The Allen-Bradley 170974 is a discrete adapter board designed to enhance the capabilities of Bulletin 1395 digital DC drives, known for their exceptional performance in a wide range of industrial applications. As part of the Spare Parts series, it provides up to four digital inputs at 120 Volts AC and four additional digital inputs at 24 Volts DC, along with two digital outputs for both AC and DC applications. It also offers robust analog options with four inputs and outputs at ±10 Volts DC, making it a versatile tool for extending system control and monitoring functionalities in demanding environments.