compact, flexible, and cost-effective, featuring wiring arms and remote termination panels for tool-free module replacement, front-facing status indicators for quick diagnostics, and support for easy future expansion via larger chassis upgrades.