Which of the following is NOT typically included in a PLC project file?

In a PLC project file, the primary components include the communication configuration, ladder logic programs, and the hardware configuration associated with the control system. Communication configuration outlines how the PLC communicates with other devices, ladder logic programs define the control logic for operation, and hardware configuration describes the specific hardware setup, such as I/O devices and their arrangements.

Networking hardware, while essential for the functioning of a PLC system, refers to the physical devices (like switches, routers, and cabling) used for connecting different parts of the network. These elements are not typically stored or configured within a PLC project file itself but rather are part of the overall system infrastructure. Therefore, while networking hardware is crucial for ensuring effective communication and operation of the PLC, it is not a component included in the project file that focuses on the software and program elements specific to the PLC's operation.