Program files in the processor memory are identified by file numbers in what range, and which files are automatically created?

• A. 0-1; files 0-1 automatically created
• B. 0-2; files 0-2 automatically created
• C. 1-3; files 1-3 automatically created
• D. 2-4; files 2-4 automatically created

Answer: (B)

In PLC programming, code is stored in program files identified by specific file numbers, so the system always knows where to find each part of the logic. The processor reserves a small, fixed set of program files and creates them automatically on startup. For this setup, the valid program-file numbers are 0, 1, and 2. The processor automatically creates these three files, providing a ready place for the main program (in file 0) and space for additional logic or subroutines in files 1 and 2.