Product number 1771-A4B is a universal I/O (input / output) chassis. This I/O chassis was designed and produced by the company known as Allen Bradley / Rockwell Automation. This product belongs to the Bulletin 1771 series of products. The Allen Bradley 1771-A4B universal I/O chassis has a total of sixteen (16) slots. Additionally, it has a maximum backplane current of twenty-four (24) amperes at five (5) volts direct current (DC). This chassis is capable of being mounted via a panel mount. This Allen Bradley universal I/O chassis has physical dimensions that measure 610 millimeters x 315 millimeters x 193 millimeters, or the equivalent of 24.0 inches x 12.4 inches x 7.6 inches (width x height x depth). Additionally, it has an approximate weight of 7.3 kilograms, or the equivalent of around sixteen (16) pounds. This chassis does not have an enclosure. Therefore, this device is considered an open style device that must be place inside of an enclosure that is designed specifically to protect the I/O chassis from various environmental factors. 

The Allen Bradley 1771-A4B universal I/O chassis should be operated within an environment where the temperature ranges from 0 degrees Celsius to 60 degrees Celsius, or the equivalent temperature range of 32 degrees Fahrenheit to 140 degrees Fahrenheit. Also, when this I/O chassis is not being operated, or is being stored, the temperature of the surrounding environment must range from -40 degrees Celsius to 85 degrees Celsius, or -40 degrees Fahrenheit to 185 degrees Fahrenheit. The relative humidity levels suitable for this device must range from 5 percent to 95 percent and must be non-condensing. This Allen Bradley I/O chassis can withstand an operating shock rated at 15 G, as well as a non-operating shock rated at 30 G. Additionally, this device can withstand a vibration rated at 2 G at a frequency range of 10 to 500 hertz.