Allen-Bradley 1746-HSTP1 PLC Module

The Allen-Bradley 1746-HSTP1 is a single-axis stepper controller module designed for the SLC 500 family. This motion module is a plug-in device that provides one axis of stepper motor control within a 1746 backplane rack, translating PLC-issued step and direction commands into motion for a connected stepper motor through a compatible driver. Catalog number 1746-HSTP1 identifies the unit, and Rockwell Automation documents it as the SLC 500 “1 Axis Stepper Module,” confirming its role within the AB SLC 500 ecosystem. In practice, the module is used to execute precise, one-axis stepping moves under program control, making it a common option for straightforward positioning and indexing tasks in AB-based automation setups. Industry literature and third-party replacement notes reference the 1746-HSTP1 as a discrete motion module with a direct replacement option, such as AMCI’s 3501-HSTP1, underscoring ongoing compatibility within legacy SLC‑based systems. The 1746-HSTP1 integrates with the PLC program to manage motor movement while an external motor driver and power stage handle the actual actuation, aligning with the typical installation pattern of AB motion modules in a single-slot, backplane-based configuration.