Installation manual

Publication 1747-RM001G-EN-P - November 2008

E-2 Data File Organization and Addressing

hard to disk, replacing the original disk version with the edited version. The

hard disk is the recommended location for a processor file.

Processor files are created in the offline mode using the programming device.

These files are then restored (downloaded), to the processor for online

operation.

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.

• Subroutine Ladder Program (file 3 to 255) - These files are

user-created and accessed according to subroutine instructions residing

in the main ladder program file.

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. You

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.

Workspace

Hard Disk

Uniquely named

processor files

PROGRAMMING DEVICE