Allen-Bradley 1771-A4B is a general purpose I/O enclosure.

The Allen-Bradley 1771-A4B is a general purpose I/O chassis.

The hardware is a sixteen (16) slot chassis designed to provide backplane connections and to accommodate 1771 PLC modules.

It provides a maximum backplane current of 24 A and is designed for panel mounting. It has a total weight of 7.3 kg or 16 lbs.

About the 1771-A4B

The Allen-Bradley 1771-A4B is a general purpose I/O chassis that is part of the 1771 Programmable Logic Controller (PLC) product family.

The chassis has sixteen (16) I/O slots that contain electronic circuitry, specifically the backplane, which distributes power to the connected modules.

It is also equipped with hinges for field wiring arms.

The 1771-A4B has an operating temperature range of 32-140 degrees Fahrenheit or 0-60 degrees Celsius.

Hardware storage temperature is -40 to 185 degrees Fahrenheit or -40 to 85 degrees Celsius.

Relative humidity is 5-95% non-condensing. When installing this general purpose I/O chassis, panel vibration and shock should be kept within 2g and 15g at 10-500 Hz, respectively.

The 1771-A4B receives power from the 1771 processor and has an internal power supply that provides 2-4 amps,

The built-in power supply provides 2-4 amp, 3-8 amp rated output power modules, and an external power supply with 6.5-16 amp output current.

In general, do not install external power supplies and power supply modules on the 1771-A4B. Such power connections are incompatible and will result in a substandard hardware configuration.

The 1771-A4B chassis has 16 I/O slots. It measures 12.4 x 24 x 7.6 inches and weighs 14.8 pounds.

When installed in a 1771 PLC-5 system, it utilizes the backplane mounting method with adequate spacing and an open enclosure.

The backplane of the enclosure has a DC voltage of 5 volts and a current of 8 amps.