Controllers

Controllers execute automation logic and coordinate inputs, outputs and data exchange. The choice between a programmable relay and a PLC depends on process complexity, expansion needs and communication architecture.

Eaton easyE4 and Siemens LOGO! 8 perform compact logic tasks with expansion modules. Eaton XControl and Siemens SIMATIC S7 provide PLC platforms: S7-1200 combines a controller with onboard I/O, while S7-1500 uses a modular architecture for more complex systems. The subcategories address memory, interfaces, expansion and engineering environments. Selection follows the machine sequence, signal count and data exchange; an operator panel adds visualisation to the control system.