Advanced Process Control Systems to Cut Variation, Scrap and Rework

The three commonly recognized types are open-loop, closed-loop, and advanced process control systems. Open-loop control follows preset actions without feedback. Closed-loop control measures an output and automatically adjusts a process variable to maintain a setpoint. Advanced Process Control (APC) builds on closed-loop control by using models, multiple inputs, optimization logic, and real-time data to manage more complex production conditions.

Statistical Process Control (SPC) uses statistical tools, such as control charts, to monitor variation and signal when a process may be drifting out of control. Advanced Process Control (APC) uses process data, control models, sensors, and automation to actively adjust operations. SPC helps teams understand variation; APC helps systems respond to it. Many manufacturers use both for stronger quality management and continuous improvement.

Examples include PLC-based temperature control for ovens, pressure and flow controls in material dispensing, robotic weld-path correction using vision, conveyor synchronization, automated torque verification, and SCADA systems that monitor production parameters. In APC applications, connected data and logic can optimize multiple variables together, such as robot speed, material flow, part position, cycle time, and inspection results.

An APC system improves quality by monitoring critical inputs and outputs continuously, detecting variation early, and applying corrective adjustments or alerts before defects multiply. Machine vision can verify component placement, bead integrity, or part orientation, while connected controls record process parameters for traceability. This reduces reliance on end-of-line inspection alone and helps prevent scrap, rework, missed operations, and inconsistent results.

Yes. APC capabilities can often be added during a production-line retrofit or modernization project. The work may include evaluating existing PLCs, sensors, robots, safety systems, machine interfaces, and data availability; then integrating upgraded controls, vision, connectivity, or monitoring tools. GLOBAL assesses facility constraints and production requirements first to identify improvements that minimize downtime and align with planned changeovers or capacity expansions.

A productive APC assessment starts with process goals, quality concerns, production volumes, cycle-time targets, equipment details, available sensor data, floor-space constraints, and maintenance requirements. Teams should also identify critical process variables, recurring defects, current manual checks, and required traceability. GLOBAL can perform workflow and cycle-time analysis to define system scope, integration needs, implementation timing, capital requirements, and expected return.

Implementation timing depends on the process complexity, equipment interfaces, safety requirements, data architecture, and whether the project is a retrofit or a new line. A typical program includes study, design, simulation, controls development, build, testing, installation, commissioning, and training. Up-front simulation and pre-deployment optimization help identify integration issues earlier, supporting faster startup and fewer production-launch surprises.

Yes. APC-connected equipment data can support predictive maintenance by tracking operating conditions, performance trends, alarms, and indicators of emerging equipment issues. GLOBAL uses predictive maintenance tools to help flag concerns before they lead to unplanned downtime. The strongest programs pair this insight with defined maintenance actions, clear ownership, and a reliable data collection strategy across relevant production assets.