Programming Overview
4–5
Program Files
Program files contain controller information, the main ladder program, interrupt
subroutines, and any subroutine programs. These files are:
• System Program (file 0) – This file contains various system related
information and user-programmed information such as processor type, I/O
configuration, processor file name, and password.
• Reserved (file 1) – This file is reserved.
• Main Ladder Program (file 2) – This file contains user-programmed
instructions defining how the controller is to operate.
•
User Err
or Fault Routine (file 3) – This file is executed when a recoverable
fault occurs.
• High-Speed Counter Interrupt (file 4) – This file is executed when an HSC
interrupt occurs. It can also be used for a subroutine ladder program.
• Selectable Timed Interrupt (file 5) – This file is executed when an STI occurs.
It can also be used for a subroutine ladder program.
• Subroutine Ladder Program (files 6 – 15) – These are used according to
subroutine instructions residing in the main ladder program file or other
subroutine files.
Data Files
Data files contain the status information associated with external I/O and all other
instructions you use in your main and subroutine ladder program files. In addition,
these files store information concerning processor operation. Y
ou can also use the
files to store “recipes” and look-up tables if needed.
These files are organized by the type of data they contain. The data file types are:
• Output (file 0) – This file stores the state of the output terminals for the
controller.
• Input (file 1) – This file stores the status of the input terminals for the
controller.
• Status (file 2) – This file stores controller operation information. This file is
useful for troubleshooting controller and program operation.
• Bit (file 3) – This file is used for internal relay logic storage.
• Timer (file 4) – This file stores the timer accumulator and preset values and
status bits.
Programming
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