Understanding of problem-solving methodologies used in determining root cause and formulating corrective action(s) - i.e., thought maps, 8D, root cause analysis, Process Failure Mode Effect Analysis, control charts, Pareto charts, A3s, etc. A PLC Engineer is responsible for designing, programming, testing, troubleshooting, and maintaining PLC-based control systems, HMIs, test equipment, and electrical automation systems in a manufacturing environment.