Question 363Electricity & Electronics - Assistant Engineer

The correct answer is C) programming device. The program that controls the operation of a programmable logic controller (PLC) is developed and used to transfer the program to the memory unit of the PLC through the programming device. The programming device, typically a computer or a dedicated programming unit, is where the PLC program is created, edited, and then downloaded to the PLC's memory. The other components, such as the communications interface, program and data memory, and processor, are responsible for executing the downloaded program and controlling the PLC's operations, but they do not directly participate in the program development and transfer process.