Based on the results of the program scan, the PLC updates the status of the output devices. This could mean turning on a motor, actuating a hydraulic valve, or triggering an alarm light.
Visual "blocks" of functions connected together. programmable logic controllers principles and applications
The principles of Programmable Logic Controllers—ruggedness, reliability, and real-time logic—have remained constant, even as their applications have expanded into the digital frontier. As industries continue to seek greater efficiency and connectivity, the PLC will remain the foundational technology driving the world's machines. Based on the results of the program scan,