The Allen-Bradley 1771-A2B is a robust I/O chassis designed for the 1771 PLC-5 system, supporting up to 8 I/O modules with seamless communication via its integrated backplane. This versatile chassis facilitates efficient installation through a universal back-panel mounting system, while its compact dimensions of 12.4 x 14.0 x 7.6 inches and weight of 10.3 lbs ensure space-saving deployment in industrial settings. Engineered for reliability, the 1771-A2B operates within a broad environmental range, offering a power supply capacity of 8A at 5V DC, and is equipped with status indicators for intuitive troubleshooting, making it ideal for a wide array of applications demanding digital, analog, and intelligent I/O capabilities.