Smarter PLCs and HMIs now rival SCADA systems

摘要

The traditional boundaries between SCADA-based control systems and PLC-based control systems were, if not fixed, then at least relatively clear, with SCADA typically being the favourite for process applications and PLCs for discrete, sequential control. But as those boundaries have blurred, many users who would previously have considered a SCADA system as their best option might today find they are better served by a compact PLC linked to an HMI.