1746-HSTP1 | Allen-Bradley Controller Module

The 1746-HSTP1 is a single-axis high-speed stepper motion controller for use with Allen-Bradley SLC 500 PLCs. It controls a stepper motor directly using step and direction outputs and is designed for precise point-to-point motion in low- to mid-speed automation applications.

• Controls 1 stepper motor axis
• Supports pulse rates up to 250 kHz
• Provides step and direction or quadrature outputs
• Supports absolute and incremental positioning
• Can perform homing, jogging, and indexing
• Uses ladder logic for motion commands

It’s ideal for applications like pick-and-place systems, indexing tables, or feeders.

• Outputs:
  Step (pulse)
  Direction (CW/CCW)
• Inputs:
  Limit switches (home, positive, negative)
  Fault or enable signals

The module provides isolated outputs that connect to a stepper motor driver, which in turn controls the motor. It does not directly drive the motor, only provides command signals.

Programming is done using ladder logic instructions to:

• Set step rates
• Define position targets
• Initiate motion commands (move, home, jog)
• Monitor motion status bits (busy, in-position, fault)

The module's operation is managed through command registers addressed via the I/O data table (e.g., O:1.0/xx, I:1.0/xx).

• No movement: Check pulse wiring to motor driver, verify enable input, ensure motion command issued.
• Unexpected direction: Reverse direction wiring or use logic to invert signal.
• Module not responding: Confirm chassis slot configuration and power cycle system after installation.
• Limit fault: Ensure proper logic for limit switch conditions and reset faults in program.

Use status bits in the module’s input image to diagnose and clear faults.