The Allen-Bradley 1771-QB Linear Positioning Module is a dual‑loop, single‑slot position controller for the PLC‑5 1771 Universal I/O chassis. It drives servo valves, proportional hydraulic valves, or certain electric servos to control linear motion, with position measured by a linear displacement transducer and used to monitor one or two axes along a tool or workpiece. The module occupies one slot in a 1771 rack and enables closed‑loop positioning within PLC‑5 systems, delivering precise linear positioning for automated machinery.
