SP-163182  A-B  Control Unit

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 Error 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 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. • 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. • Counter (file 5) - This file stores the counter accumulator and preset values and the status bits. • Control (file 6) - This file stores the length, pointer position, and status bits for specific instructions such as shift registers and sequencers. • Integer (file 7) - This file is used to store numeric values or bit information.

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