What device is used to download hardware configurations and programs to a PLC?

The device that is primarily used to download hardware configurations and programs to a Programmable Logic Controller (PLC) is a PC. A personal computer typically runs specific software applications designed for programming PLCs. This software allows users to create, modify, and download the configurations and logic programs necessary for the PLC to function as intended in an industrial automation system.

Using a PC provides a user-friendly interface for programming and debugging, as well as access to a variety of resources and tools that can aid in the development of complex control strategies. The communication between the PC and the PLC can be facilitated through various means such as USB, serial ports, or network connections, depending on the PLC model.

While other options like memory cards, terminal interfaces, and network cables can play roles in configuration and connections, the PC is the most versatile and widely used device specifically for downloading comprehensive hardware configurations and programming directly to PLCs.