Master PLC Scan Cycles: Avoid Logic Conflicts & Race Issues

PLCs execute their programs in scan cycles, where the entire ladder program is scanned repeatedly (cyclically). Beginners may not fully understand the implications of this cyclic nature, leading to logic conflicts, race conditions, or undesired outputs. There are four essential parts to a PLC scan cycle. Read inputs, execute logic (program), diagnostics and communication, and update outputs. Since outputs are generally set only once per scan, the last ladder logic scanned will be the one that sets an output if the logic is duplicated. Ladder logic is a programming language used in PLCs, and it is based on the graphical representation of electrical relay logic circuits. Many beginners struggle with ladder logic because it requires a different mindset than traditional programming languages like C++, Python, or Java. More information can be obtained at our Website. This includes all of the links mentioned in this video. https://accautomation.ca/top-7-problems-with-beginners-using-ladder-logic/ Previously in this PLC Learning Series: PLC Training Series - Tutorial for Everyone https://accautomation.ca/plc-training-series-tutorial-for-everyone/ https://youtu.be/9TpW32gw2Kg What are Inputs? https://accautomation.ca/plc-learning-series-what-are-inputs/ https://youtu.be/d-eB41XV5Qo What are Outputs? https://accautomation.ca/plc-learning-series-what-are-outputs/ https://youtu.be/AjgQcO9IrDU Memory Backup https://accautomation.ca/plc-learning-series-memory-backup/ https://youtu.be/yWng5GHWZWc