This PLC program for temperature control using the thermostat diagram demonstrates the PLC Temperature Control Programming process. There are three Heaters in a vessel used to control the temperature of the vessel. These heaters have different setpoints or temperature ranges where heaters can be turned on. Modern PLCs can be programmed in various ways, including relay-derived ladder logic and programming languages like specially adapted dialects of BASIC and C. Another method is state logic, a very high-level programming language designed to program PLCs using state transition diagrams. PLC software enables machines to repeat tasks to save time, increase efficiency, and reduce errors. A programmable logic controller (PLC) is a piece of industrial equipment specifically designed and installed to manage manufacturing processes.