Controllers & PLCs

The PLC is the brain of a machine or process. It reads inputs from sensors, runs the control logic you've programmed in ladder, function-block or structured text, and switches outputs that drive actuators, motors, valves and indicators. We stock everything from compact micro-PLCs for stand-alone OEM machines (Siemens S7-1200, Mitsubishi FX-series, Allen-Bradley MicroLogix, OMRON CP-series) up to large modular controllers (Siemens S7-1500, Allen-Bradley ControlLogix, ABB AC500) that handle plant-wide control.

For motion-heavy applications — multi-axis CNC, robotics, packaging — a dedicated motion controller or motion CPU is often paired with the PLC to handle deterministic, high-cadence position loops without loading the main scan. Remote I/O extends the controller's reach over a single fieldbus cable, letting you place I/O blocks next to the sensors and actuators they serve instead of running long copper back to a central panel.

Replacement and obsolescence are the two most common reasons customers contact us about controllers. Many older Siemens, Allen-Bradley and Mitsubishi PLCs are still running fine on the factory floor but are no longer manufactured — we maintain stock or sourcing relationships for legacy parts as well as the current generation, and can advise on like-for-like swaps or migration paths.