A PLC programmer oversees the programming of various machines functioning on programmable logic controller technology. PLC technology is a digital computer that controls electromagnetic processes, primarily in industrial equipment. As a PLC programmer, you are responsible for the programming and maintenance of these systems. Your duties include developing and programming new machines, reprograming existing machines, and diagnosing and repairing issues with PLC driven systems. You may work in various specialized industries, such as the medical, manufacturing, or agriculture fields. Your job is to create or update computerized machine systems so that the input, output, and control systems function optimally to meet the needs of your employer.