The Allen-Bradley 1771-M1 Stepper Controller Motor Module is a key component of the 1771-QA Stepper Motor Positioning Assembly, providing advanced programmable control for various stepper motors within a Programmable Controller system. It occupies one slot in the 1771 I/O chassis and can control up to three pulse output expander modules across three axes. The module draws a maximum backplane current of 1.75A. It is designed for durability, operating in temperatures from 5°C to 60°C with 5-95% relative humidity (non-condensing) and can withstand storage temperatures from -40°C to 85°C.